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ESS 345 MIDTERM EXAM QUESTIONS AND ANSWERS VERIFIED

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ESS 345 MIDTERM EXAM QUESTIONS AND ANSWERS VERIFIED What is the basic unit of contraction in Skeletal Muscle? Sarcomere Myofibril is ___________ of muscle fiber. Component At rest, ___________ is stored in the SR and release by action potential to bind to ___________ for muscle contraction. ...

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  • November 7, 2024
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  • 2024/2025
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ESS 345 MIDTERM EXAM QUESTIONS AND

ANSWERS VERIFIED


What is the basic unit of contraction in Skeletal Muscle?

Sarcomere

Myofibril is ___________ of muscle fiber.

Component

At rest, ___________ is stored in the SR and release by action potential to bind to

___________ for muscle contraction.

Calcium; troponin

At rest, cross-bridge interaction between actin and myosin in skeletal muscle is

directly blocked by __________.

tropomyosin

What is it the tilting action of the head called when the myosin head pulls the thin

filament toward the center of the sarcomere?

Power Stroke

When a muscle fiber is stimulated so ________, that muscle fiber is not allowed to

relax between stimulations, resulting in a smooth and sustained contraction. This

phenomenon is called _____________.

Rapidly; tetanus

A motor unit refers to ___________.

A. a single motor neuron plus all of the muscle fibers it innervates

,B. a single muscle fiber plus all of the motor neurons that innervate it

C. all of the motor neuron supplying a single muscle

D. a pair of antagonist muscle.

A. a single motor neuron plus all of th emuscle fibers it innervates

If you wanted to pick up something heavier than your pencil, you would need to

have a stronger muscle contraction. In what way might you accomplish this?

A. stimulate more motor units

B. Decrease the frequency of stimulation to allow a more prolonged contraction

to occur.

C. Block acetylcholinesterase at the neuromuscular junction to allow

acetylcholine to function longer

D. None of the above is correct

A. Stimulate more motor units

If you want to hold a very heavy dumbbell to show your friends how strong you

are, you want to select the best joint angle ____________.

A. where muscle length is optimal

B. where energy supply is optimal

C. where leverage is maximal

D. A + B

E. A + C

E. A + C

- where muscle length is optimal

- where leverage is maximal

, What type of fibers are typically engaged during short, higher-intensity exercise

that involves some degree of endurance?

Type IIa

What type of fibers are not very easily stimulated by the nervous system,

meaning that they typically are not engaged until all other fiber types have been

stimulated first.

Type IIx

Which process is a transition from glycolysis to the Krebs Cycle?

A. Acetyl-CoA Formation

B. Conversion of PGASL to PGA

C. Regeneration of reduced NAD+

D. Oxidative Phosphorylation

A. Acetyl-CoA Formation

Under maximal effort, phosphocreatine (PCr) can provide enough energy to

synthesize ATP for ______________.

A. about 10 seconds

B. 30-45 seconds

C. 1-3 minutes

D. 3-6 minutes

A. about 10 seconds

Among 3 bioenergetic system, the greatest number of ATP molecules is

produced where?

The Electron Transport Chain

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