Question

select your prediction for this experiment with regards to physical activity. a. pulse rate decreases after standing or exercise. b. pulse rate increases after standing or exercise. c. pulse rate is not affected by standing or exercise.

Explanation:

When the body engages in physical activity (like standing or exercise), the muscles need more oxygen. The heart pumps faster (increasing pulse rate) to supply oxygen - rich blood. So pulse rate should increase after standing or exercise.

Answer:

B. Pulse rate increases after standing or exercise.