In which lymphatic organ do T cells mature?.

Choice A rationale:

Increased blood viscosity is not typically associated with atherosclerosis. While high blood viscosity can contribute to cardiovascular problems, it is not a condition that you would expect to accompany atherosclerosis.

Choice B rationale:

Irregular heartbeat, or arrhythmia, is not typically a condition that accompanies atherosclerosis. While atherosclerosis can increase the risk of certain types of arrhythmias, it is not a direct result of the disease.

Choice C rationale:

High blood pressure, or hypertension, is often associated with atherosclerosis. The buildup of plaque in the arteries causes them to narrow and stiffen, which increases the resistance to blood flow and consequently increases blood pressure.

Choice D rationale:

Low blood pressure is not typically associated with atherosclerosis. Atherosclerosis tends to increase blood pressure rather than decrease it.

hoice A rationale:

External intercostals assist in inspiration by elevating the ribs and expanding the chest cavity.

Choice B rationale:

Abdominals are not the main muscles responsible for pulmonary ventilation.

Choice C rationale:

Internal intercostals assist in forced expiration.

Choice D rationale:

The diaphragm is the main muscle responsible for pulmonary ventilation.

So, the correct answer is Choice D, after analyzing all choices.