64) The story below describes the process by which a skeletal muscle cell contra

Question

64) The story below describes the process by which a skeletal muscle cell contracts, generates force, and relaxes. Using the table below, fill in the missing words with the best and most technical termis). TIP: Take your time and double- check that your chosen word(s) fit into the overall context of their sentence. (12 points) The neurotransmitter _A, which always excites a muscle cell, is released through the process of 8 at the axon terminal of a_C neuron. This release happens at a specialized region called the D that includes branching axon terminals that contact one or more muscle fibers and a Schwann cell sheath. The neurotransmitter diffuses across the synaptic cleft and binds to _E receptors (be specific). These F-gated channels, allow_G influx and _H efflux, which ultimately causes a depolarization in the muscle cell, specifically called a(n) L. This depolarization always triggers an electrical signal called a(n) at channels (be specific) located on the . This electrical signal then travels down the M that extend into the interior of the muscle fiber. When the electrical signal reaches the voltage-sensitive N, these proteins will change shape, physically tug on, and open O_ located on the P.a subregion of the sarcoplasmic reticulum. These channels inside the muscle cell will release ions, which in turn bind to the protein- (be specific). This protein physically pulls S away from binding sites on t . The (be specific) can then bind to the thin filament, release , and produce its action, called the w . This action causes the thin filament to slide over the thick filament, thus causing the sarcomere to decrease in length and force to be generated. When stimulation of the muscle cell ceases, will actively remove the intracellular signal ion from the sarcoplasm and transport it back into the sarcoplasmic reticulum. x. /20

Explanation / Answer

A) acetyl choline

B) exocytosis

C)presynaptic neuron

D) neuromuscular junction

E) nicotinic or muscarinic receptors.

F)Voltage

G) sodium

H)potassium

I) end plate potential.

J) action potential

K) Calcium channels

L) sarcolemma

M)sarcoplasmic reticulumn

N) calcium channels

O) Dihydropyridine receptors

P) longitudinal sarcoplasmic reticulumn

Q) calcium

R) troponin C

S) tropomyosin

T) actin

U) myosin

V) energy

W) Muscular contraction/ activation of sliding filament system

X) Calcium- magnesium ATPase.

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