Answer:
A Muscle Contraction Is Triggered When an Action Potential Travels Along the Nerves to the Muscles.Muscle contraction begins when the nervous system generates a signal. The signal, an impulse called an action potential, travels through a type of nerve cell called a motor neuron. The neuromuscular junction is the name of the place where the motor neuron reaches a muscle cell. Skeletal muscle tissue is composed of cells called muscle fibers. When the nervous system signal reaches the neuromuscular junction a chemical message is released by the motor neuron. The chemical message, a neurotransmitter called acetylcholine, binds to receptors on the outside of the muscle fiber. That starts a chemical reaction within the muscle.Acetylcholine Is Released and Binds to Receptors on the Muscle Membrane.
A multistep molecular process within the muscle fiber begins when acetylcholine binds to receptors on the muscle fiber membrane. The proteins inside muscle fibers are organized into long chains that can interact with each other, reorganizing to shorten and relax. When acetylcholine reaches receptors on the membranes of muscle fibers, membrane channels open and the process that contracts a relaxed muscle fibers begins:
Open channels allow an influx of sodium ions into the cytoplasm of the muscle fiber.
The sodium influx also sends a message within the muscle fiber to trigger the release of stored calcium ions.
The calcium ions diffuse into the muscle fiber.
The relationship between the chains of proteins within the muscle cells changes, leading to the contraction.
Explanation:
Sry I don’t know how to explain It’s a lot.
What is the impact of developing and using rock, mineral, and energy resources on earth's living and non living systems
Answer: The use of rock, mining and energy production contaminates the environment by affecting the abiotic land mass. And therefore, by contaminating the habitat, the living beings that live there are harmed.
Explanation:
Mineral and rock extraction, transport and processing comprise actions that produce environmental impacts because it produces a certain disturbance to the surface and underlying strata, as well as to aquifers. These impacts can be short-lived, lasting as long as the mine is operational, or they can persist after mine development has been completed.
Major impacts include:
Contamination of soil, vegetation, drainages, rivers and groundwater aquifers contamination from leaking tailing piles and slurry ponds. If not properly treated, effluent from surface or subway mine water disposal can be highly acidic, and will contaminate surface waters and shallow groundwater with heavy metals, nitrates or oil from equipment, reducing local water supplies. During surface mining, movement and stockpiling of overburden, constructions or covering of soils alter rivers, drainages and coastal areas. Surface disturbance caused by access roads, pits, and site preparation.Noise and emissions from the operation of equipment.Air pollution, atmospheric dust from traffic, excavation, drilling and site clearing. Atmospheric particulates come from blasting, excavation and earth moving, transportation or any operations that occur on the surface of subway mines.Removal of rock strata can disrupt the continuity of the local aquifer, and cause interconnections and contamination between groundwater.Both surface and subway mining include a drainage of the mine area and discharge of mine water, the removal and storage/disposal of large volumes of waste and the transfer and processing of minerals or construction materials. This requires the use of diesel or electric mining and haulage equipment. Transportation of ore within the mine area and to processing facilities may use trucks, conveyors, rail, polyduct or conveyor belt which are vehicles that emit large amounts of carbon dioxide.
Processing plants may be located in mountainous regions and so may have difficulty disposing of production wastes and other pollutants. They may then end up disposing of them in rivers or coastal waters.
The land at the surface of the mines will be unstable, there will be fracturing and subsidence, it will modificate soils, vegetation, rivers, wildlife habitat, wetlands, causing a temporary or permanent loss of land productivity, and contamination of soils due to mineral materials and toxic substances.
Also, the production and use of energy is the main cause, together with transportation, of greenhouse gas emissions, the gases responsible for climate change. Consequences of climate change are increased temperatures, rising sea levels and reduced rainfall.
The current model of generation, transport and consumption, absolutely dependent on fossil fuels, is unsustainable. The chemical products emitted, mainly from coal and oil-derived thermal power plants, are transported by the wind and deposited by rainfall thousands of kilometers away from their origin, causing "acid rain", which is the cause of the deterioration and destruction of forests, lakes and other ecosystems. Another example are the Nuclear power plants which produce high-level radioactive waste (long-lived, highly radioactive), which poses a constant threat to the environment due to the current inability to manage it.
Thus, the use of rock, mining and energy production contaminates the environment by affecting the abiotic land mass. And therefore, by contaminating the habitat, the living beings that live there are harmed.
