Using the events as described in Lecture, which of the following is closest in t
ID: 3509675 • Letter: U
Question
Using the events as described in Lecture, which of the following is closest in time after (occurs immediately after) one action potential occurs in a T tubule? A) opening of voltage gated Na+ channels in the sarcolemma B) movement of tropomyosin C) release of Ca ++ (calcium ions) from the SR D) an end plate potential E) opening of Ca++ channels in somatic motor neuron axon terminal
Binding of __________ to _________ permits cross bridge _____________ in skeletal muscle. A) Ca++, myosin, detachment B) ATP, troponin, attachment (binding) C) Ca++, tropomyosin, attachment (binding) D) ATP, myosin, detachment
Slow oxidative fibers have __________ than fast glycolytic fibers. A)a higher ATPase activity B) more myofibrils C) more myoglobin D) more glycogen E) a larger cell diameter
Explanation / Answer
ANSWER- A our correct option is (c).(release of calcium ions from the sarcoplasmic reticulum)
-sarcoplasmic reticulum is the specific name given to the smooth muscle cells. it is specially abundant and convulated in skeletal muscle cells. its functions in the storage, release,and reuptake of calcium ions.
B-our correct option is (D).
ATP binds to the myosin head and detaches it from actin.
C- our correct option is (C).(more myoglobin).
fast glycolytic fibres fatigue rapidly,while slow oxidative fibres are highly resistance to fatigue.
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