Question 1

Which of the following is NOT true of the latch state of smooth muscle contraction?

Accepted Answer

A)   Myosin phosphatase removes the phosphate group from myosin.
B)   It explains why smooth muscle can sustain tension for long periods of time.
C)   It occurs when the phosphate is removed while the cross-bridges are attached to actin.
D)   It occurs when the phosphate is removed while the cross-bridges are not attached to actin.
E)   It allows contraction without a large energy expenditure.F) A) and B)
G) C) and D)

Question 2

Which of the following connective tissue layers is outside all the others?

Accepted Answer

A)   Perimysium
B)   Endomysium
C)   Epimysium
D)   Paramysium
E)   SarcolemmaF) A) and E)
G) B) and D)

Question 3

Myosin is also known as the

Accepted Answer

A)   thick myofilament.
B)   thin myofilament.
C)   intermediate myofilament.
D)   short myofilament.
E)   sarcomere.F) A) and D)
G) A) and E)

Question 4

-The figure illustrates a detailed drawing of the neuromuscular junction. What does "A" represent?

Accepted Answer

A)   Synaptic vesicles
B)   Synaptic cleft
C)   Sarcolemma
D)   Presynaptic terminal
E)   Postsynaptic membraneF) None of the above
G) A) and C)

Question 5

The refractory period

Accepted Answer

A)   is the time during which the tissue cannot respond again.
B)   results in complete and incomplete tetanus.
C)   is the condition in which the muscle fiber only partially relaxes between contractions.
D)   is the condition in which stimuli occur so rapidly that there are no intervening relaxations.
E)   is the constant tension produced by muscles for long periods of time.F) A) and C)
G) A) and B)

Question 6

A sustained muscle contraction is known as ________.

Accepted Answer

A)   tetanus
B)   tone
C)   treppe
D)   twitch
E)   paralysisF) B) and E)
G) A) and D)

Question 7

Which of the following statements concerning fast-twitch muscle fibers is true?

Accepted Answer

A)   They split ATP rapidly.
B)   They have large deposits of myoglobin.
C)   They are well adapted to aerobic metabolism.
D)   They have a well-developed blood supply.
E)   They have many mitochondria.F) B) and D)
G) D) and E)

Question 8

Which of the following is true?

Accepted Answer

A)   The greater the overlap of actin and myosin, the stronger the contraction.
B)   Overstretching a muscle will increase its tension.
C)   Optimal actin and myosin overlap will produce maximal contraction.
D)   The greatest amount of tension is achieved when actin and myosin do not overlap.
E)   Tension is great when actin and myosin overlap as much as they can.F) A) and E)
G) C) and E)

Question 9

A volleyball player depends on the gastrocnemius muscles for plantar flexion, whereas a marathon runner depends more on the soleus muscles for the same action. What characteristic of the soleus muscles makes this so?

Accepted Answer

A)   They have smaller mitochondria.
B)   They have more glycogen in them.
C)   They don't have as many blood capillaries per gram of tissue.
D)   They make more use of aerobic respiration.
E)   They break ATP down to ADP and Pi faster.F) D) and E)
G) C) and E)

Question 10

-What does "A" represent on the diagram?

Accepted Answer

A)   Myosin myofilament
B)   Actin myofilament
C)   Sarcomere
D)   Z disk
E)   Cross-bridgeF) None of the above
G) All of the above

Question 11

Aerobic exercise

Accepted Answer

A)   increases vascularity of muscle.
B)   develops fatigue-resistant fast-twitch fibers.
C)   can increase the efficiency of slow-twitch fibers.
D)   can increase the number of mitochondria in muscle fibers.
E)   All of these choices are correct.F) C) and D)
G) A) and E)

Question 12

Which type of muscle tissue possesses striations?

Accepted Answer

A)   Skeletal muscle
B)   Smooth muscle
C)   Cardiac muscle
D)   Both skeletal and cardiac muscle are correct.
E)   Both cardiac and smooth muscle are correct.F) C) and D)
G) B) and D)

Question 13

In order for excitation-contraction coupling to occur, the production of an action potential must occur within the ________ of a muscle fiber.