The impact of developing and using rock, mineral, and energy resources will be:
loss of biodiversity, soil erosion, and contamination of surface water, groundwater, and soil.
Impact of Minerals:They help us to develop new technologies and are used in our everyday lives. Our use of rocks and minerals includes as building material, cosmetics, cars, roads, and appliances. In order maintain a healthy lifestyle and strengthen the body, humans need to consume minerals daily. Soil, rocks, and minerals provide essential metals and other materials for agriculture, manufacturing, and building.
Find more information about Minerals here:
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Different species often have structures that are used differently but are very
similar in form. Which of the following hypotheses is supported by this
evidence?
HELP PLEASE
Answer:i think its d
Explanation:
Look at the diagram.
Which two structures are first to combine in translation?
20004
• 1 and 2
• 3 and 4
• 2 and 3
• 1 and 4
Answer:
2 and 3
Explanation:
which are the tRNA with anticodons and the amino acids
A significant shift in the environmental conditions over a very short period of time caused most groups of dinosaurs to become extinct because of their inability to adapt fast enough. This allowed for a variety of niches to open providing current organisms new opportunities. Mammals were one group of organisms that took advantage of this environmental change, filling niches that were unoccupied and eventually developing new species that were specifically adapted to their particular environment. Which of the following is a term that most correctly describes this process?
A. Adaptive radiation
B. Gradualism
C. Convergent evolution
D. Genetic drift
Answer:
A. Adaptive radiation
Explanation:
What are the characteristics of sodium?
Answer:
it is a soft metal
it react In a low melting point with a relative density
it is luster
it is of silver and white colour
it have ductility
An increase in heart rate (your heart pumps faster) results in...
Answer:adreninal rushes after doing workouts
Explanation:
Explanation:
it can mean that your are running or moving around or that you are having adrenaline rush or just did cocain or so other drug
6. What is the complementary messenger-RNA sequence for the DNA sequence shown below?
(Helpful hints: RNA has U not T. Under the C, write a G, Under G write a C, under A write U, under the T write an A for adenine.
Portion of DNA: CAC ATT - write the complementary mRNA sequence below
Portion of mRNA:
Match the following vocabulary words. 1.ciliary musclesA transparent liquid which is located between the cornea and iris. 2.optic nerveMuscles attached to the lens to change its shape 3.coneA photoreceptor cell which functions best in bright light. It detects color. 4.vitreous humorThe transparent portion of the sclera at the front of the eye 5.retinaA special part of the choroid layer composed of colorful tissue 6.rodThe nerve connecting the eye to the brain 7.aqueous humorSpecialized cells located in the retina that receive light images 8.scleraA delicate light-sensitive membrane covering the inside of the eyeball 9.irisA photoreceptor cell which is sensitive to dim light, but detects no color10.corneaA fibrous material surrounding the eye to give it shape11.photoreceptorA transparent jellylike substance filling the eyeball
Answer:
1. Aqueous humor.
2. Ciliary muscles.
3. Cone.
4. Cornea.
5. Iris.
6. Optic nerve.
7. Photoreceptor.
8. Retina.
9. Rod.
10. Sclera.
11. Vitreous humor.
Explanation:
A sensory system can be defined as components of the central nervous system (CNS) which comprises of the brain, neural tissues or pathways and sensory neurons responsible for sensory functions, perception and processing sensory informations such as sound, light, heat, etc.
Basically, the central nervous system (CNS) interprete the neural signals that are generated from stimuli that are detected by the sensory system. The five (5) main sense organs in the sensory system are: skin, tongue, ears, nose and the eyes.
An eye can be defined as a specialized organ of sight with the capability to receive visual images that are subsequently transduced into neural signals and relayed to the brain for processing and interpretation. Some of the components of the human eye matched with their description are;
