2007-01-13 07:38:22 · 2 answers · asked by andrew 3 in Education & Reference ➔ Homework Help
Your heart is at the center of your circulatory system. The heart will have an intrinsic rate of about 80 beats per minute, but that can be controlled by the brain.
You have a sympathetic nerve system that acts in such a way as to increase your heart rate and metabolism when there is a stress, such as exercise, on your body. Your heart beats faster and you breathe faster so that you can increase the amount of oxygen being delivered to the muscles. When the stress is over and your oxygen debt is repaid, you have a parasympathetic nervous system that does the reverse -- it slows the respiratory and pulse rates back down to normal.
2007-01-13 08:22:27 · answer #1 · answered by Richard B 4 · 0⤊ 0⤋
circulatory. your heart has to pump blood harder and faster to the body.
2007-01-13 16:23:51 · answer #2 · answered by Caitlin 2 · 0⤊ 0⤋