Question

After the stimulus voltage has been applied, what events occur during the latent period? CHECK ALL THAT APPLY.

a. troponin pulls tropomyosin off the myosin binding sites of actin

b. Action potentials move down a motor neuron

c. tropomyosin pulls troponin off the myosin binding sites on actin

d. Action potentials move down the t-tubules

e. calcium binds to troponin

f. ACh is released from the motor neuron

g. Calcium is released from the sarcoplasmic reticulum

h. calcium binds to calmodulin

I. the actin-myosin cross bridge cycle starts

Answer 1

All the given statements are correct expect C .

Tropin pulls tropomysoin of the mysoin binding site on actin but not tropomysoin pulls troponin of the myosin binding site on actin.

Remaining all are correct.

When action potential moves down to the neuron , acetylcholine relesed from the motor neuron.Action potential moves down the t- tubule, calcium is released from sarcoplasmic reticulum.calicim binds to calmadulin in smooth muscle contraction.The released calcium from the sarcoplasmic reticulum binds to the troponin.when Calcium binds to troponin it removes the tropomysoin from actin and expose the binding site of myosin on actin.The actin mysoin cross bridge cycle starts.