Acetylcholine (Ach) and Norepinephrine (NE) are both chemical substances (neurotransmitters) released primarily by nerve cells and they affect different parts and systems of the body. Acetylcholine mostly targets the muscles and the brain and it is a part of the parasymphatetic nervous system whereas norepinephrine targets the whole body and has an effect that leads to the contraction of muscles and the increase of the heart rate. Norepinephrine is a part of the symphatetic nervous system.

Since the symphatetic nervous system is responsible for the crucial "fight-or-flight" response of our body, it has a more dramatic effect on the muscle contraction. Norepinephrine, being a part of the symphatetic nervous system, should result in a more drastic change in contractile force.

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3 0

4 years ago

Compared with the walls of arteries, the walls of capillaries.

madam [21]

The correct answer is B. are thinner.

Compared with the walls of the arteries are thinner than the walls of the capillaries.
Capillary is termed as a small blood vessel which is from five to ten micrometers. They are known to be the smallest blood vessels in the body.

They do convey blood between venules and arterioles. Substances which exits from capillaries include glucose, water, and oxygen. In embryonic development, new capillaries are formed through vasculogenesis.
The artery is termed as the blood vessel which takes away blood from the heart to the other parts of the body. Many arteries carry oxygenated blood except umbilical arteries and pulmonary artery which carries deoxygenated blood. Arteries are responsible to deliver nutrients and oxygen to all cells as well as they remove carbon dioxide and waste products.

6 0

3 years ago

Read 2 more answers

Where in water is being converted into a gaseous form?

DiKsa [7]

Answer:

evaporation

Explanation:

all the others have a completely different meaning

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7 0

3 years ago