Question 1

Which statement concerning cross bridges is INCORRECT?

Accepted Answer

A)  Cross bridges are the globular heads of myosin molecules. 
B)  Cross bridges have actin binding sites that are normally covered by troponin and tropomyosin except during excitation-contraction coupling. 
C)  Cross bridges bind with actin and then bend to pull the thin filaments inward during contraction according to the sliding filament mechanism. 
D)  Mg2+ is necessary to bind ATP to the cross bridge. 
A)  Cross bridges are the globular heads of myosin molecules. 
B)  Cross bridges have actin binding sites that are normally covered by troponin and tropomyosin except during excitation-contraction coupling. 
C)  Cross bridges bind with actin and then bend to pull the thin filaments inward during contraction according to the sliding filament mechanism. 
D)  Mg2+ is necessary to bind ATP to the cross bridge.

Question 2

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).
-can exist over a variety of lengths with little change in tension

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 muscle
F)single-unit smooth muscle and cardiac muscle
G)skeletal, single-unit smooth, and cardiac muscles 
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 muscle
F)single-unit smooth muscle and cardiac muscle
G)skeletal, single-unit smooth, and cardiac muscles

Question 3

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all).
-can be transformed into another fibre type by specific training

Accepted Answer

A) slow-oxidative fibre 
B) fast-oxidative fibre 
C) fast-glycolytic fibre 
A) slow-oxidative fibre 
B) fast-oxidative fibre 
C) fast-glycolytic fibre

Question 4

The ____________________ is the descending motor pathway that mediates performance of fine,discrete voluntary movements of the hands.

Accepted Answer

corticospi

Question 5

The shorter a muscle fibre is before the onset of a contraction,the greater the force that can be developed upon the subsequent contraction because the thin filaments are already partially slid inward.

Accepted Answer

A) True 
 B)False

Question 6

What does a functional syncytium of cardiac muscles cells mean?

Accepted Answer

A)  They are striated. 
B)  They exhibit muscle tone. 
C)  They have a short refractory period. 
D)  They work as a unit mechanically and electrically. 
A)  They are striated. 
B)  They exhibit muscle tone. 
C)  They have a short refractory period. 
D)  They work as a unit mechanically and electrically.

Question 7

Which statement concerning cross bridges is INCORRECT?

Accepted Answer

A)  Cross bridges bind to actin during muscle contraction. 
B)  Cross bridges are formed by the globular heads of the myosin molecules. 
C)  Cross bridges consist of troponin and tropomyosin protruding from the actin helix. 
D)  Cross bridges bend during muscle contraction. 
A)  Cross bridges bind to actin during muscle contraction. 
B)  Cross bridges are formed by the globular heads of the myosin molecules. 
C)  Cross bridges consist of troponin and tropomyosin protruding from the actin helix. 
D)  Cross bridges bend during muscle contraction.

Question 8

____________________ refers to paralysis of the legs resulting from lower spinal cord injury.

Accepted Answer

The answer of ____________________ refers to paralysis of the legs...

Question 9

The gradation of whole-muscle tension depends on the number of ____________________ that contract.

Accepted Answer

muscle fib

Question 10

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

Accepted Answer

A) muscle spindle 
B) Golgi tendon organ 
C) both of these receptors 
A) muscle spindle 
B) Golgi tendon organ 
C) both of these receptors

Question 11

Muscle relaxation does not take place until all of the ATP is used up.

Accepted Answer

A) True 
 B)False

Question 12

What happens when a muscle atrophies?

Accepted Answer

A)  The muscle fibres split lengthwise. 
B)  The muscle decreases in mass and becomes weaker. 
C)  The muscle fibres increase in diameter. 
D)  The muscle fibres undergo mitotic cell division. 
A)  The muscle fibres split lengthwise. 
B)  The muscle decreases in mass and becomes weaker. 
C)  The muscle fibres increase in diameter. 
D)  The muscle fibres undergo mitotic cell division.

Question 13

Which of the following is NOT a determinant of whole muscle tension?

Accepted Answer

A)  the number of muscle fibres contracting 
B)  the tension produced by each contracting fibre 
C)  the extent of motor-unit recruitment 
D)  the proportion of each motor unit that is contracting at any given time 
A)  the number of muscle fibres contracting 
B)  the tension produced by each contracting fibre 
C)  the extent of motor-unit recruitment 
D)  the proportion of each motor unit that is contracting at any given time

Question 14

ATP expenditure is required for both contraction and relaxation of a muscle fibre.

Accepted Answer

A) True 
 B)False

Question 15

Why are stretch reflexes important?

