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Physiology Final

weeks 7 - 13

QuestionAnswer
Serotonin is an example of a(n): amine neurotransmitter.
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
When current leaps across an insulating myelin sheath from node to node, the type of impulse conduction is called: saltatory conduction.
A term commonly used as a synonym for action potential is nerve impulse.
Compared with the outside of the neuron, the inside has a(n) ____ charge negative
Stimulus-gated channels open in response to: sensory stimuli.
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.
Neurotransmitters are released in a synapse and bind to: receptors on the postsynaptic neuron.
No impulse can be sent through a neuron: during the absolute refractory period.
Dopamine, epinephrine, and norepinephrine are classified as catecholamines.
A slight shift away from the resting membrane potentials in a specific region of the plasma membrane is called a _____ potential. local
Within the nervous system, coding for the strength of a stimulus is accomplished through: the frequency of nerve impulses
When an impulse reaches a synapse chemical transmitters are released
Which neuron could transmit a nerve impulse the fastest? A large-diameter neuron with myelin
The first event to occur when an adequate stimulus is applied to a neuron is some of the sodium channels at the point of stimulation open.
Which is true of a neuron with a resting potential? The sodium pump has moved Na+ to the outside of the plasma membrane.
A mixed nerve is one that: carries both sensory and motor fibers.
Which is(are) the neurotransmitter(s) in a somatic motor pathway? Acetylcholine
A child was frightened by a large dog. The pupils of the child’s eyes became dilated, and the heart and respiratory rates increased. These symptoms were caused by stimulation of: the sympathetic nervous system.
Damage to the _____ nerve could make the diaphragm unable to function. phrenic
Nerve impulses over the _____ nerve cause increased peristalsis and decreased heart rate. vagus
Impulses from the _____ play a part in arousing or alerting the cerebrum. thalamus
How does a dually innervated autonomic effector differ from a singly innervated autonomic effector? A dually innervated effector receives input from both sympathetic and parasympathetic pathways. A singly innervated autonomic effector receives input from only the sympathetic division.
The vomiting reflex is mediated by the: medulla.
Which of the following is a description of the principle of autonomic antagonism as it relates to the autonomic nervous system? If sympathetic impulses tend to stimulate an effector, parasympathetic impulses tend to inhibit it.
The cerebellum acts with the _____ to produce skilled movement. cerebrum
Normal infants will show the Babinski reflex up to the age of _____ years 1.5-2
Acetylcholine can stimulate _____ receptors. nicotinic
One of the few hormones that functions on a positive-feedback loop is: oxytocin.
The clear and potassium-rich fluid that fills the labyrinth is endolymph.
When a small amount of one hormone allows a second hormone to have its full effect, the phenomenon is called: permissiveness.
Sensory impulses ending in what part of the CNS trigger imprecise or “crude” sensation awareness? Thalamus
The last step in the nonsteroid hormone mechanism of action is: protein kinases activate other enzymes.
Dynamic equilibrium depends on the functioning of the crista ampullaris.
When you are looking at a large green field, which cones would be sending the green wavelength to the brain? M
Created by: user-1991001
 

 



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