Answer:
I believe it is the "Nucleus."
Explanation:
Hope my answer has helped you!
I’m pretty sure the answer is C
The effects of exercise on the circulatory system. This provides the muscles with the necessary oxygen and nutrients to provide the muscles with energy. During exercise strokevolume increases because: more blood is sent back to the heart due to the muscles squeezing blood in the veins. and I'll try to answer the other one just wait
