Question 1

The immediate source of additional ATP in muscle fibres is ____________________.

Accepted Answer

The answer of The immediate source of additional ATP in...

Question 2

Myosin is considered to be a regulatory protein because it plays an important role in the regulation of muscle contraction.

Accepted Answer

A) True 
 B)False

Question 3

Myosin has ATPase activity.

Accepted Answer

A) True 
 B)False

Question 4

Which of these statements describes why you are able to repeatedly contract and relax your muscles of respiration, allowing you to breathe in and breathe out

Accepted Answer

A) As soon as all the Ca²⁺ stored in the lateral sacs of the sarcoplasmic reticulum is used up, muscle relaxation occurs. 
B) After the muscle cells become excited, acetylcholinesterase maintains the action of acetylcholine. 
C) When there is no longer a local action potential in the muscle cell, Ca²⁺ is actively transported back into the lateral sacs of the sarcoplasmic reticulum. 
D) ATP is not available soon after the contraction. 
A) As soon as all the Ca²⁺ stored in the lateral sacs of the sarcoplasmic reticulum is used up, muscle relaxation occurs. 
B) After the muscle cells become excited, acetylcholinesterase maintains the action of acetylcholine. 
C) When there is no longer a local action potential in the muscle cell, Ca²⁺ is actively transported back into the lateral sacs of the sarcoplasmic reticulum. 
D) ATP is not available soon after the contraction.

Question 5

What causes the striated appearance of skeletal muscle

Accepted Answer

A) regular arrangement of the T tubules running transversely through the muscle fibre 
B) presence of the Z lines extending down the middle of the I bands 
C) presence of gap junctions 
D) regular arrangement of highly organized thick and thin filaments 
A) regular arrangement of the T tubules running transversely through the muscle fibre 
B) presence of the Z lines extending down the middle of the I bands 
C) presence of gap junctions 
D) regular arrangement of highly organized thick and thin filaments

Question 6

Match the types of muscles, labelled a. and b., with the characteristics.
-load exceeds muscle tension

Accepted Answer

A) isometric contraction 
B) isotonic contraction 
A) isometric contraction 
B) isotonic contraction

Question 7

The larger the motor units within a muscle, the more precisely controlled the gradations of contraction.

Accepted Answer

A) True 
 B)False

Question 8

Match the sarcomere components, labelled a. through d., with the characteristics. (Options may be used more than once or not at all.)
-contains partially overlapping thick and thin filaments

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 9

Which of these factors is involved in the gradation of muscle contraction

Accepted Answer

A) greater number of muscle fibres 
B) variation in the frequency of action potentials initiated in each muscle fibre 
C) variation in the size of the action potentials initiated in each muscle fibre 
D) variation in the distance that action potentials can travel 
A) greater number of muscle fibres 
B) variation in the frequency of action potentials initiated in each muscle fibre 
C) variation in the size of the action potentials initiated in each muscle fibre 
D) variation in the distance that action potentials can travel

Question 10

Compare and contrast isotonic versus isometric contractions.

Accepted Answer

The answer of Compare and contrast isotonic versus isometric contractions....

Question 11

Which of the following two molecules participate in cross-bridge interactions

Accepted Answer

A) tropomyosin and myosin 
B) troponin and myosin 
C) troponin and tropomyosin 
D) actin and myosin 
A) tropomyosin and myosin 
B) troponin and myosin 
C) troponin and tropomyosin 
D) actin and myosin

Question 12

Match the sarcomere components, labelled a. through d., with the characteristics. (Options may be used more than once or not at all.)
-joins adjacent sarcomeres together

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 13

Slow-oxidative muscle fibres would be found in high density in the leg muscles of Olympic sprinters.

Accepted Answer

A) True 
 B)False

Question 14

During contraction, asynchronous cycling of cross bridges

Accepted Answer

A) prevents tetany. 
B) prevents thick filaments from slipping backward. 
C) prevents thin filaments from slipping backward. 
D) utilizes less ATP than prior to contraction. 
A) prevents tetany. 
B) prevents thick filaments from slipping backward. 
C) prevents thin filaments from slipping backward. 
D) utilizes less ATP than prior to contraction.

Question 15

Fatigue is the failure of a muscle fibre to maintain which of the following as a result of previous contractile activity

Accepted Answer

A) excitability 
B) muscle mass 
C) tension 
D) sarcomere number 
A) excitability 
B) muscle mass 
C) tension 
D) sarcomere number

Question 16

Match the muscle-tension receptors, labelled a. through c., with the characteristics. (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 receptors 
A) muscle spindle 
B) Golgi tendon organ 
C) both of these receptors

Question 17

Which of these muscle types is striated and contains gap junctions

Accepted Answer

A) single-unit smooth muscle 
B) multiunit smooth muscle 
C) cardiac muscle 
D) skeletal muscle 
A) single-unit smooth muscle 
B) multiunit smooth muscle 
C) cardiac muscle 
D) skeletal muscle

Question 18

During the power stroke, all the cross bridges on myosin do not stroke in unison when pulling the actin filaments.

