As joe prepares to spar with a tae kwon do opponent, his heart rate and respiration rate increase. these are indicators that which branch of the nervous system has been activated?

Peripheral Nervous System.

Peripheral nervous system consists of cranial nerves, spinal nerves and receptors. Since the heart rate increases, this shows that an effect has taken place and an effect only showcase when nerve impulses are being transmitted by nerves which are part of Peripheral nervous system.