Which one of the following correctly lists the three layers of an arterial wall, beginning at the lumen and moving outward?
a. tunica intima, tunica media, tunica adventitia b. tunica intima, tunica muscularis, tunica externis c. tunica inner, tunica middle, tunica external d. endothelium, circular muscle, longitudinal muscle

A- Tunica intima, tunica media, tunica adventitia.

Tunica intima

Is the internal layer of the arterial wall, it is a sqaumous epithelium which is surrounded by connective tissue and elastic fibre, it provides a one way flow of blood.

Tunica media

The middle layer is made of smooth muscles and is the thickest layer that changes the arteries diameter controlling blood pressure and flow.

Tunica adventitia

A dense outer layer of the arterial wall made of connective tissue. It consist of collagen fiber and provides protection to the blood vessel.

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.

sex cells are usually half's then they find another half and make a fertilize egg