Accepted Answer

A) True 
 B)False

Question 19

Match the muscle-tension receptors, labelled a. through c., with the characteristics. (Options may be used more than once or not at all.)
-provides information to motor regions of the brain

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 20

Which of these statements does NOT describe cross bridges

Accepted Answer

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

The immediate source of additional ATP in muscle fibres is ____________________.

Myosin is considered to be a regulatory protein because it plays an important role in the regulation of muscle contraction.

Myosin has ATPase activity.

Which of these statements describes why you are able to repeatedly contract and relax your muscles of respiration, allowing you to breathe in and breathe out

What causes the striated appearance of skeletal muscle

Match the types of muscles, labelled a. and b., with the characteristics. -load exceeds muscle tension

The larger the motor units within a muscle, the more precisely controlled the gradations of contraction.

Match the sarcomere components, labelled a. through d., with the characteristics. (Options may be used more than once or not at all.) -contains partially overlapping thick and thin filaments

Which of these factors is involved in the gradation of muscle contraction

Compare and contrast isotonic versus isometric contractions.

Which of the following two molecules participate in cross-bridge interactions

Match the sarcomere components, labelled a. through d., with the characteristics. (Options may be used more than once or not at all.) -joins adjacent sarcomeres together

Slow-oxidative muscle fibres would be found in high density in the leg muscles of Olympic sprinters.

During contraction, asynchronous cycling of cross bridges

Fatigue is the failure of a muscle fibre to maintain which of the following as a result of previous contractile activity

Match the muscle-tension receptors, labelled a. through c., with the characteristics. (Options may be used more than once or not at all.) -initiates a monosynaptic reflex

Which of these muscle types is striated and contains gap junctions

During the power stroke, all the cross bridges on myosin do not stroke in unison when pulling the actin filaments.

Match the muscle-tension receptors, labelled a. through c., with the characteristics. (Options may be used more than once or not at all.) -provides information to motor regions of the brain

Which of these statements does NOT describe cross bridges

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Exam 7: Muscle Physiology

The immediate source of additional ATP in muscle fibres is ____________________.

Myosin is considered to be a regulatory protein because it plays an important role in the regulation of muscle contraction.

Myosin has ATPase activity.

Which of these statements describes why you are able to repeatedly contract and relax your muscles of respiration, allowing you to breathe in and breathe out

What causes the striated appearance of skeletal muscle

Match the types of muscles, labelled a. and b., with the characteristics. -load exceeds muscle tension

The larger the motor units within a muscle, the more precisely controlled the gradations of contraction.

Match the sarcomere components, labelled a. through d., with the characteristics. (Options may be used more than once or not at all.) -contains partially overlapping thick and thin filaments

Which of these factors is involved in the gradation of muscle contraction

Compare and contrast isotonic versus isometric contractions.

Which of the following two molecules participate in cross-bridge interactions

Match the sarcomere components, labelled a. through d., with the characteristics. (Options may be used more than once or not at all.) -joins adjacent sarcomeres together

Slow-oxidative muscle fibres would be found in high density in the leg muscles of Olympic sprinters.

During contraction, asynchronous cycling of cross bridges

Fatigue is the failure of a muscle fibre to maintain which of the following as a result of previous contractile activity

Match the muscle-tension receptors, labelled a. through c., with the characteristics. (Options may be used more than once or not at all.) -initiates a monosynaptic reflex

Which of these muscle types is striated and contains gap junctions

During the power stroke, all the cross bridges on myosin do not stroke in unison when pulling the actin filaments.

Match the muscle-tension receptors, labelled a. through c., with the characteristics. (Options may be used more than once or not at all.) -provides information to motor regions of the brain

Which of these statements does NOT describe cross bridges

The Foundation of Physiology

Cell Physiology

The Central Nervous System

The Peripheral Nervous System: Sensory, Autonomic, Somatic

Principles of Endocrinology: The Central Endocrine Glands

The Endocrine Glands

Cardiac Physiology

Vascular Physiology

The Blood

Body Defences

The Respiratory System

The Urinary System

Fluid and Acidbase Balance

The Digestive System

Energy Balance and Temperature Regulation

The Reproductive System

Filters