When sleeping the body's circulatory system begins to slow down. It is easier for the blood to circulate throughout the body.
Lowers
Yes, your circulatory system is always at work even when you are sleeping to provide your body with oxygen and nutrients.
Your hear rate increases because it is trying to pump out more blood.
It returns to the circulatory system
during cellular respiration
read your book and find out
Even during gestation, fetal kittens have a closed circulatory system.
It speeds up.
you take medicine to kill the germs
closed circulatory system (double circulatory system)
They're both the circulatory system.
Amphibians have closed circulatory system Closed
no