peripheral nervous system (PNS)
Autonomic nervous system
It is responsible for monitoring conditions in the internal environment and bringing about appropriate changes in them. The contraction of both smooth and cardiac muscles are controlled by motor neurons of the autonomic system
Sympathetic division
It is responsible for monitoring conditions in the internal environment and bringing about appropriate changes in them. The contraction of both smooth and cardiac muscles are controlled by motor neurons of the autonomic system
Sympathetic division
- Stimulation
- Energy generation
- Prepares body for emergencies:
“Fight or flight" - the release of epinephrine from the brain into the blood to ensure all cells of the body will be exposed to sympathetic stimulation.
Parasympathetic Nervous System
Danger! --> Sympathetic --> Parasympathetic
system system
Sympathetic & Parasympathetic often have antagonistic actions, however they cooperate to maintain homeostasis!
- Calming
- Rest and repair
- Returns body functions to normal after they have been altered by sympathetic stimulation.
Danger! --> Sympathetic --> Parasympathetic
system system
Sympathetic & Parasympathetic often have antagonistic actions, however they cooperate to maintain homeostasis!
To better understand the CNS and PNS, we need to explore the cells of the nervous system so that we can understand why it's structure efficiently carries a nerve impulse or message to the effector organs of our body.
Resources:
DiGiuseppe, Maurice et al. (2003). Nelson Biology 12. Nelson Canada ELHI (1 Edition). Toronto, Ontario: Thomson Canada Limited
DiGiuseppe, Maurice et al. (2003). Nelson Biology 12. Nelson Canada ELHI (1 Edition). Toronto, Ontario: Thomson Canada Limited