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anatomy test
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Central
brain and spinal cord
Peripheral
nerves that extend from the brain and spinal cord (outside of the CNS
Somatic
Somatic nerve fibers that conduct impulses from the CNS to skeletal muscles; under conscious control
autonomic
Visceral motor nerve fibers that regulate the activity of smooth muscles, cardiac muscles, and glands
identify the following structures on the neuron
A. dendrites
B. axon
C. axon hillock
D. myelin sheath
E. node of ranvier
leak channels
channels always open (ungated): do not respond to any signals
ligand-gated channels
channels open when the appropriate chemical (neurotransmitted) binds
voltage-gated channels
channels open and close in response to membrane potential (V changes).
label the following diagram, label presynaptic cell, postsynaptic cell, gated channels, synaptic cleft and synaptic vesicles.
1. presynaptic cell
2. synaptic vesicles
3. synaptic cleft
4. gated channels
5. postsynaptic cell
Briefly list and describe the five steps of producing an action potential
STEP1
: Resting state – all gated Na+ and K+ channels are closed
STEP 2
: Voltage-gated Na+
channels open and Na+ enters the nerve cell
STEP 3
: Na+ channels are inactivated and K+ channels activate; K+ leaves the cell
STEP 4
: K+ channels remain open and Na+ channels reset
Define motor homunculus and list two examples of areas that are disproportionately large in the motor homunculus
Motor homunculus
: regions of neurons that control muscles in body areas having precise motor control.
Example 1
: Face
Example 2
: Hands
Vestibular cortex
responsible for balance
Broca’s area
controls muscles involved in speech production and plans speech and other motor activities
Olfactory cortex
allows for awareness of odors
Dopamine
pleasure neurotransmitter involved with smooth motor movements; deficient in those afflicted with Parkinson’s disease
Endorphins
inhibit pain (labor, athlete); morphine and heroin bind to
endorphin receptors
Author
jstn760
ID
51554
Card Set
anatomy test
Description
11, 12 part 1
Updated
2010-11-24T20:10:02Z
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