Question

1. the threshold of excitation for a typical neuron is: a. +30 mv b. +55 mv c. -55 mv d. -70 mv 7. the system that is responsible for returning the body to a state of homeostasis or routine operation is known as: a. the sympathetic nervous system b. the parasympathetic nervous system c. somatic nervous system d. down - regulation system

Explanation:

The threshold of excitation for a typical neuron is around -55 mV. When the membrane potential of a neuron reaches this value, an action - potential is likely to be generated. The parasympathetic nervous system is responsible for returning the body to a state of homeostasis or routine operation. The sympathetic nervous system is involved in the body's "fight - or - flight" response. The somatic nervous system controls voluntary muscle movements. There is no such thing as a "down - regulation system" in the context of these options.

Answer:

1. C. -55 mV
2. B. the parasympathetic nervous system