Question 1

When a skeletal muscle fiber is at rest, there is more sodium outside the cell as compared to the sarcoplasm.

Accepted Answer

A) True 
 B)False

Question 2

A motor unit within the powerful quadriceps muscle would

Accepted Answer

A)   contain several motor neurons.
B)   be much like those in the eye muscles.
C)   generally contain less than ten fibers.
D)   generally contain several hundred fibers.E) C) and D)
F) A) and C)

Question 3

Select all that are true when a muscle fiber is at rest.

Accepted Answer

A)   There is a charge difference across the sarcolemma.
B)   Sodium-potassium pumps are active.
C)   Calcium is stored in the sarcoplasm.
D)   ACh receptors are open.E) None of the above
F) A) and B)

Question 4

Glycolytic muscle fibers tend to be very rich in myoglobin and mitochondria.

Accepted Answer

A) True 
 B)False

Question 5

In the hierarchy of skeletal muscle fiber components, the myofibril is made up of myofilaments.

Accepted Answer

A) True 
 B)False

Question 6

Which structures are reservoirs that store acetylcholine?

Accepted Answer

A)   Synaptic vesicles
B)   Synaptic clefts
C)   Terminal cisternae
D)   Lysosomes
E)   SarcomeresF) D) and E)
G) C) and D)

Question 7

Smooth muscle tissue in which cells are individually sent signals to contract (rather than contracting in unison)  is referred to as

Accepted Answer

A)   single-unit.
B)   multiunit.C) A) and B)
D) undefined

Question 8

The net energy yield from one glucose molecule through the process of glycolysis is

Accepted Answer

A)   2 ATP.
B)   6 ATP.
C)   30 ATP.
D)   36 ATP.E) All of the above
F) C) and D)

Question 9

Similar to skeletal muscle cells, all smooth muscle cells are excited by ACh.

Accepted Answer

A) True 
 B)False

Question 10

The contraction phase of a muscle twitch has a shorter duration than the relaxation phase.

Accepted Answer

A) True 
 B)False

Question 11

For relaxation to occur,

Accepted Answer

A)   ACh receptors close and Ca++ channels on the sarcoplasmic reticulum close.
B)   ACh receptors close and Ca++ channels on the sarcoplasmic reticulum open.
C)   ACh receptors open and Ca++ channels on the sarcoplasmic reticulum close.
D)   ACh receptors open and Ca++ channels on the sarcoplasmic reticulum open.E) C) and D)
F) B) and D)

Question 12

Myosin light-chain phosphatase is an enzyme that dephosphorylates the myosin heads in smooth muscle, which stops ATPase activity and fosters relaxation of smooth muscle.

Accepted Answer

A) True 
 B)False

Question 13

Which are possible functions of skeletal muscles?
A: Maintenance of posture
B: Both highly coordinated and localized simple movements
C: Temperature regulation
D: Support of certain body organs
E: Regulation of the movement of material through certain body tracts

Accepted Answer

A)   a, b, e
B)   a, b, c
C)   a, b, c, e
D)   a, b, c, d
E)   a, b, c, d, eF) A) and B)
G) A) and E)

Question 14

The type of muscle fibers that have only a single nucleus, both thick and thin filaments, but no Z discs, are

Accepted Answer

A)   skeletal.
B)   cardiac.
C)   smooth.
D)   cardiac and smooth.
E)   cardiac and skeletal.F) A) and E)
G) B) and C)

Question 15

Satellite cells are multinucleate.

Accepted Answer

A) True 
 B)False

Question 16

In general, a muscle's resting length is its optimal length for force generation.

Accepted Answer

A) True 
 B)False

Question 17

An increase in the size of a muscle fiber is called ________.

Accepted Answer

The answer of An increase in the size of a...

Question 18

Release of crossbridges and a decline in muscle tension characterize the ________ period of a twitch.

Accepted Answer

A)   contraction
B)   latent
C)   relaxationD) All of the above
E) None of the above

Question 19

Which contraction occurs when you try (unsuccessfully)  to move a wall?

Accepted Answer

A)   Isometric
B)   IsotonicC) A) and B)
D) undefined

Question 20

On a muscle fiber, the two terminal cisternae and the centrally placed T-tubule form a structure called a ________.

Accepted Answer

The answer of On a muscle fiber, the two terminal...

Exam 10: Muscle Tissue

A motor unit within the powerful quadriceps muscle would

Correct AnswerverifiedShow Answer

An increase in the size of a muscle fiber is called ________.

Correct AnswerverifiedShow Answer

Which structures are reservoirs that store acetylcholine?

Correct AnswerverifiedShow Answer

Which are possible functions of skeletal muscles? A: Maintenance of posture B: Both highly coordinated and localized simple movements C: Temperature regulation D: Support of certain body organs E: Regulation of the movement of material through certain body tracts

Correct AnswerverifiedShow Answer

For relaxation to occur,

Correct AnswerverifiedShow Answer

In the hierarchy of skeletal muscle fiber components, the myofibril is made up of myofilaments.

Correct AnswerverifiedShow Answer

Similar to skeletal muscle cells, all smooth muscle cells are excited by ACh.

Correct AnswerverifiedShow Answer

On a muscle fiber, the two terminal cisternae and the centrally placed T-tubule form a structure called a ________.

Correct AnswerverifiedShow Answer

When a skeletal muscle fiber is at rest, there is more sodium outside the cell as compared to the sarcoplasm.

Correct AnswerverifiedShow Answer

The type of muscle fibers that have only a single nucleus, both thick and thin filaments, but no Z discs, are

Correct AnswerverifiedShow Answer

Glycolytic muscle fibers tend to be very rich in myoglobin and mitochondria.

Correct AnswerverifiedShow Answer

Release of crossbridges and a decline in muscle tension characterize the ________ period of a twitch.

Correct AnswerverifiedShow Answer

The contraction phase of a muscle twitch has a shorter duration than the relaxation phase.

Correct AnswerverifiedShow Answer

Smooth muscle tissue in which cells are individually sent signals to contract (rather than contracting in unison) is referred to as

Correct AnswerverifiedShow Answer

The net energy yield from one glucose molecule through the process of glycolysis is

Correct AnswerverifiedShow Answer

In general, a muscle's resting length is its optimal length for force generation.

Correct AnswerverifiedShow Answer

Which contraction occurs when you try (unsuccessfully) to move a wall?

Correct AnswerverifiedShow Answer

Satellite cells are multinucleate.

Correct AnswerverifiedShow Answer

Myosin light-chain phosphatase is an enzyme that dephosphorylates the myosin heads in smooth muscle, which stops ATPase activity and fosters relaxation of smooth muscle.

Correct AnswerverifiedShow Answer

Select all that are true when a muscle fiber is at rest.

Correct AnswerverifiedShow Answer

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