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Week 3 (Mar. 13-19) Quiz Anatomy and Physiology II -DBX-DL01
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Only allowing those voltage-gated ion channels concentrated at the nodes of Ranvierto open means myelin has what effect on action potential in the axon?
Causes it to dissipate before traveling the full length
Speeds it up
Inhibits it from occurring
Causes it to occur repeatedly down the full length
Only allowing those voltage-gated ion channels concentrated at the nodes of Ranvierto open means mye...
Speeds it up
Feedback
Correct. Myelinated neurons concentrate their voltage-gated ion channels only at the gaps between the myelin (nodes of Ranvier). A fraction of the total number of voltage-gated channels can be used, resulting in far greater speed of the action potential spreading down the axon of a myelinated neuron. See Signal Transduction.
The resting membrane potential means that the neuron has:
potassium continually leaking into it.
a positive charge inside the cell and negative charge outside the cell.
sodium and chloride outside the cell.
an equal number of positive charges and negative charges across the cell membrane.
The resting membrane potential means that the neuron has:
potassium continually leaking into it.
...
an equal number of positive charges and negative charges across the cell membrane.
Gary is 56 years old and has been a mechanic for over thirty years. His favorite hobby is woodworking,and he loves to create bowls with fine inlays of turquoise and other stones. One morning, he is puzzled because he is having trouble buttoning his shirt. His wife becomes concerned when she sees him fumbling to tie his shoelaces. They call their healthcare professional who tells them to go to the emergency room. Gary is diagnosed with a mild stroke. Based on his symptoms, where in his brain is the stroke most likely located?
Thalamus
Cerebellum
Medulla oblongata
Limbic system
Gary is 56 years old and has been a mechanic for over thirty years. His favorite hobby is woodworkin...
Cerebellum
Feedback
Correct. The cerebellum is involved in motor learning, balance, and posture. The cerebellum cannot initiate movement, but will aid in coordination and precision of the movements. Gary’s symptoms indicate he is having difficulty coordinating movements and being precise with movements. The stroke has likely damaged tissue in this region of Gary’s brain. See The Brain.
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