In what way does the cardiovascular system affect the use of muscles?
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a. the cardiovascular system sends messages across synapses.
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b. the cardiovascular system provides calcium ions.
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c. the cardiovascular system carries muscle tissue around the body.
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d. the cardiovascular system provides the oxygen to make atp.

A answer is D

Explanation:

Active muscles demand huge amounts of oxygen, and the circulatory system works hard to provide it. Blood carries oxygen to the muscles. ... If the cardiovascular system fails to supply muscles with adequate oxygen, the muscles will cramp and eventually cease to function. A

it has to be understood that the sea water contains a huge amount of sodium and chlorine ions and if they enter the cell of the atlantic cod fish, the cell will shrivel and the fish will die. to avoid such a condition, the fish uses active transport for the purpose of removing the ions against the gradient.

explanation:

the atlantic cod is not a maritime osmoconformer. its native application of salts is less than that of the seawater it lives in. it is continually falling water from the gills to the ocean via osmosis.

countering that, the fish is going to be swallowing seawater. but since its internal collection of salts is lower than seawater, the fish will want to go free of excess salt, and since that's going upon a gradient, then active transport, requiring energy, must be used to pump out the salt. much marine fish use the organs to filter out the salt and these fish discharge very straight urine.