Accepted Answer

A)  for maintaining balance and posture 
B)  for providing afferent information coordinating complex muscle activity 
C)  for determining the level of tone 
D)  for prevention of muscle injury 
A)  for maintaining balance and posture 
B)  for providing afferent information coordinating complex muscle activity 
C)  for determining the level of tone 
D)  for prevention of muscle injury

Question 16

The contraction phase of a muscle cell lasts longer than the relaxation phase.

Accepted Answer

A) True 
 B)False

Question 17

Match the sarcomere component with the correct characteristic by using the answer code (options may be used more than once or not at all).
-runs down the middle of the I band

Accepted Answer

A) Z line 
B) A band 
C) I band 
D) H zone 
A) Z line 
B) A band 
C) I band 
D) H zone

Question 18

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).
-behaves as a functional syncytium

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 muscle
F)single-unit smooth muscle and cardiac muscle
G)skeletal, single-unit smooth, and cardiac muscles 
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 muscle
F)single-unit smooth muscle and cardiac muscle
G)skeletal, single-unit smooth, and cardiac muscles

Question 19

What are the means by which skeletal muscle fibres utilize energy for contraction?

Accepted Answer

The answer of What are the means by which skeletal...

Question 20

The H zone of the sarcomere consists of myosin but does not contain actin.

Accepted Answer

A) True 
 B)False

Which statement concerning cross bridges is INCORRECT?

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). -can exist over a variety of lengths with little change in tension

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all). -can be transformed into another fibre type by specific training

The ____________________ is the descending motor pathway that mediates performance of fine,discrete voluntary movements of the hands.

The shorter a muscle fibre is before the onset of a contraction,the greater the force that can be developed upon the subsequent contraction because the thin filaments are already partially slid inward.

What does a functional syncytium of cardiac muscles cells mean?

Which statement concerning cross bridges is INCORRECT?

____________________ refers to paralysis of the legs resulting from lower spinal cord injury.

The gradation of whole-muscle tension depends on the number of ____________________ that contract.

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

Muscle relaxation does not take place until all of the ATP is used up.

What happens when a muscle atrophies?

Which of the following is NOT a determinant of whole muscle tension?

ATP expenditure is required for both contraction and relaxation of a muscle fibre.

Why are stretch reflexes important?

The contraction phase of a muscle cell lasts longer than the relaxation phase.

Match the sarcomere component with the correct characteristic by using the answer code (options may be used more than once or not at all). -runs down the middle of the I band

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). -behaves as a functional syncytium

What are the means by which skeletal muscle fibres utilize energy for contraction?

The H zone of the sarcomere consists of myosin but does not contain actin.

The Foundation of Physiology

Cell Physiology

The Central Nervous System

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Exam 6: Muscle Physiology

Which statement concerning cross bridges is INCORRECT?

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). -can exist over a variety of lengths with little change in tension

Indicate which of the characteristics in question applies to each of the muscle fibre types by using the answer code (options may be used more than once or not at all). -can be transformed into another fibre type by specific training

The ____________________ is the descending motor pathway that mediates performance of fine,discrete voluntary movements of the hands.

The shorter a muscle fibre is before the onset of a contraction,the greater the force that can be developed upon the subsequent contraction because the thin filaments are already partially slid inward.

What does a functional syncytium of cardiac muscles cells mean?

Which statement concerning cross bridges is INCORRECT?

____________________ refers to paralysis of the legs resulting from lower spinal cord injury.

The gradation of whole-muscle tension depends on the number of ____________________ that contract.

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

Muscle relaxation does not take place until all of the ATP is used up.

What happens when a muscle atrophies?

Which of the following is NOT a determinant of whole muscle tension?

ATP expenditure is required for both contraction and relaxation of a muscle fibre.

Why are stretch reflexes important?

The contraction phase of a muscle cell lasts longer than the relaxation phase.

Match the sarcomere component with the correct characteristic by using the answer code (options may be used more than once or not at all). -runs down the middle of the I band

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). -behaves as a functional syncytium

What are the means by which skeletal muscle fibres utilize energy for contraction?

The H zone of the sarcomere consists of myosin but does not contain actin.

The Foundation of Physiology

Cell Physiology

The Central Nervous System

The Peripheral Nervous System

Principals of Endocrinology; The Central Endocrine Glands

Cardiac Physiology

Vascular Physiology

The Blood

Body Defences

The Respiratory System

The Urinary System

Fluid and Acid Base Balance

The Digestive System

Energy Balance and Temperature Regulation

The Endocrine Glands

The Reproductive System

Filters