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Physiology W7

Week 7

QuestionAnswer
The active transport mechanism in the plasma membrane that transports sodium and potassium ions in opposite directions and at different rates is the sodium-potassium pump.
Which neuron could transmit a nerve impulse the fastest? A large-diameter neuron with myelin
A synapse consists of: a synaptic knob. a synaptic cleft. the plasma membrane of a postsynaptic neuron.
When current leaps across an insulating myelin sheath from node to node, the type of impulse conduction is called: saltatory conduction.
Severe depression can be caused by a deficit in certain brain synapses of: amines.
Which is true of a neuron with a resting potential? The sodium pump has moved Na+ to the outside of the plasma membrane.
Within the nervous system, coding for the strength of a stimulus is accomplished through: the frequency of nerve impulses.
A slight shift away from the resting membrane potentials in a specific region of the plasma membrane is called a _____ potential. local
Which of the following is not one of the main chemical classes of neurotransmitters? Triglycerides
Stimulus-gated channels open in response to: sensory stimuli.
The brief period during which a local area of an axon's membrane resists re-stimulation is called the __________ period. refractor
When an impulse reaches a synapse: chemical transmitters are released.
There are two types of synapses—the electrical synapse and the __________ synapse. chemical
The fastest nerve fibers in the body can conduct an impulse that is how much faster than the slowest fibers in the body? Almost 300 times faster
A synaptic knob would be located on a(n): axon.
No impulse can be sent through a neuron: during the absolute refractory period.
Which is true of an action potential? The outside of the plasma membrane is negatively charged, and the inside is positively charged.
During a relative refractory period: the action potential can be initiated with a strong stimulus.
Neurotransmitters are released in a synapse and bind to: receptors on the postsynaptic neuron.
Created by: frisco45
 

 



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