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Exocytosis of ACh into the synaptic cleft. As soon as Ca++ ions enter the axon:
A. Calcium ions enter the axon
B. Calcium ions are pumped back into the
C. Acetylcholine is released into the synaptic cleft
D. Acetylcholine binds to post-synaptic receptors
on the sarcolemma.
E. Na+ moves across the sarcolemma into the
F. Opening of the chemically-gated sodium
G. Opening of the voltage-gated sodium channels.
Score: Opening of potassium channels.
Binding of calcium ions to Troponin C.
Uptake of ATP by the myosin heads.
Attachment of actin-myosin crossbridges and
swiveling of the myosin heads.
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spatial summation If several inputs to a reflex pathway each produce simultaneous sub-threshold depolarizations, it could result in _____ at the receptive region of the
A. temporal summation
B. spatial summation Value
100% C. action potential
D. All of the above.
E. #1 and #3 only. 0%
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Epidermis Match descriptions with letters in the diagram of the epidermis. (Click on the word "diagram")
The layer missing from thin skin. C The layer which constantly exfoliates. B Its cells contain numerous keratin filaments. D This layer undergoes constant mitosis. E Its cells contain dense keratin granules. A Statement
The layer missing from thin skin.
The layer which constantly exfoliates.
Its cells contain numerous keratin filaments.
This layer undergoes constant mitosis.
Its cells contain dense keratin granules.
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There are _____ pair of ribs. There are _____ pair of ribs. Response
% A. 7
C. 12 Student Response Value
100% D. 10 0% Score: Feedback 0.5/0.5 14.
reative refractory period The relative refractory period occurs during:
A. opening of Na+ gates
B. opening of K+ gates
C. closing of K gates when excess K has left the
D. opening of K+ gates when excess K+ has left the
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frequency summation High frequency stimuli result from:
A. A stimulus which is broadly spread on the
B. A stimulus of high intensity on the body's soma. 100%
C. Many neurons functioning at the same time.
D. Both #1 and #3.
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parenchymal repair When a tissue experiences parenchymal repair the new tissue _____ produce the tissue's orignal function. A. does Student Response Value
100% B. does not 0% Feedback Score: 0.5/0.5 20.
synovial sack A sack made of synovial membrane which lies between tendons, ligaments, and nearby bones is called:
A. a bursa
B. a retinaculum
C. a syndesmosis
D. a synchondrosis
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facilitation Prior sub-threshold depolarization of a reflex pathway produces:
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- Fall '12