I think it's A, but I'm not sure if this is the correct answer. I apologize if it is wrong.
A is the correct answer to this
Answer: My answer to this is physiology because it is the movement of blood through the vessels from the arteries to the capillaries and into the veins.
Explanation:
Gender, age and body weight are the main determinants of total energy expenditure.
Answer: Endocrine glands release hormones into the bloodstream. This lets the hormones travel to cells in other parts of the body. The endocrine hormones help control mood, growth and development, the way our organs work, metabolism , and reproduction. The endocrine system regulates how much of each hormone is released.
Explanation: have a good day! :)