Question

which of the following physiological effects occurs as a result of increased exercise?
a the bodys blood pressure decreases throughout the body
b the blood flow is directed towards the large organs
c the levels of oxygen in the body decreases
d the volume of blood pumped by the heart increases
please select the best answer from the choices provided.
o a
o b
o c
o d

Explanation:

• When exercise increases, the body's demand for oxygen and nutrients increases. The heart has to pump more blood to meet this demand. So, the volume of blood pumped by the heart (cardiac output) increases.
• Option A: Blood pressure actually increases during exercise in most parts of the body (not decreases) as the heart is working harder and blood vessels to active muscles dilate while some to less - active areas (like digestive organs) constrict but overall pressure is up.
• Option B: During exercise, blood flow is directed towards the working muscles (not large organs like the digestive organs which have reduced blood flow during intense exercise).
• Option C: The body's oxygen levels do not decrease. Although the body uses more oxygen during exercise, the breathing rate also increases to take in more oxygen.

Answer:

D. the volume of blood pumped by the heart increases