Question

what does the term systole refer to in the cardiac cycle?
a. the phase when the ventricles relax
b. the phase when the ventricles contract
which cardiovascular condition involves the buildup of plaque in the arteries?
a. hypertension
b. coronary artery disease
what happens to blood in the lungs during the circulatory process?
a. it absorbs nutrients
b. it exchanges carbon dioxide for oxygen
what is the role of the pulmonary veins?
a. to transport waste products to the kidneys
b. to bring oxygenated blood back to the heart from the lungs

Explanation:

First Question:

In the cardiac cycle, systole is the contraction phase of the ventricles (diastole is relaxation). So option b is correct.

Coronary artery disease is characterized by plaque buildup in arteries (atherosclerosis). Hypertension is high blood pressure, not plaque buildup. So option b is correct.

In the lungs, blood undergoes gas exchange: it releases carbon dioxide and takes in oxygen. Absorbing nutrients is done in the digestive system. So option b is correct.

Answer:

b. The phase when the ventricles contract

Second Question: