Question 1

What is the role of myosin phosphatase?

Accepted Answer

A)   can rapidly develop action potentials
B)   shallow invaginations of cell membrane
C)   relatively constant tension maintained for a period of time
D)   intracellular cytoskeleton
E)   enzyme that removes phosphate from myosinF) A) and B)
G) A) and D)

Question 2

In order for muscle relaxation to occur,

Accepted Answer

A)   calcium ions must be transported to troponin.
B)   power strokes slow down.
C)   the active sites on actin must be blocked.
D)   sodium ions must be actively transported to troponin.
E)   the active sites on myosin must be uncovered.F) A) and C)
G) A) and D)

Question 3

T tubules

Accepted Answer

A)   provide nutrients to the muscle fiber.
B)   generate new muscle fibers.
C)   conduct action potentials deep into the muscle cell.
D)   release acetylcholine.
E)   store calcium ions.F) A) and D)
G) C) and D)

Question 4

Tetanus of muscles is described as

Accepted Answer

A)   action potential frequency is high enough that no relaxation of muscle fibers occurs.
B)   a muscle produces constant tension during contraction.
C)   a muscle produces an increasing tension during contraction.
D)   a muscle produces increasing tension as it shortens.
E)   a muscle produces tension, but the length of the muscle is increasing.F) D) and E)
G) None of the above

Question 5

A lack of glycolytic enzymes within skeletal muscle cells would impair which type of ATP-yielding process?

Accepted Answer

A)   anaerobic respiration
B)   aerobic respiration
C)   both anaerobic and aerobic respirationD) B) and C)
E) All of the above

Question 6

What is a triad?

Accepted Answer

A)   a protein found along the groove of the F-actin double helix
B)   a T tubule and two adjacent terminal cisternae
C)   the combination of myosin heads with active sites on actin molecules
D)   the movement of myosin head while attached to actin myofilament
E)   after exercise, the oxygen taken in that exceeds the oxygen required for resting metabolismF) A) and C)
G) C) and E)

Question 7

If sodium ions cannot enter a muscle fiber in response to a stimulus,

Accepted Answer

A)   contraction cannot occur.
B)   relaxation cannot occur.
C)   sodium ions will be released from the sarcoplasmic reticulum instead.
D)   the active sites are left exposed.
E)   the action potential travels into the muscle anyway.F) None of the above
G) All of the above

Question 8

-What does "B" represent on the diagram?

Accepted Answer

A)   threshold
B)   depolarization
C)   depolarization phase of action potential
D)   repolarization phase of action potentialE) A) and B)
F) C) and D)

Question 9

Which of the following is NOT an age related change in skeletal muscle?

Accepted Answer

A)   loss of muscle strength
B)   loss of synapse surface area
C)   loss of fast-twitch fibers
D)   decreased recovery time
E)   decrease in motor unitsF) A) and E)
G) C) and E)

Question 10

Multiunit smooth muscle is located in the

Accepted Answer

A)   gastrocnemius.
B)   wall of the GI tract.
C)   wall of blood vessels.
D)   wall of the heart.
E)   reproductive system.F) C) and D)
G) A) and B)

Question 11

Muscle hypertrophy results from increased numbers of

Accepted Answer

A)   myofibrils and sarcomeres.
B)   muscle fibers.
C)   motor units.
D)   muscles.
E)   muscle cells.F) B) and D)
G) B) and E)

Question 12

An eccentric contraction is described as

Accepted Answer

A)   action potential frequency is high enough that no relaxation of muscle fibers occurs.
B)   a muscle produces constant tension during contraction.
C)   a muscle produces an increasing tension during contraction.
D)   a muscle produces increasing tension as it shortens.
E)   a muscle produces tension, but the length of the muscle is increasing.F) D) and E)
G) None of the above

Question 13

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 B)
G) C) and E)

