Question 1

Cardiac muscle cells are like skeletal muscle cells in that they both

Accepted Answer

A)   have striations.
B)   depolarize as a result of Na+ and Ca2+ influxes.
C)   possess intercalated disks.
D)   lack sarcomeres.
E)   are multinucleated.F) A) and C)
G) B) and C)

Question 2

Which type of muscle tissue has cells that branch?

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

Question 3

The active sites to which cross-bridges attach are found on the

Accepted Answer

A)   sarcoplasmic reticulum.
B)   actin myofilaments.
C)   Z disks.
D)   T tubules.
E)   myosin myofilaments.F) A) and E)
G) None of the above

Question 4

Which of the following situations occurs in electrically excitable cells?

Accepted Answer

A)   When Na+ ion channels open, K+ ion channels close.
B)   The sodium-potassium pump moves sodium into the cell.
C)   Depolarization causes voltage-gated sodium ion channels to open.
D)   Sodium ion channels are opened by high extracellular calcium levels.
E)   The opening and closing of ligand-gated channels cause depolarization.F) A) and B)
G) C) and E)

Question 5

When comparing smooth and skeletal muscle cells, which of the following statements is true?

Accepted Answer

A)   Smooth muscle cells have striations.
B)   The myofilaments in smooth muscle do not form sarcomeres.
C)   Smooth muscle cells are larger than skeletal muscle cells.
D)   Smooth muscle has a lot of actin and myosin.
E)   Smooth muscle cells are multinucleated.F) A) and B)
G) C) and D)

Question 6

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

Accepted Answer

A)   Synaptic vesicles
B)   Synaptic cleft
C)   Sarcolemma
D)   Presynaptic terminal
E)   Postsynaptic membraneF) A) and B)
G) C) and E)

Question 7

Select the phrase that does not belong with the others.

Accepted Answer

A)   Muscle atrophy
B)   Immobilization
C)   Decrease in number of myofibrils
D)   Loss of nerve stimulation
E)   Increased vascularityF) C) and E)
G) A) and E)

Question 8

Maureen is hiking in the cold, and to maintain homeostasis her body begins to

Accepted Answer

A)   increase heat loss from the skin.
B)   release chemicals to initiate a high fever.
C)   shiver.
D)   reduce her blood pressure.
E)   vasodilate vessels in her head and neck.F) A) and B)
G) A) and C)

Question 9

When skeletal muscle is producing CO2 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 respiration and aerobic respiration are correct.D) None of the above
E) All of the above

Question 10

Muscular dystrophy is characterized by

Accepted Answer

A)   chronic muscle pain.
B)   decreased size of muscle fibers.
C)   spastic contractions of muscles.
D)   replacement of muscle tissue by connective tissue.
E)   hypertrophy of muscle tissue.F) A) and D)
G) A) and C)

Question 11

Which type of muscle tissue is multinucleated?

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) A) and E)
G) B) and E)

Question 12

Which of the following is true concerning isotonic eccentric contraction?

Accepted Answer

A)   The muscle shortens, but tension remains constant.
B)   The muscle lengthens, but tension remains constant.
C)   The muscle tenses and shortens.
D)   The muscle tenses, but length remains unchanged.
E)   The muscle lengthens, and tension declines.F) A) and E)
G) A) and D)

Question 13

Arrange these structures as they participate in excitation-contraction.

Accepted Answer

A)   T tubules, sarcolemma, Ca2+, sarcoplasmic reticulum
B)   Ca2+, T tubules, sarcolemma, sarcoplasmic reticulum
C)   Sarcolemma, T tubules, sarcoplasmic reticulum, Ca2+
D)   Sarcoplasmic reticulum, Ca2+, T tubules, sarcolemma
E)   Sarcolemma, sarcoplasmic reticulum, Ca2+, T tubulesF) B) and C)
G) A) and B)

Question 14

Multiple wave summation

Accepted Answer

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

Question 15

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) A) and D)
G) A) and E)

Question 16

Treppe

Accepted Answer

A)   can contribute to improved muscle efficiency.
B)   may be due to an increase in the level of Ca2+ around the myofibril.
C)   is an example of a graded response.
D)   is achieved during warm-up exercises.
E)   All of these choices are correct.F) B) and C)
G) A) and E)

Question 17

A cancer patient is told by their physician that their colon is lacking smooth muscle tone. What does this mean?

Accepted Answer

A)   The colon is developing action potentials too rapidly.
B)   The colon has too many shallow invaginations of plasma membranes.
C)   The colon is unable to maintain constant tension for sustained periods of time.
D)   The intracellular cytoskeleton is overactive.E) A) and D)
F) B) and C)

Question 18

-What does "C" represent on the diagram?

Accepted Answer

A)   Myosin myofilament
B)   Actin myofilament
C)   Sarcomere
D)   Z disk
E)   Cross-bridgeF) All of the above
G) C) and D)

Question 19

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 lactate to glucose
D)   Glycogen degradation to provide creatine
E)   Depressed level of aerobic respirationF) B) and C)
G) B) and D)

Question 20

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) A) and B)
G) B) and E)

Exam 9: Muscular System: Histology and Physiology

Treppe

Correct AnswerverifiedShow Answer

When skeletal muscle is producing CO2 and water while making ATP, which chemical processes could be active at this time?

Correct AnswerverifiedShow Answer

The active sites to which cross-bridges attach are found on the

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following occurs during recovery from oxygen deficit?

Correct AnswerverifiedShow Answer

Select the phrase that does not belong with the others.

Correct AnswerverifiedShow Answer

Which of the following situations occurs in electrically excitable cells?

Correct AnswerverifiedShow Answer

Maureen is hiking in the cold, and to maintain homeostasis her body begins to

Correct AnswerverifiedShow Answer

A cancer patient is told by their physician that their colon is lacking smooth muscle tone. What does this mean?

Correct AnswerverifiedShow Answer

Cardiac muscle cells are like skeletal muscle cells in that they both

Correct AnswerverifiedShow Answer

Muscle hypertrophy results from increased numbers of

Correct AnswerverifiedShow Answer

Arrange these structures as they participate in excitation-contraction.

Correct AnswerverifiedShow Answer

When comparing smooth and skeletal muscle cells, which of the following statements is true?

Correct AnswerverifiedShow Answer

Which type of muscle tissue has cells that branch?

Correct AnswerverifiedShow Answer

Which of the following is true concerning isotonic eccentric contraction?

Correct AnswerverifiedShow Answer

-What does "C" represent on the diagram?

Correct AnswerverifiedShow Answer

Muscular dystrophy is characterized by

Correct AnswerverifiedShow Answer

Which type of muscle tissue is multinucleated?

Correct AnswerverifiedShow Answer

Which of the following statements concerning smooth muscle is true?

Correct AnswerverifiedShow Answer

Multiple wave summation

Correct AnswerverifiedShow Answer

Correct Answer
verified

When skeletal muscle is producing CO₂ and water while making ATP, which chemical processes could be active at this time?

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