Phys Ch10,11 Exam2
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Conversion of stimulus energy into electrical energy; chg in mem potential in response to a stimulus acting on a sensory receptor by opening or closing ion channels
Components of a sensory unit
- Single afferent neuron, plus all receptors associated w/it (at PNS) (receptive field)
- Sensory receptors--> axon--> cell body--> axon--> axon terminals in CNS
Decrease in amplitude of receptor potential over time in presence of constant stimulus which causes decrease in frequency of action potentials (decreases perception of a stimulus)
What is primary function of autonomic nervous system?
What are it's 2 branches?
Is it afferent or efferent branch of nervous system?
- Regulate organs to maintain homeostatis
- Parasympathetic and sympathetic nervous system
The ___ nervous system is "rest and digest" state; increased GI activities; decrease bp & hr
The ___ nervous system is "fight or flight" state; mobilizes energy stores; decrease GI function
Most effector organs are innervated by _____ ANS
both parasympathetic and sympathetic
Primary NT of parasympathetic nervous system
Primary NT of sympathetic nervous system
How many neurons are involved in the autonomic pathway b/w CNS and organs to which it effects? (effector organs)
2 (pre- and postganglionic neuron meet at autonomic ganglion)
Preganglionic neuron is ___ and postganglionic neuron is ___.
(cholinergic or adrenergic)
Axon swellings which contain stored NTs
Synpase b/w postganglionic neuron and effector organ
Diff b/w process of releasing NTs normally in a synapse, and at neuroeffector junctions
At neuroeffector junctions, the action potential which caused start of process (voltage-gated Ca channels opening, etc etc) travels on to the next varicosity
Somatic Nervous System:
Voluntary or involuntary control?
Number of neurons in pathway & where
- Skeletal muscle
- Nicotinic cholinergic in skeletal muscle
- One; spinal cord --> muscle
One motor neuron plus all of the muscle fibers it innervates
Does one neuron innervate multiple muscle
Does one muscle fiber have multiple neurons
No; each mucle fiber is innervated by only one motor neuron
Synapse b/w a motor neuron and a muscle fiber
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