Question 1

In an isotonic contraction, only 25 percent of the energy consumed is realized as external work, and the remaining 75 percent is converted to heat.

Accepted Answer

A) True 
 B)False

Question 2

Which of these muscles have motor units with the highest innervation ratio

Accepted Answer

A)  leg muscles
B)  arm muscles
C)  muscles of the trunk
D)  muscles that move the fingersE) A) and B)
F) All of the above

Question 3

Match the skeletal muscle proteins, labelled a. through f., with the descriptions. (Options may be used more than once or not at all.) 
-possess cross bridges

Accepted Answer

A)  actin only
B)  myosin only
C)  actin and myosin
D)  troponin-tropomyosin complex
E)  actin, troponin, and tropomyosinF) actin, myosin, troponin, and tropomyosinG) All of the above
H) A) and B)

Question 4

Which of these methods is NOT a method of gradation of skeletal muscle contraction

Accepted Answer

A)  twitch summation
B)  motor unit recruitment
C)  varying the number of motor units stimulated
D)  stimulating variable portions of each motor unitE) A) and D)
F) None of the above

Question 5

The M line is formed by a flattened disc-like cytoskeletal protein that connects the thin filaments of two adjoining sarcomeres.

Accepted Answer

A) True 
 B)False

Question 6

If you wanted to pick up something heavier than your pencil, you would need to have a stronger muscle contraction.Which of these actions might accomplish this

Accepted Answer

A)  Stimulate more motor units.
B)  Decrease the frequency of stimulation to allow a more prolonged contraction to occur.
C)  Decrease the refractory period.
D)  Block acetylcholinesterase at the neuromuscular junction to allow acetylcholine to function longer.E) A) and D)
F) All of the above

Question 7

If the load on a muscle is increased, eventually a load will be reached, at which the velocity of shortening becomes zero.What is the term for the muscle contraction at this point

Accepted Answer

A)  concentric
B)  eccentric
C)  isotonic
D)  isometricE) C) and D)
F) None of the above

Question 8

Match the types of muscles, labelled a. through g., with the properties in question. (Options may be used more than once or not at all.) 
-found in the walls of hollow organs such as the stomach

Accepted Answer

A)  skeletal muscle only
B)  single-unit smooth muscle only
C)  cardiac muscle only
D)  skeletal muscle and cardiac muscle
E)  skeletal muscle and single-unit smooth muscleF) single-unit smooth muscle and cardiac muscleG) skeletal, single-unit smooth, and cardiac musclesH) A) and E)
I) B) and C)

Question 9

Which of these statements applies to eccentric muscle contractions

Accepted Answer

A)  The development of tension occurs at constant muscle length.
B)  The muscle lengthens while contracting.
C)  The muscle shortens while contracting.
D)  Muscle length and tension will vary throughout a range of motion.E) C) and D)
F) All of the above

Question 10

Which statement is characteristic of most of the body's lever systems

Accepted Answer

A)  They work at mechanical advantage.
B)  They work at a mechanical disadvantage.
C)  Muscles must exert lesser forces than the load.
D)  Muscles must exert greater forces than the load.E) A) and D)
F) None of the above

Question 11

____________________ are the intracellular signal for contraction.

Accepted Answer

The answer of ____________________ are the intracellular signal for contraction....

Question 12

Which of the following is NOT a normal, age-related change that occurs in muscles of older individuals

Accepted Answer

A)  reduction in the number of fibres
B)  reduction in the size of the fibres
C)  large reduction in the blood supply
D)  reduction in adaptation to exerciseE) A) and B)
F) None of the above

Question 13

Rigor mortis occurs when Ca²⁺ links actin and the myosin globular head together in a rigor complex.

Accepted Answer

A) True 
 B)False

Question 14

In order for relaxation to occur, ACh must be removed from the muscle cell's receptors.

