D) blood can pool in the exercised parts of the body and diminish the return of blood to the heart
The answer is D. Environmental
A. you need to use your maximum heart rate, which is determined by subtracting age from 220<span /> to set your intensity level.
The answer to your question is WHETHER ILLEGAL DRUGS ARE USED BY OTHER FAMILY MEMBERS
Answer:The circulatory system is the body's transport system. ... It filters out organisms that cause disease, produces white blood cells, and generates ... tell your muscles and organs what to do and how to respond to the environment.