Module 2 Muscle Anatomy and Contraction

Question 1

What role does the sarcolemma play within the excitation-contaction coupling process?

A) Releases calcium into the sarcoplasm
B) Propogation of the action potential along the muscle fiber/cell membrane.
C) Responsible for binding myosin heads to actin.

Answer 1

B) Propogation of the action potential along the muscle fiber/cell membrane.

Question 2

In general, as the number of sarcomeres arranged in series increases in a muslce fiber, so will the overall?

A) velocity producing capacity
B) force producing capacity

Answer 2

A) velocity producing capacity

Question 3

The size principle suggest that

A) neurons with larger cell bodies will preferentially be recruited first during maximal contractions.
B) neurons with smaller cell bodies will be recruited before and more frequently than neurons with larger
cell bodies.

Answer 3

B) neurons with smaller cell bodies will be recruited before and more frequently than neurons with larger
cell bodies.

Question 4

Which muscle fiber type accrues more relative force at lower stimulation frequencies?

A) Type 2b
B) Type 2a
C) Type 1

Answer 4

C) Type 1

Question 5

How does the sarcoplasmic reticulum influence relaxation time of a muscle twitch?

A) The sarcoplasmic reticulum does not influence the muscle twitch.
B) Fibers with a larger sarcoplasmic reticulum will have a faster twitch relaxation time. Due to faster
reuptake of calcium.

Answer 5

B) Fibers with a larger sarcoplasmic reticulum will have a faster twitch relaxation time. Due to faster
reuptake of calcium.

Question 6

Smaller motor units keep firing even once larger motor units are recruited?
FALSE
TRUE

Answer 6

TRUE

Question 7

Fasicles are composed of:

A) myofibrils
B) muscle fibers
C) sarcomeres
D) thick and thin myofilaments (e.g. Actin and Myosin)

Answer 7

B) muscle fibers

Question 8

Muscle fibers/cells are composed of:

A) muscle fibers
B) sarcomeres
C) myofibrils
D) thick and thin myofilaments (e.g. Actin and Myosin)

Answer 8

C) myofibrils

Question 9

Myofibrils are composed of:

A) sarcomeres
B) muscle fibers
C) thick and thin myofilaments (e.g. Actin and Myosin)
D) myofibrils

Answer 9

A) sarcomeres

Question 10

Sarcomeres are composed of:

A) sarcomeres
B) muscle fibers
C) myofibrils
D) thick and thin myofilaments (e.g. Actin and Myosin)

Answer 10

D) thick and thin myofilaments (e.g. Actin and Myosin)