Question 14

Too much acetylcholinesterase causes

Accepted Answer

A)   continuous stimulation of the muscle fiber.
B)   rapid degradation of acetycholine.
C)   voltage-gated calcium ion channels opening in the presynaptic terminal.
D)   an increase in sodium uptake by the muscle fiber.
E)   exocytosis of synaptic vesicles.F) B) and D)
G) B) and E)

Question 15

A condition in which stimuli occur so rapidly that there are no intervening relaxations between contractions is called

Accepted Answer

A)   complete tetanus.
B)   incomplete tetanus.
C)   involuntary paralysis.
D)   all or none tetanus.
E)   treppe.F) B) and D)
G) B) and E)

Question 16

A waste product of anaerobic respiration in muscle cells is

Accepted Answer

A)   uric acid.
B)   hydrochloric acid.
C)   lactic acid.
D)   carbonic acid.
E)   pyruvic acid.F) A) and B)
G) A) and E)

Question 17

During the contraction phase of a muscle twitch,

Accepted Answer

A)   acetylcholine stimulates the pre-synaptic terminal.
B)   sodium ions diffuse into the muscle fiber.
C)   actin-myosin cross-bridges form.
D)   calcium ions are transported back to the sarcoplasmic reticulum.
E)   the action potential travels down the T tubule.F) B) and C)
G) C) and D)

Question 18

Functionally, smooth muscle

Accepted Answer

A)   is well adapted to anaerobic metabolism.
B)   exhibits autorhythmic contractions.
C)   contracts in response to slow increases in length.
D)   is unable to maintain tone.
E)   rapidly develops an oxygen debt.F) A) and B)
G) A) and C)

Question 19

Inflammation of the fibrous connective tissue resulting in stiffness and soreness is

Accepted Answer

A)   cramps.
B)   fibrositis.
C)   fibrosis.
D)   muscular dystrophy.
E)   paralysis.F) A) and D)
G) A) and B)

Question 20

When skeletal muscle is producing carbon dioxide and water while making ATP, which chemical processes could be active at this time?

Accepted Answer

A)   anaerobic respiration
B)   aerobic respiration
C)   both anaerobic and aerobic respirationD) A) and B)
E) None of the above

Exam 9: Muscular System: Histology and Physiology

A condition in which stimuli occur so rapidly that there are no intervening relaxations between contractions is called

Correct AnswerverifiedShow Answer

Multiunit smooth muscle is located in the

Correct AnswerverifiedShow Answer

Tetanus of muscles is described as

Correct AnswerverifiedShow Answer

During the contraction phase of a muscle twitch,

Correct AnswerverifiedShow Answer

If sodium ions cannot enter a muscle fiber in response to a stimulus,

Correct AnswerverifiedShow Answer

In order for muscle relaxation to occur,

Correct AnswerverifiedShow Answer

An eccentric contraction is described as

Correct AnswerverifiedShow Answer

Inflammation of the fibrous connective tissue resulting in stiffness and soreness is

Correct AnswerverifiedShow Answer

A waste product of anaerobic respiration in muscle cells is

Correct AnswerverifiedShow Answer

What is the role of myosin phosphatase?

Correct AnswerverifiedShow Answer

T tubules

Correct AnswerverifiedShow Answer

A lack of glycolytic enzymes within skeletal muscle cells would impair which type of ATP-yielding process?

Correct AnswerverifiedShow Answer

-What does "B" represent on the diagram?

Correct AnswerverifiedShow Answer

What is a triad?

Correct AnswerverifiedShow Answer

Which of the following is NOT an age related change in skeletal muscle?

Correct AnswerverifiedShow Answer

Muscle hypertrophy results from increased numbers of

Correct AnswerverifiedShow Answer

Functionally, smooth muscle

Correct AnswerverifiedShow Answer

Too much acetylcholinesterase causes

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

When skeletal muscle is producing carbon dioxide and water while making ATP, which chemical processes could be active at this time?

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