Question

14/35
how does the body respond when more oxygen is required?
decreasing blood pressure
increasing blood pressure
increasing heart rate
decreasing heart rate

Explanation:

When the body needs more oxygen (e.g., during exercise), the heart pumps faster (increasing heart rate) to deliver more oxygen - rich blood to tissues. Blood pressure changes aren't the primary direct response for oxygen demand, and decreasing heart rate would reduce oxygen delivery. So the correct option is the one about increasing heart rate.

Answer:

C. Increasing heart rate