Accepted Answer

A) True 
 B)False

Question 15

Which of these characteristics would NOT be exhibited in the muscle cells of a marathon runner's legs

Accepted Answer

A)  high resistance to fatigue
B)  low myoglobin content
C)  low glycogen content
D)  slow speed of contractionE) A) and B)
F) C) and D)

Question 16

The metabolic capability of a muscle fibre can affect the degree of tension it can develop.

Accepted Answer

A) True 
 B)False

Question 17

Rank the following muscle cell components from largest to smallest.
1) troponin
2) myofibril
3) sarcomere
4) thin filament
5) muscle fibre

Accepted Answer

A)  3, 4, 1, 5, 2
B)  1, 2, 3, 5, 4
C)  5, 4, 3, 1, 2
D)  5, 2, 3, 4, 1E) None of the above
F) A) and B)

Question 18

Muscle tension does not develop in isometric contractions.

Accepted Answer

A) True 
 B)False

Question 19

Match the muscle fibre types, labelled a. through c., with the characteristics. (Options may be used more than once or not at all.) 
-hypertrophies in response to weight training

Accepted Answer

A)  slow-oxidative fibre
B)  fast-oxidative fibre
C)  fast-glycolytic fibreD) A) and B)
E) None of the above

Question 20

The contractile response of a muscle fibre to a single action potential is called a(n) ____________________.

Accepted Answer

The answer of The contractile response of a muscle fibre...

Exam 7: Muscle Physiology

Which of the following is NOT a normal, age-related change that occurs in muscles of older individuals

Correct AnswerverifiedShow Answer

Muscle tension does not develop in isometric contractions.

Correct AnswerverifiedShow Answer

If the load on a muscle is increased, eventually a load will be reached, at which the velocity of shortening becomes zero.What is the term for the muscle contraction at this point

Correct AnswerverifiedShow Answer

In order for relaxation to occur, ACh must be removed from the muscle cell's receptors.

Correct AnswerverifiedShow Answer

Which of these statements applies to eccentric muscle contractions

Correct AnswerverifiedShow Answer

Match the muscle fibre types, labelled a. through c., with the characteristics. (Options may be used more than once or not at all.) -hypertrophies in response to weight training

Correct AnswerverifiedShow Answer

Which of these characteristics would NOT be exhibited in the muscle cells of a marathon runner's legs

Correct AnswerverifiedShow Answer

____________________ are the intracellular signal for contraction.

Correct AnswerverifiedShow Answer

The M line is formed by a flattened disc-like cytoskeletal protein that connects the thin filaments of two adjoining sarcomeres.

Correct AnswerverifiedShow Answer

Match the types of muscles, labelled a. through g., with the properties in question. (Options may be used more than once or not at all.) -found in the walls of hollow organs such as the stomach

Correct AnswerverifiedShow Answer

The contractile response of a muscle fibre to a single action potential is called a(n) ____________________.

Correct AnswerverifiedShow Answer

Match the skeletal muscle proteins, labelled a. through f., with the descriptions. (Options may be used more than once or not at all.) -possess cross bridges

Correct AnswerverifiedShow Answer

Rank the following muscle cell components from largest to smallest. 1) troponin 2) myofibril 3) sarcomere 4) thin filament 5) muscle fibre

Correct AnswerverifiedShow Answer

Which statement is characteristic of most of the body's lever systems

Correct AnswerverifiedShow Answer

Which of these muscles have motor units with the highest innervation ratio

Correct AnswerverifiedShow Answer

Which of these methods is NOT a method of gradation of skeletal muscle contraction

Correct AnswerverifiedShow Answer

If you wanted to pick up something heavier than your pencil, you would need to have a stronger muscle contraction.Which of these actions might accomplish this

Correct AnswerverifiedShow Answer

Rigor mortis occurs when Ca²⁺ links actin and the myosin globular head together in a rigor complex.

Correct AnswerverifiedShow Answer

In an isotonic contraction, only 25 percent of the energy consumed is realized as external work, and the remaining 75 percent is converted to heat.

Correct AnswerverifiedShow Answer

The metabolic capability of a muscle fibre can affect the degree of tension it can develop.

Correct AnswerverifiedShow Answer

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