Unit 1 Quiz Questions

Question 1

What subpopulation of muscle mitochondria are highly involved in providing energy to reestablish surface resting membrane potentials?

Answer 1

Subsarcolemmal

Question 2

Which of the following describes a characteristic of muscle fiber nuclei?

A. Although nuclei are distributed throughout the muscle fiber, very few are located in the motor end-plate region

B. Multiple nuclei dispersed between the plasmalemma and the basement membrane

C. One single, centrally located nucleus per muscle fiber

D. Multiple nuclei dispersed along the inner surface of the plasmalemma

Answer 2

Not A

Question 3

Which of the following is a characteristic of the transverse tubules (T-tubules)?
Group of answer choices

A. Conducts impulses from muscle fiber surface to interior

B. Involved in taking up cytosolic calcium during muscle relaxation

C. Lies parallel to the muscle fibers long axis

D. Form small opening in the mitochondrial membrane

Answer 3

Not C

Question 4

At the end of a muscle near the tendon, which of the following is true?
Group of answer choices

A. The actin protein connects with the plasmalemma through attachment proteins such as vinculin and talin

B. The myosin filament fuses directly with the plasmalemma

C. The actin protein connects with the plasmalemma through attachment proteins such as myosin light chain

D. The actin protein fuses directly with the plasmalemma

Answer 4

A. The actin protein connects with the plasmalemma through attachment proteins such as vinculin and talin

Question 5

Which of the following is associated with the structure of the sarcoplasmic reticulum?
A. Ryanodine receptors
B. Adenylate cyclase
C. Troponin C
D. Tropomyosin

Answer 5

A. Ryanodine receptors

Question 6

Which of the following best describes the function of the sarco-endoplasmic reticulum calcium ATPase (SERCA)?
A. Calcium release channel on sarcoplasmic reticulum
B. Calcium binding site on thin filament
C. Calcium pump on sarcoplasmic reticulum
D. Calcium pump on plasmalemma

Answer 6

Not A.

Question 7

Titin

Answer 7

Muscle protein that connects thick filaments to the Z disk

Question 8

Muscle proteins such as spectrin, dystophin, and desmin are associated with what component of the muscle fiber?
A. The perimysium
B. The cytoskeleton
C. The transverse tubule system (T-tubules)
D. The sarcoplasmic reticulum

Answer 8

B. The Cytoskeleton

Question 9

Which of the following is associated with the muscle fiber basement membrane?
A. Dihydropyradine receptors (DHPR)
B. Acetylcholine (ACh)
C. Titin
D. Acetylcholinesterase (AChE)

Answer 9

Not A.

Question 10

Basement Membrane

Answer 10

A glycoprotein complex surround a muscle fiber lying between the plasmalemma and endomysium

Question 11

Perimysium

Answer 11

A tough relatively thick coat that divides the muscle into fascicles and acts as a passage for blood vessels and nerves.