| A | B |
|---|
| 2 parts of the PNS | afferent and efferent |
| 2 parts of the nervous system | CNS and PNS |
| afferent neurons | sensory; carry impulses to the CNS |
| efferent neurons | motor; carry impulses from the CNS |
| 2 parts of the efferent system | somatic and autonomic |
| somatic system | effector cells are skeletal muscle cells |
| autonomic system | effector cells are smooth muscle, cardiac muscle, and exocrine glands |
| function of the autonomic system | homeostasis |
| 2 divisions of the autonomic system | symathetic and parasympathetic |
| sympathetic | preganglionic; cell bodies are in the thoracic and lumbar regions, not near organs |
| parasympathetic | cell bodies are in the craniosacral regions; parasym ganglia lie in/near organ; innerv by post ganglionic neurons |
| function of the parasympathetic system | accumulation, storage, and preservation of body resources; NOT widespread stim |
| function of the sympathetic system | preparing for strenuous activity, stress, or emergency; widespread stim. |
| ACh synthesis | glu-> pyruvate-> AcetylCoA + choline-> ACh |
| all neurons that release ACh are * | cholinergic |
| drugs that mimic ACh are called * | cholinomimetic |
| drugs that oppose ACh are called * | cholinoceptor antagonists or blockers |
| 2 groups of cholinoreceptors are * | muscarinic and nicotinic |
| EPI and NOR release sites | most sympathetic postganglionic neuoreffector junctions |
| NOR synthesis | tyrosine-> dopa or dopamine-> NOR(in the vescicles) |
| what happens if NOR leaks out of the storage vescicles? | MAO degrades or returned to vescicle via dopamine transport mechanism |
| after release into synapse how is NOR removed? | neuronal transport, diffusion into circ and destroyed by COMT or MAO in liver, or trans to effector and inactiv by COMT |
