Nuclei relating to the startle reflex are located in the corpora quadrigemina of the midbrain.
Indicate whether the statement is true or false
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Question 2) Spastic paralysis suggests involvement of the ________.
A) spinal nerve roots
B) lower motor neurons
C) neuromuscular junction
D) upper motor neurons
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Question 3) Passing through the NREM stages (1 through 4), the frequency of the EEG waves declines, but their amplitude increases.
Indicate whether the statement is true or false
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Question 4) Matching
A) C
B) E
C) A
D) B
E) D
1) White fiber tracts.
2) Thalamus.
3) Pons.
4) Hypothalamus.
5) Medulla Oblongata.
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Question 5) When a neurotransmitter like acetylcholine is acting in an excitatory manner which of the following is likely a result of the acetylcholine acting on the post synaptic cell?
A) Chemically gated chloride channels will open.
B) Chemically gated potassium channels will open.
C) Chemically gated sodium channels will open.
D) Chemically gated sodium channels will be closed.
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Question 6) If a post synaptic cell is stimulated to threshold by temporal summation this implies that ________.
A) the postsynaptic cell can be influenced by only one presynaptic cell
B) the postsynaptic cell is sending frequent action potential
C) a presynaptic neuron is sending frequent EPSP
D) the presynaptic neuron is sending frequent IPSP
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Question 7) If a post synaptic neuron is stimulated to threshold by spatial summation this implies that ________.
A) the post synaptic cell has a lower than normal threshold
B) the post synaptic cell has many voltage gated ion channels
C) the post synaptic cell is slow to repolarize
D) the postsynaptic cells has many synapses with many presynaptic neurons
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Question 8) What type of muscle assists an agonist by causing a like movement or by stabilizing a joint over which an agonist acts?
A) a prime mover
B) an agonist
C) a synergist
D) an antagonist
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Question 9) During the relative refractory period of an action potential, a larger than normal stimulus is needed to cause another action potential. This is due to the fact that ________.
A) the voltage gated potassium ion channels remain open long enough to hyperpolarize the axon membrane
B) the membrane is now impermeable to all ions
C) the sodium potassium pump will stop working during relative refractory
D) the inactivation gates on voltage gated sodium ion channels are closed
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Question 10) The depolarization phase of an action potential is punctuated by the closing of inactivation gates in the voltage gated sodium ion channels. All of the following are consequences of this inactivation except one.
Choose the statement below that is not a consequence of the closing of inactivating gates.
A) This allows for the efflux (diffusion out) of potassium ions, resulting in the repolarization of the cell.
B) This allows for the one way transmission of action potential down the axon.
C) This limits the frequency of action potentials down the axon.
D) This stops the depolarization of the axon membrane.
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