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3 years ago

Synaptic plasticity in response to psychoactive drugs can result in which of the following?

Biology

1 answer:

Ksenya-84 [330]3 years ago

6 0

A,B,C and D

A. increase in the number of available neurotransmitters

B. decrease in the number of available neurotransmitters

C. increase in the number of receptors and receptor sites

D. the ability of the synapse to change in strength and function when the pathway is overused or underused

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Elastic fibers are important to muscle tissue since they resist excessive stretching and help muscle fibers spring back to its o

brilliants [131]

Answer:

True

Explanation:

Elastic fibers are composed of elastin, myofibrils and fibrillin. They are distributed <u>separately</u>, and therefore do not form bundles(they actually form a kind of mesh), like collagen fibers.

Elastic fibers are usually thin and long and can stretch up to 1.5x of their total length.

These fibers confer elasticity to the connective tissue. The mesh formed of elastic fibers easily yields to minimal tensions, returning to its original shape as soon as the deforming forces cease.

An example of the action of elastic fibers is when we pull the skin from our hands and release it, the elastic fibers are responsible for quickly returning the skin to its original shape.

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3 years ago

What type of energy is coming into the food web?

Rufina [12.5K]

Answer:

The vast majority of energy that exists in food webs originates from the sun and is converted (transformed) into chemical energy by the process of photosynthesis in plants. A small proportion of this chemical energy is transformed directly into heat when compounds are broken down during respiration in plants.

Explanation:

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3 years ago

What does the electron cloud model describe?

Nimfa-mama [501]

The electron model most likely describes the locations of electrons sin atom.

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3 years ago

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What is melanin and what is its role in the epidermis?

Misha Larkins [42]

Melanin provides pigmentation to the skin and it also provides UV ray protection (which is its role in the epidermis).

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3 years ago

Based on the model presented, which of the following statements expresses the proper relationship between osmolarity, ADH releas

inn [45]

Question: Based on the model presented, which of the following statements expresses the proper relationship between osmolarity, ADH release, and urine production?

(A) As tissue osmolarity rises, more ADH is released, causing less water to be excreted as urine.

(B) As tissue osmolarity rises, less ADH is released, causing less water to be excreted as urine.

(D) As tissue osmolarity rises, less ADH is released, causing more water to be excreted as urine.

Answer:

As tissue osmolarity rises, more ADH is released, causing less water to be excreted as urine.

Explanation:

ADH is the hormone that triggers the formation of concentrated urine by stimulating the absorption of water from the filtrate in the kidneys. As the solute concentration (osmolarity) in the blood raises, the more of the ADH is released into the blood. ADH triggers reabsorption of water in collecting duct and distal tubules and thereby, reduces the water loss in urine. Increased reabsorption of water restores the osmolarity, blood volume, and blood pressure.

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3 years ago