Question 1

The training regimen of a competitive weight lifter is designed partly to __________.

Accepted Answer

A)  convert certain parallel muscles into stronger pennate muscles
B)  increase the average number of myofibrils per muscle fiber
C)  convert white muscle tissue to red muscle
D)  increase the size of his motor units
E)  lower the threshold for muscle excitationF) B) and C)
G) A) and E)

Question 2

Why is the contraction strength of smooth muscle relatively independent of its resting length?

Accepted Answer

A)  It gets nearly all of its Ca2+ from the extracellular fluid.
B)  It does not have intercalated discs.
C)  It does not have sarcomeres.
D)  It is regulated by a length-tension relationship.
E)  It is involuntary muscle.F) A) and C)
G) A) and E)

Question 3

Where would you expect to find numerous gap junctions in muscular tissue?

Accepted Answer

A)  The sarcoplasmic reticulum of skeletal muscle
B)  The A bands of skeletal and cardiac muscle
C)  The sarcolemma of skeletal muscle
D)  The intercalated discs of cardiac muscle
E)  Multiunit smooth muscleF) A) and E)
G) C) and D)

Question 4

The sarcolemma of a resting muscle fiber is most permeable to __________.

Accepted Answer

A)  calcium
B)  potassium
C)  sodium
D)  lithium
E)  magnesiumF) A) and B)
G) D) and E)

Question 5

Which muscle type depends solely on the sarcoplasmic reticulum as its calcium source?

Accepted Answer

A)  Skeletal muscle
B)  Smooth muscle
C)  Cardiac muscle
D)  Skeletal and smooth muscle
E)  Smooth and cardiac muscleF) B) and D)
G) None of the above

Question 6

Which of the following marks the boundaries of a sarcomere?

Accepted Answer

A)  I bands
B)  H bands
C)  Z discs
D)  M lines
E)  A bandsF) A) and B)
G) A) and C)

Question 7

80% of the lactic acid produced by skeletal muscle is converted to pyruvic acid by the __________.

Accepted Answer

A)  kidneys
B)  liver
C)  muscle tissue
D)  sarcoplasmic reticulum
E)  neuromuscular junctionF) A) and D)
G) A) and C)

Question 8

Which of the following is an accurate comparison of skeletal muscle to smooth muscle?

Accepted Answer

A)  Smooth muscle contracts more slowly but relaxes more rapidly.
B)  Smooth muscle contracts more rapidly but relaxes more slowly.
C)  Smooth muscle contracts and relaxes more slowly.
D)  Smooth muscle consumes more ATP to maintain a given level of muscle tension.
E)  Smooth muscle depends on a nerve fiber to supply the calcium needed for contraction.F) A) and E)
G) D) and E)

Question 9

Which of the following would be caused by a contraction of smooth muscle?

Accepted Answer

A)  Goose bumps
B)  Blood leaving the left ventricle of the heart
C)  Elevating the eyebrows
D)  Blinking the eyelids
E)  Deep inspirationF) A) and D)
G) B) and E)

Question 10

A dark band formed by parallel thick filaments that partly overlap the thin filaments is known as an H band.

Accepted Answer

A) True 
 B)False

Question 11

When acetylcholinesterase outlasts the release of acetylcholine from the synaptic vesicles,the skeletal muscle __________.

Accepted Answer

A)  contracts
B)  gets stronger
C)  relaxes
D)  releases Ca++
E)  opens its Na+ channelsF) C) and D)
G) B) and D)

Question 12

The transfer of phosphate from CP to ADP is catalyzed by __________.

Accepted Answer

A)  myokinase
B)  creatinine
C)  cAMP
D)  creatine kinase
E)  ATPF) D) and E)
G) A) and D)

Question 13

Clinically,dystrophin is the most important noncontractile protein to occur in muscle fibers.

Accepted Answer

A) True 
 B)False

Question 14

A skeletal muscle generates the greatest tension when it is __________.

Accepted Answer

A)  greatly stretched before being stimulated
B)  partially stretched before being stimulated
C)  fully relaxed before being stimulated
D)  well-rested and low in creatine phosphate
E)  high in lactic acid concentrationF) B) and C)
G) None of the above

Question 15

Shortening a muscle while it maintains constant tension is called __________.

