Question

what must occur during exercise to ensure adequate oxygen delivery to cardiac muscle?
multiple choice
an increased oxygen release to cardiac muscle
a decreased oxygen content to skeletal muscle
decreased heart rate
increased coronary blood flow

Explanation:

During exercise, the cardiac muscle needs more oxygen. Coronary blood vessels supply oxygen - rich blood to the cardiac muscle. An increased coronary blood flow ensures more oxygen is delivered to meet the higher demand of the cardiac muscle during exercise. Decreased heart rate would reduce blood circulation and oxygen delivery. Decreasing oxygen content to skeletal muscle is not related to ensuring oxygen delivery to the cardiac muscle, and just an increased oxygen release to cardiac muscle without increased blood flow is not sufficient.

Answer:

D. Increased coronary blood flow