Question 1

Which of the following binds with calcium that enters the cell during smooth muscle excitation?

Accepted Answer

A)   calmodulin
B)   inactive myosin kinase
C)   troponin
D)   myosinE) A) and D)
F) B) and C)

Question 2

MATCHING
Indicate which of the muscle proteins in skeletal muscle is associated with the item in question by using the following code (options may be used more than once or not at all) .
-regulatory protein(s)

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) E) and F)
H) A) and B)

Question 3

Indicate the characteristics of the muscle-tension receptors by using the answer code (options may be used more than once or not at all) .
-activated by muscle stretch

Accepted Answer

A)  muscle spindle
B)  Golgi tendon organ
C)  both of these receptorsD) None of the above
E) All of the above

Question 4

Why must the oxygen debt be "paid off" following rigorous muscular activity?

Accepted Answer

A)   Creatine phosphate must be regenerated.
B)   Lactic acid must be repleted.
C)   Glycogen stores must be depleted.
D)   Creatine phosphate must be depleted.E) C) and D)
F) B) and C)

Question 5

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

Accepted Answer

A)   concentric
B)   eccentric
C)   isotonic
D)   isometricE) A) and D)
F) A) and C)

Question 6

Which of the following is correct for multiunit smooth muscle?

Accepted Answer

A)   It is chemically activated.
B)   It is under ANS control.
C)   It is found in the walls of the digestive system.
D)   Most smooth muscle is multiunit smooth muscle.E) C) and D)
F) B) and D)

Question 7

The work performed by a muscle is the force it develops divided by distance.

Accepted Answer

A) True 
 B)False

Question 8

Indicate which type of muscle is associated with the property in question by using the answer code (options may be used more than once or not at all) .
-found in the heart

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 G)
I) B) and D)

Question 9

The functional unit of skeletal muscle is a(n)____________________.

Accepted Answer

The answer of The functional unit of skeletal muscle is...

Question 10

In a state of ____________________,a muscle cannot maintain any kind of tension.

Accepted Answer

The answer of In a state of ____________________,a muscle cannot...

Question 11

Anaerobic exercise is endurance-type exercise.

Accepted Answer

A) True 
 B)False

Question 12

Which statement concerning myosin is correct?

Accepted Answer

A)   It is found in the A band.
B)   It is found in the I band.
C)   It is the primary protein found in the thin filaments.
D)   It contracts during muscle contraction because it is one of the contractile proteins.E) None of the above
F) A) and B)

Question 13

Indicate which type of muscle is associated with the property in question by using the answer code (options may be used more than once or not at all) .
-innervated by motor neurons

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 F)
I) A) and G)

Question 14

In smooth muscle,Ca²⁺ binds with the protein ____________________,which is structurally similar to troponin.

Accepted Answer

The answer of In smooth muscle,Ca²⁺ binds with the protein...

Question 15

Which statement is true regarding the sliding-filament mechanism of muscle contraction?

Accepted Answer

A)   A bands slide in closer between the I bands
B)   thin filaments slide inward toward the centre of the A band
C)   Z lines slide in between the T tubules
D)   contractile proteins contract, thus shortening the sarcomereE) None of the above
F) All of the above

Question 16

Indicate the characteristics of the muscle-tension receptors by using the answer code (options may be used more than once or not at all) .
-initiates a monosynaptic reflex

Accepted Answer

A)  muscle spindle
B)  Golgi tendon organ
C)  both of these receptorsD) A) and B)
E) A) and C)

Question 17

Acetylcholinesterase removes ACh from receptors.

Accepted Answer

A) True 
 B)False

Question 18

According to the sliding filament mechanism of muscle contraction,the muscle fibres of one motor unit slide in closer together between the muscle fibres of adjacent motor units.

Accepted Answer

A) True 
 B)False

Question 19

Which chemical is required for contraction of smooth muscle fibres?

Accepted Answer

A)   sodium
B)   calmodulin
C)   potassium
D)   myosinE) A) and D)
F) None of the above

Question 20

The lever system at the elbow joint provides a mechanical advantage so that when the biceps muscle contracts to flex the elbow joint and lift an object in the hand,the force developed in the biceps can be considerably less than the actual load that is moved.

Accepted Answer

A) True 
 B)False

Exam 6: Muscle Physiology

Indicate which type of muscle is associated with the property in question by using the answer code (options may be used more than once or not at all) . -found in the heart

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.At this point,what is the term for the muscle contraction?

Correct AnswerverifiedShow Answer

Which statement is true regarding the sliding-filament mechanism of muscle contraction?

Correct AnswerverifiedShow Answer

Which statement concerning myosin is correct?

Correct AnswerverifiedShow Answer

In smooth muscle,Ca²⁺ binds with the protein ____________________,which is structurally similar to troponin.

Correct AnswerverifiedShow Answer

The work performed by a muscle is the force it develops divided by distance.

Correct AnswerverifiedShow Answer

Indicate the characteristics of the muscle-tension receptors by using the answer code (options may be used more than once or not at all) . -activated by muscle stretch

Correct AnswerverifiedShow Answer

Which of the following is correct for multiunit smooth muscle?

Correct AnswerverifiedShow Answer

Acetylcholinesterase removes ACh from receptors.

Correct AnswerverifiedShow Answer

According to the sliding filament mechanism of muscle contraction,the muscle fibres of one motor unit slide in closer together between the muscle fibres of adjacent motor units.

Correct AnswerverifiedShow Answer

Indicate the characteristics of the muscle-tension receptors by using the answer code (options may be used more than once or not at all) . -initiates a monosynaptic reflex

Correct AnswerverifiedShow Answer

MATCHING Indicate which of the muscle proteins in skeletal muscle is associated with the item in question by using the following code (options may be used more than once or not at all) . -regulatory protein(s)

Correct AnswerverifiedShow Answer

Anaerobic exercise is endurance-type exercise.

Correct AnswerverifiedShow Answer

Indicate which type of muscle is associated with the property in question by using the answer code (options may be used more than once or not at all) . -innervated by motor neurons

Correct AnswerverifiedShow Answer

The functional unit of skeletal muscle is a(n)____________________.

Correct AnswerverifiedShow Answer

Which of the following binds with calcium that enters the cell during smooth muscle excitation?

Correct AnswerverifiedShow Answer

Why must the oxygen debt be "paid off" following rigorous muscular activity?

Correct AnswerverifiedShow Answer

The lever system at the elbow joint provides a mechanical advantage so that when the biceps muscle contracts to flex the elbow joint and lift an object in the hand,the force developed in the biceps can be considerably less than the actual load that is moved.

Correct AnswerverifiedShow Answer

Which chemical is required for contraction of smooth muscle fibres?

Correct AnswerverifiedShow Answer

In a state of ____________________,a muscle cannot maintain any kind of tension.

Correct AnswerverifiedShow Answer

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