Accepted Answer

A)   contraction
B)   junction
C)   sarcolemmaD) All of the above
E) A) and C)

Question 14

Aerobic respiration

Accepted Answer

A)   produces ATP molecules faster than anaerobic respiration.
B)   yields as many as 36 ATP per glucose molecule metabolized.
C)   occurs whether oxygen is present or not.
D)   occurs entirely in the cytoplasm.
E)   occurs in the ribosomes.F) A) and B)
G) A) and C)

Question 15

Alex is participating in a 50-meter dash. Predict the most important chemical process his muscles will rely on during this race.

Accepted Answer

A)   Aerobic respiration
B)   Anaerobic respiration
C)   Creatine phosphate breakdown
D)   Nuclear reactions
E)   Both anaerobic respiration and creatine phosphate breakdown are correct.F) None of the above
G) B) and E)

Question 16

Hypertrophy of skeletal muscles from weight lifting is caused by an increase in the

Accepted Answer

A)   number of muscle fibers.
B)   size of muscle fibers.
C)   number of striations.
D)   number of nuclei within the muscle fibers.
E)   number of muscle cells.F) A) and E)
G) C) and E)

Question 17

Which of the following individuals would have more mitochondria in her skeletal muscle?

Accepted Answer

A)   A 50-year-old sedentary computer programmer
B)   A 22-year-old soccer player
C)   A long-term hospice patient
D)   A model on a reduced-calorie diet
E)   A newbornF) C) and D)
G) B) and E)

Question 18

A proper definition of muscle tone is

Accepted Answer

A)   constant tension produced by muscles for long periods of time.
B)   a feeling of well-being following exercise.
C)   the ability of a muscle to maintain a contraction against an outside force.
D)   muscles contracting together.
E)   warm-up of muscle tissue.F) All of the above
G) A) and B)

Question 19

Which of the following describes titin's roles in muscle contraction? (Check all that apply.)

Accepted Answer

A)   Accounts for muscle's excitability
B)   Accounts for muscle's extensibility and elasticity
C)   Allows the sarcomere to recoil and stretch
D)   Helps to hold the actin myofilaments in positionE) A) and B)
F) B) and C)

Question 20

A muscle fiber will respond to a stimulus when that stimulus reaches the ________ level.

Accepted Answer

A)   threshold
B)   relaxation
C)   rigor mortis
D)   recruitment
E)   restingF) B) and D)
G) C) and D)

Exam 9: Muscular System: Histology and Physiology

Aerobic respiration

Correct AnswerverifiedShow Answer

The refractory period

Correct AnswerverifiedShow Answer

Which of the following connective tissue layers is outside all the others?

Correct AnswerverifiedShow Answer

Which of the following individuals would have more mitochondria in her skeletal muscle?

Correct AnswerverifiedShow Answer

In order for excitation-contraction coupling to occur, the production of an action potential must occur within the ________ of a muscle fiber.

Correct AnswerverifiedShow Answer

Which type of muscle tissue possesses striations?

Correct AnswerverifiedShow Answer

Which of the following describes titin's roles in muscle contraction? (Check all that apply.)

Correct AnswerverifiedShow Answer

Alex is participating in a 50-meter dash. Predict the most important chemical process his muscles will rely on during this race.

Correct AnswerverifiedShow Answer

-The figure illustrates a detailed drawing of the neuromuscular junction. What does "A" represent?

Correct AnswerverifiedShow Answer

A sustained muscle contraction is known as ________.

Correct AnswerverifiedShow Answer

Which of the following statements concerning fast-twitch muscle fibers is true?

Correct AnswerverifiedShow Answer

A proper definition of muscle tone is

Correct AnswerverifiedShow Answer

Which of the following is NOT true of the latch state of smooth muscle contraction?

Correct AnswerverifiedShow Answer

A volleyball player depends on the gastrocnemius muscles for plantar flexion, whereas a marathon runner depends more on the soleus muscles for the same action. What characteristic of the soleus muscles makes this so?

Correct AnswerverifiedShow Answer

Myosin is also known as the

Correct AnswerverifiedShow Answer

Hypertrophy of skeletal muscles from weight lifting is caused by an increase in the

Correct AnswerverifiedShow Answer

Which of the following is true?

Correct AnswerverifiedShow Answer

A muscle fiber will respond to a stimulus when that stimulus reaches the ________ level.

Correct AnswerverifiedShow Answer

Aerobic exercise

Correct AnswerverifiedShow Answer

-What does "A" represent on the diagram?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified