Question 1

What is tropomyosin?

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 D)
G) D) and E)

Question 2

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) A) and E)
G) All of the above

Question 3

A stimulus either causes an action potential or it doesn't.This is called

Accepted Answer

A)  an all-or-none response.
B)  a graded response.
C)  a latent period response.
D)  a relative refractory response.
E)  an arbitrary response.F) A) and E)
G) B) and E)

Question 4

Identify the statement concerning skeletal muscle that is true.

Accepted Answer

A)  It comprises about 20% of the body's weight.
B)  It propels urine through the urinary tract.
C)  Its function is largely under involuntary control.
D)  It is a kind of connective tissue.
E)  It is responsible for locomotion.F) A) and B)
G) B) and C)

Question 5

Epimysium

Accepted Answer

A)  surrounds individual muscles.
B)  separates muscle fibers.
C)  connects muscles to bone.
D)  is a type of muscle tissue.
E)  is a type of nerve tissue.F) A) and E)
G) C) and D)

Question 6

The condition of painful,spasmodic contractions of muscles is referred to as

Accepted Answer

A)  cramps.
B)  fibrositis.
C)  fibromyalgia.
D)  muscular dystrophy.
E)  paralysis.F) None of the above
G) B) and D)

Question 7

In which of the following situations does a resting membrane potential exist?

Accepted Answer

A)  a relaxed muscle fiber
B)  a conducting neuron
C)  a stimulated sensory receptor in the skin
D)  a contracting cardiac muscle cell
E)  the eye seeing an imageF) A) and E)
G) B) and E)

Question 8

Which of the following statements concerning smooth muscle is true?

Accepted Answer

A)  It contains many sarcomeres.
B)  Caveolae seem to take the place of the myofibrils.
C)  A calcium-calmodulin complex initiates cross-bridge formation.
D)  The cells are large and multinuclear.
E)  It has a well developed sarcoplasmic reticulum.F) C) and D)
G) A) and E)

Question 9

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) All of the above
G) B) and D)

Question 10

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) C) and D)
G) C) and E)

Question 11

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) A) and D)
G) A) and C)

Question 12

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) C) and D)
G) A) and C)

Question 13

When the myosin head flexes into a bend,pulling the actin filament along with it,this is called the

Accepted Answer

A)  action reaction.
B)  power stroke.
C)  recovery stroke.
D)  muscle tone.
E)  action potential.F) None of the above
G) A) and E)

Question 14

Randy is participating in a strong man competition and is required to pull a yacht as far as he can.Which type of chemical process will his skeletal muscles rely on during this competition?

Accepted Answer

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

Question 15

The elevated oxygen consumption relative to activity level after exercise has ended is called

Accepted Answer

A)  oxygen deficit.
B)  oxygen debt.
C)  oxygen repayment.
D)  recovery oxygen consumption.
E)  anaerobic recovery.F) B) and D)
G) B) and C)

Question 16

After contraction has occurred,the calcium is

Accepted Answer

A)  destroyed by cholinesterase.
B)  chemically bound to the cross bridges.
C)  secreted by the Golgi apparatus to the outside of the cell.
D)  released from troponin.
E)  returned to the sarcolemma.F) D) and E)
G) C) and E)

Question 17

Which type of muscle tissue is multinucleated?

Accepted Answer

A)  skeletal muscle
B)  smooth muscle
C)  cardiac muscle
D)  both skeletal and cardiac muscle
E)  both cardiac and smooth muscleF) D) and E)
G) A) and D)

Question 18

Which of the following occurs during recovery from oxygen deficit?

Accepted Answer

A)  an elevated level of anaerobic metabolism
B)  depletion of reserves of creatine phosphate
C)  conversion of excess lactic acid to glucose
D)  glycogen degradation to provide creatine
E)  depressed level of aerobic respirationF) A) and D)
G) B) and E)

Question 19

When repolarization of the cell membrane is complete,the

Accepted Answer

A)  cell dies.
B)  cell regenerates.
C)  cell no longer has a potential difference across its membrane.
D)  cell is no longer responsive.
E)  original polarity of the cell is restored.F) All of the above
G) B) and D)

Question 20

The sites where a chemical substance is transmitted from the presynaptic terminal of an axon to the postsynaptic membrane of a muscle fiber are called

Accepted Answer

A)  neuromuscular junctions.
B)  sarcomeres.
C)  myofilaments.
D)  Z disks.
E)  cell body of neuron.F) A) and B)
G) C) and D)

Exam 9: Muscular System: Histology and Physiology

The sites where a chemical substance is transmitted from the presynaptic terminal of an axon to the postsynaptic membrane of a muscle fiber are called

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In which of the following situations does a resting membrane potential exist?

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Functionally,smooth muscle

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

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After contraction has occurred,the calcium is

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Multiunit smooth muscle is located in the

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

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Which of the following statements concerning smooth muscle is true?

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The elevated oxygen consumption relative to activity level after exercise has ended is called

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Which type of muscle tissue is multinucleated?

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Randy is participating in a strong man competition and is required to pull a yacht as far as he can.Which type of chemical process will his skeletal muscles rely on during this competition?

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Which of the following occurs during recovery from oxygen deficit?

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Epimysium

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When the myosin head flexes into a bend,pulling the actin filament along with it,this is called the

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When repolarization of the cell membrane is complete,the

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Identify the statement concerning skeletal muscle that is true.

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What is tropomyosin?

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The condition of painful,spasmodic contractions of muscles is referred to as

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T tubules

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A stimulus either causes an action potential or it doesn't.This is called

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