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galina1969 [7]
1 year ago
15

Neurotransmitters are released from axon terminals via _______. A. osmosis B. active transport C. diffusion D. exocytosis

Biology
1 answer:
Nutka1998 [239]1 year ago
6 0

The correct option is D

Neurotransmitters are released from axon terminals via exocytosis.

A neurotransmitter is stored inside synaptic vesicles which is a small sac-like structure. It is released into the synaptic cleft from axon terminals when a cell membrane fuses with vesicles. This process is termed exocytosis with the capability to release neurotransmitters in less than a millisecond.

In neurons of the nervous system, synaptic vesicle exocytosis occurs. Nerve cells communicate by electrical or chemical signals called neurotransmitters which are passed from one neuron to the next one. This transmission of neurotransmitters occurs by exocytosis.

The fundamental biological events of neurotransmission are dependent on neuronal communication and brain function including exocytosis of presynaptic vesicles which is for the release of neurotransmitters and the subsequent endocytosis.

Learn to know more about the release of neurotransmitters from a neuron on

brainly.com/question/12993033

#SPJ4

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A researcher claims that all living cells must be able to synthesize proteins in order to maintain homeostasis and perform basic
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Answer: Option B) Nuclei house the DNA, which is the blueprint for proteins. Cell types I, II, and III can synthesize proteins.

Explanation:

All the genetic information that determines the traits expressed in an organism are loaded up within the DNA sequence. Hence, several genes that codes functional proteins are derived from the DNA, making DNA a blueprint for protein synthesis.

Thus, Cell types I, II, and III with DNA can synthesize proteins.

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3 years ago
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Hector spent the last three months on a winter fishing boat in Alaska. He was doing research on population levels of fish for co
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Answer:

Hector spent the last three months on a winter fishing boat in alaska. he was doing research on population levels of fish for conservation efforts. hector most likely works in. plant systems.

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2 years ago
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What is the percentage size difference between the giant dragonfly and the modern dragonfly?
viva [34]

Answer:

Giant Dragonfly - 2.5 FEET

Modern Dragon Fly - 1-4 Inches.

Explanation:

Size Difference in Percentage: The Giant Dragonfly is 250% - 160% bigger than the Modern Dragonfly.

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3 years ago
1. How many food chains make up the food web?
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Answer:

A food web can be formed by more than one food chain, since the webs includes all possible interactions that can occur between individuals of different trophic levels.

Explanation:

Based on the scheme shown in the image

<h3>1. How many food chains make up the food web? </h3>

This food network is made up of three food chains

  1. <em>Plant → Bird → Snake</em>
  2. <em>Plant → Insect  → Bird → Snake</em>
  3. <em>Plant → insect → Frog → Snake</em>

Food webs often include several food chains, since they are due to the interaction between organisms at different trophic levels, which actually happens within an ecosystem.

<h3> 2. Which organism is an herbivore? </h3>

In this case, both the insect and the bird are herbivorous organisms, since they feed of the producer, which is the plant.

<h3> 3. Which organism is an autotroph? </h3>

The only autotrophic organism is the plant, since it is capable of manufacturing its nutrients from sunlight and inorganic matter.

<h3> 4. Which organism is a third-order heterotroph? To what trophic level does that organism belong? </h3>

The third order heterotroph is the snake, since it feeds on other animals.  The snake is a carnivore and can be a secondary or more commonly tertiary consumer, so it can be placed in the 3rd or 4th trophic level.

<h3> 5. Which organism is an omnivore? </h3>

According to the scheme proposed, the bird is omnivorous, since it feeds on both plants and insects.

<h3> 6. Which organisms belong to more than one food chain? </h3>

In this case, the plant, the insect, the bird and the snake are part of more than one food chain.

  1. <u><em>Plant → Bird → Snake</em></u>
  2. <u><em>Plant → Insect  → Bird → Snake</em></u>
  3. <u><em>Plant → insect</em></u><em> → Frog → </em><u><em>Snake</em></u>
<h3> 7. Which organism belongs to more than one trophic level? </h3>

The bird can be located in both the second and third trophic level, being a primary consumer —when it feeds on plants— or secondary, when it feeds on insects.

<h3> 8. What are decomposers? From which trophic levels are the organisms that decomposers feed on? </h3>

Decomposers are generally bacteria and fungi, organisms capable of degrading organic matter, thus enriching the soil. Decomposers can feed on any trophic level.

<h3> 9. What does a pyramid of energy show about the amount of energy available at different trophic levels of a food chain? </h3>

As the ascent of the pyramid occurs —or at the upper trophic level— the amount of energy available decreases. This is because from one trophic level to another only 10% of the energy can be used. If a plant has 5000 Kcal available, the herbivore that consumes it can only use 500 Kcal.

<h3> 10. Why do different trophic levels have different amounts of energy?</h3>

The main <u>reason for the difference in energy in each trophic level is that energy is lost in each one of them</u>, which the organisms use in their metabolism. A consequence of the metabolism is the loss of energy as heat, which is acquired by the environment.

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