Answered

Why does the heart automatically adjust the flow of blood to match activity levels?
A. Extreme activity damages blood cells and the body needs replacements.
B. The heart requires more oxygen when exercising.
C. It reduces the level of oxygen in the blood.
D. Organs and muscles require more blood under stress.
Please select the best answer from the choices provided.
O A
Ов



Answer :

GinnyAnswer

Final answer:

The heart adjusts blood flow based on activity levels by increasing circulation to meet oxygen demands.


Explanation:

The heart automatically adjusts the flow of blood to match activity levels for various reasons. During physical activity, the muscles require more oxygen and nutrients, leading to an increase in blood supply to those areas. This is achieved through a combination of increased heart rate and stroke volume, allowing the body to meet the higher oxygen demands.


Learn more about Cardiovascular system regulation here:

https://brainly.com/question/9460128


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