Accepted Answer

A)  complete tetanus
B)  incomplete tetanus
C)  an isokinetic contraction
D)  an isometric contraction
E)  an isotonic contractionF) C) and D)
G) B) and C)

Question 16

Extensibility refers to the ability of a muscle to stretch.

Accepted Answer

A) True 
 B)False

Question 17

Which of the following contains overlapping thick and thin filaments?

Accepted Answer

A)  A band
B)  H band
C)  I band
D)  M line
E)  Z discsF) C) and D)
G) A) and D)

Question 18

The synaptic knob releases acetylcholine into the synaptic cleft,which is received by receptors on the motor end plate.Which structure does this describe?

Accepted Answer

A)  A sarcomere
B)  The thick filament
C)  The varicosity of a smooth muscle cell
D)  The neuromuscular junction of a skeletal muscle
E)  A motor unitF) All of the above
G) C) and D)

Question 19

What happens when acetylcholine stimulates its receptors in the neuromuscular junction?

Accepted Answer

A)  The release of Ca2+ from the sarcoplasmic reticulum decreases.
B)  The permeability of the sarcolemma to Na+ increases.
C)  The positive charge on the sarcolemma decreases.
D)  The threshold of the muscle fiber lowers.
E)  The inhibitory effect of acetylcholinesterase is overridden.F) B) and D)
G) A) and D)

Question 20

A myofilament that runs throught the core of a thick filament and anchors it to a Z disc is called a(n) __________.

Accepted Answer

A)  myofibril
B)  thin filament
C)  T tubule
D)  sarcolemma
E)  elastic filamentF) A) and E)
G) B) and E)

Exam 11: Muscular Tissue

When acetylcholinesterase outlasts the release of acetylcholine from the synaptic vesicles,the skeletal muscle __________.

Correct AnswerverifiedShow Answer

Why is the contraction strength of smooth muscle relatively independent of its resting length?

Correct AnswerverifiedShow Answer

What happens when acetylcholine stimulates its receptors in the neuromuscular junction?

Correct AnswerverifiedShow Answer

Which of the following contains overlapping thick and thin filaments?

Correct AnswerverifiedShow Answer

Extensibility refers to the ability of a muscle to stretch.

Correct AnswerverifiedShow Answer

The training regimen of a competitive weight lifter is designed partly to __________.

Correct AnswerverifiedShow Answer

A myofilament that runs throught the core of a thick filament and anchors it to a Z disc is called a(n) __________.

Correct AnswerverifiedShow Answer

80% of the lactic acid produced by skeletal muscle is converted to pyruvic acid by the __________.

Correct AnswerverifiedShow Answer

Shortening a muscle while it maintains constant tension is called __________.

Correct AnswerverifiedShow Answer

Which of the following would be caused by a contraction of smooth muscle?

Correct AnswerverifiedShow Answer

The transfer of phosphate from CP to ADP is catalyzed by __________.

Correct AnswerverifiedShow Answer

The sarcolemma of a resting muscle fiber is most permeable to __________.

Correct AnswerverifiedShow Answer

Which of the following marks the boundaries of a sarcomere?

Correct AnswerverifiedShow Answer

Where would you expect to find numerous gap junctions in muscular tissue?

Correct AnswerverifiedShow Answer

Which of the following is an accurate comparison of skeletal muscle to smooth muscle?

Correct AnswerverifiedShow Answer

The synaptic knob releases acetylcholine into the synaptic cleft,which is received by receptors on the motor end plate.Which structure does this describe?

Correct AnswerverifiedShow Answer

Which muscle type depends solely on the sarcoplasmic reticulum as its calcium source?

Correct AnswerverifiedShow Answer

A skeletal muscle generates the greatest tension when it is __________.

Correct AnswerverifiedShow Answer

Clinically,dystrophin is the most important noncontractile protein to occur in muscle fibers.

Correct AnswerverifiedShow Answer

A dark band formed by parallel thick filaments that partly overlap the thin filaments is known as an H band.

Correct AnswerverifiedShow Answer

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