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Physiology HW #3
Terms in this set (38)
Graded potentials are produced within the _______________________ segment of a neuron.
Graded potentials result from the opening of ________________.
two EPSPs in proximity to each other
What is the summative effect that brings the initial segment closest to the threshold?
When voltage-gated sodium channels are open, sodium flows _____________ the neuron making the inside of the cell more _______________.
The following information best describes the _____________ phase of an action potential.
• A membrane potential reading of +10 mV
• Inactivated voltage-gated sodium channels
• Open voltage-gated potassium channels
At the synaptic knob, voltage-gated ______________ channels open, thereby stimulating the synaptic vesicles to release their neurotransmitters by exocytosis.
Acetylcholine would build up in the synaptic cleft.
If acetylcholinesterase became mutated and nonfunctional, what would be the immediate result?
left hemisphere of brain
main language center
right visual half field
right hemisphere of brain
left visual half field
- hunger and thirst
- the autonomic nervous system
- circadian rhythms
- body temperature
relay center for sensory information
arousal from sleep
coordinates motor skills
a role in drug addiction
cardiac, respiratory, and vasomotor control centers
crossing of nerve tracts to the contralateral side
Contains the apneustic center which aids in respiration control
Inhibits NT release; may aid memory and learning
Blood vessel dilation, relax other smooth muscles
promotes odor adaptation
an action potential:
causes the inside of the neuron cell membrane to become positively charged in reference to the outside.
An action potential generates local currents that tend to _____ the membrane immediately adjacent to the action potential.
Absolute refractory period causes
action potential propagation to occur in one direction
t or f:
Threshold is the minimum current required for the cell membrane to generate an action potential.
t or f:
Action potentials can travel in both directions on the axon.
Which of the following statements about the resting membrane potential is TRUE?
The exterior of the cell has a net positive charge and the interior has a net negative charge.
During depolarization, which of the following statements about voltage-gated ion channels is TRUE?
Na+ gates open before K+ gates.
Depolarization occurs because
more Na+ diffuse into the cell than K+ diffuse out of it.
t or f:
The sodium-potassium pump is involved in establishing the resting membrane potential.
t or f:
The nerve impulse is an electrical current that travels along dendrites or axons.
The primary neurotransmitter at the neuromuscular junction is
post-synaptic side of a neuromuscular junction
1. Sodium ions move into muscle cell
2. Depolarization of the post-synaptic membrane
3. Action potential is propagated over the muscle cell membrane
t or f:
The area between the pre-synaptic nerve cell and the post-synaptic muscle cell is termed the synaptic cleft.
t or f:
Receptors that bind the neurotransmitter at the post-synaptic cell membrane are voltage-gated.
- Contraction of urinary bladder
- Constriction of pupil
- Increased motility in gastrointestinal tract
increased heart rate
dilation of bronchioles
ejaculation of the penis
stimulation of fat hydrolysis
increase in strength of heart muscle contraction
skeletal muscle activation
movement of the body
merocrine glands activation
lacrimal glands activation
arrector pili muscles activation
intestinal smooth muscle activation
can be excitatory or inhibitory on the target organ
movement through the body
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