1. Aqueous humor: a transparent liquid which is located between the cornea and iris.
2. Ciliary muscles: muscles attached to the lens to change its shape.
3. Cone: a photoreceptor cell which functions best in bright light. It detects color.
4. Cornea: the transparent portion of the sclera at the front of the eye.
5. Iris: a special part of the choroid layer composed of colorful tissue.
6. Optic nerve: the nerve connecting the eye to the brain.
7. Photoreceptor: specialized cells located in the retina that receive light images.
8. Retina: a delicate light-sensitive membrane covering the inside of the eyeball.
9. Rod: a photoreceptor cell which is sensitive to dim light, but detects no color.
10. Sclera: a fibrous material surrounding the eye to give it shape.
11. Vitreous humor: a transparent jellylike substance filling the eyeball.
Answer:
1. A transparent liquid which is located between the cornea and iris - aqueous humor
2. Muscles attached to the lens to change its shape - ciliary muscles
3. A photoreceptor cell which functions best in bright light, it detects color - cone
4. The transparent portion of the sclera at the front of the eye - cornea
5. A special part of the choroid layer composed of colorful tissue - iris
6. The nerve connecting the eye to the brain - optic nerve
7. Specialized cells located in the retina that receive light images - photoreceptor
8. A delicate light-sensitive membrane covering the inside of the eyeball - retina
9. A photoreceptor cell which is sensitive to dim light, but detects no color - rod
10. A fibrous material surrounding the eye to give it shape - sclera
11. A transparent jellylike substance filling the eyeball - vitreous humor
31. Which sequence shows increasing ecological
levels of organization?
A. organism, population, community, ecosystem
B. ecosystem, population, organism, community
C. community, ecosystem, population, organism
D. population, organism, ecosystem, community
Hello there, kawissaehsshen!!!
The answer here would be A. The organism is a singular thing, so it should be first. The population comes next - it is all the same type of organism living in one ecosystem. Next is community - this is all the living organisms in the area. Lastly, there is the ecosystem - the organisms, their habitats, and everything else.
I really hope this helps you!!
pls help i am failing
methionine
lysine
phenylalanine
leucine
alanine
glycine
Can someone help me
Any substance that is acted upon by an enzyme is called:
A. Coenzyme
B. Vitamin
C. Substrate
D. Polypeptide
Answer:
C. Substrate
Explanation:
this should be the right answer :)
Due to sun damage, a skin cell acquired a mutation in DNA sequence in a gene essential for cell survival. This mutation, however, was not passed on to the offspring of the organism. Which explanation best accounts for this observation?
Answer:
Only mutations in reproductive cells can be passed from parents to offspring.
Explanation:
Due to its location, Hawaii does not have very many land birds. The Hawaiian honeycreepers are a favorite for many ornithologists. There are over 50 species of honeycreepers that can all be traced back to one ancestor. The level of diversity in an ecosystem can be determined by the frequency of speciation and extinction.
a) Describe speciation and identify two possible prezygotic barriers of the Hawaiian honeycreepers that contribute to speciation.
b) If the Hawaiian honeycreepers became extinct, explain how the newly available niches could lead to speciation.
Answer:
In speciation, organisms evolved with the passage of time.
Explanation:
Speciation is the evolutionary process in which populations of species evolve with the passage of time to become different species from the original one. Temporal isolation and gametic isolation are two possible prezygotic barriers of the Hawaiian honeycreepers that contribute to occur speciation. The newly available niches could lead to speciation of that organisms that tolerate the Hawaiian climatic conditions when the extinction of Hawaiian honeycreepers occurs. The new organisms used the available resources such as food and space etc and increase its population.
Cory states the following argument about the evolution of aardvarks and anteaters.
"Aardvarks and anteaters both use long, sticky tongues to capture and eat ants or termites. Aardvarks are native to Africa, while anteaters are native to the Americas. However, their similarities provide evidence that both groups of species evolved from a common ancestor that used its tongue to eat ant-like insects."
Which claim, if supported by evidence, would provide the strongest counter-argument AGAINST Cory's argument?
A. The tongues and diet of aardvarks and anteaters are an example of convergent evolution.
B. The tongues and diet of aardvarks and anteaters are an example of adaptive radiation.
C. The Americas and Africa were once joined together, and animals roamed freely between the two lands.
D. A long, sticky tongue evolved in response to the tunneling behavior of ants, an example of coevolution.
The north pole of a compass magnet points toward
O A. magnetic north
B. geographic south
C. geographic north
D. magnetic south
SUBMIT
D. Magnetic south
Hope this helps :)
4. Darwin and Wallace both gathered a large number of observations and facts on which they based
their theories. Which of the following types of evidence was NOT part of the evidence they gathered?
a. fossil evidence
b. anatomical evidence
C. geographical distribution
d. genetic evidence
Answer:
c I hope I got it but have a good day
The type of evidence that should not be part of should be genetic evidence.
