Answer:
Explanation:
The muscular system is an organ system consisting of skeletal, smooth and cardiac muscles. It permits movement of the body, maintains posture and circulates blood throughout the body.
If Cecelia wants to lower her heart rate she should lower the speed she is going at on her tradmill so that she does not have to breath was much for oxygen
std's are caused by an infection called trichomoniasis which is caused by parasites which then causes std's
<span><span>Central nervous system (CNS)
</span>Peripheral nervous system (PNS)</span>
.
Autonomic nervous system (ANS)