What is genetic evidence?It is the evidence where it predicted the no of human ancestors. Here the relation between the genetic diversity & the size of the population should be considered. So based on this, it received large no of observations and facts related to the fossil, anatomical, and the geographical evidence
Therefore, the option d is correct.
Learn more about evidence here: https://brainly.com/question/19248221
Toxicology is used to determine
A. the classification of a pathogen
B. the vectors of a disease
C. how poisonous a substance is
D. what emerging viruses can cause disease
Other:
If data for the growth of this bacterial population continued to be recorded, would the data point at 60 hours be above or below 37 million? Support your answer.
Answer:
Above 37 million
Explanation:
Explanation in picture below
Growth of bacterial cultures is defined as an increase in the number of bacteria in a population rather than an increase in the size of individual cells.
Thus, Bacterial population growth occurs geometrically or exponentially: in each division cycle (generation), one cell produces 2 cells, then 4 cells, then 8 cells, then 16, then 32, etc.
The relationship shows that the average generation time is constant and the growth rate of the bacterial population is proportional to the number of bacteria at any given time.
This relationship is valid only during the period when the population grows exponentially, ie. in the logarithmic phase of growth. Therefore, graphs showing the growth of bacterial cultures are plotted as the logarithm of the number of cells.
Thus, Growth of bacterial cultures is defined as an increase in the number of bacteria in a population rather than an increase in the size of individual cells.
Learn more about bacterial population, refer to the link:
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#SPJ3
I NEEEEEEDDDDDD HEEEEELLPPPPPPP
Answer:
Homeostasis
Explanation:
Homeostasis is the process which maintains the temperature level of our body.
how names and zodiacs affect who people are and how they look
The seasonal elements of ancient astrology are as follows: Spring (wet becoming hot) – Air – Gemini, Libra, Aquarius. Summer (hot becoming dry) – Fire – Aries, Leo, Sagittarius. Autumn (dry becoming cold) – Earth – Taurus, Virgo, Capricorn.
The neurons that send signals from the brain to the body muscles are motor neurons
true or false
Answer:
true
Explanation:
Which can be prevented with vaccines: bacteria,
viruses, or both?
Answer:
Both
Explanation:
But not all viruses can be stopped by vaccines as there are retro viruses which are impossible to stop
Identify the kind of response to the following argument: Argument: In nature, a species is more likely to survive when its weak members die out, so we should let the weak in our society die out. Response: In nature, a species is more likely to survive when it lives in its natural habitat, so we should live in our natural habitat. A. refutation by parallel reasoning B. refutation by reduction to absurdity C. refutation by counterexample D. not a refutation
Answer:
A. refutation by parallel reasoning
Explanation:
A refutation by parallel reasoning is an analogical inference between two arguments. This type of refutation occurs when an argument is invalidated by showing that the argument's conclusion is not supported by its premises, thereby the structure of the argument is incorrect. The parallel argument should demonstrate that the premises of the target argument are founded in a fallacy or don't provide a strong enough rationale to support/accept its conclusion.
What is one result of the convection currents in Earth's outer core?
a
Erosion
b
Earth's magnetic field
c
Earth's gravity
d
The melting of the polar ice caps
Answer: b. Earth's magnetic field
Explanation:
Which of the following is true about our body's system?
a The skeletal system sends messages to the body
b Blood cells are pat of the nervous system
c The digestive system helps carbon dioxide leave the body through the lungs
d The digestive systems helps break down food into energy
Answer:
D. The digestive system helps break down food into energy.
Explanation:
Hope this helps! I am 100% certain that this is the correct answer.
Is chloroplast eukaryotic or prokaryotic?
Answer:
Chloroplasts are eukaryotic, as they are present in all eukaryotic cells and all prokaryotic cells lack chloroplasts
Explanation:
4. The suns energy causes water to change from liquid to gas during the process of ..
A. precipitation
B. condensation
O C. evaporation
O D. Water cycle
PLEASE HELP ME!!!!
IT IS FOR BIOLOGY!!!
Answer:
B.
Explanation:
If the fish population is decreasing, then there will be a loss in biodiversity, then causing a problem in the ecosystem.
Plz help fast will mark brainliest!!!
Answer:
100 miles per hour
Explanation: