Question 1

Which of these events is NOT involved in the relaxation of muscle

Accepted Answer

A) Acetylcholine is destroyed by acetylcholinesterase. 
B) There is no longer a local action potential. 
C) The T tubules actively take up the Ca²⁺ that was released. 
D) The actin and myosin molecules become unbound. 
A) Acetylcholine is destroyed by acetylcholinesterase. 
B) There is no longer a local action potential. 
C) The T tubules actively take up the Ca²⁺ that was released. 
D) The actin and myosin molecules become unbound.

Question 2

Which of these statements describes the summation of simple twitches

Accepted Answer

A) They can occur from the long duration of the action potential in a muscle fibre. 
B) They reduce the tension in a muscle. 
C) They result from the slow stimulation of a muscle fibre. 
D) If they are from action potentials, they add together. 
A) They can occur from the long duration of the action potential in a muscle fibre. 
B) They reduce the tension in a muscle. 
C) They result from the slow stimulation of a muscle fibre. 
D) If they are from action potentials, they add together.

Question 3

Which of these statements describes actin

Accepted Answer

A) It is spherical. 
B) It contains a globular head that forms the cross bridges between the thick and thin filaments. 
C) It is referred to as a regulatory protein. 
D) It is inhibited by Ca²⁺. 
A) It is spherical. 
B) It contains a globular head that forms the cross bridges between the thick and thin filaments. 
C) It is referred to as a regulatory protein. 
D) It is inhibited by Ca²⁺.

Question 4

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.)
-contraction triggered as Ca²⁺ physically pulls troponin and tropomyosin from its blocking position over actin's binding sites for the cross bridges

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 5

Thick filaments are made up of the protein ____________________, whereas thin filaments are composed of the three proteins ____________________, ____________________, and ____________________.

Accepted Answer

myosin
actin; tropom

Question 6

Match the types of muscles, labelled a. and b., with the characteristics.
-length remains constant

Accepted Answer

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

Question 7

Which of these statements does NOT describe cross bridges

Accepted Answer

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

Question 8

A(n) ____________________ develops following sustained anaerobic activity of muscles.

Accepted Answer

The answer of A(n) ____________________ develops following sustained anaerobic activity...

Question 9

Match the muscle fibre types, labelled a. through c., with the characteristics. (Options may be used more than once or not at all.)
-has numerous mitochondria

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 10

Anaerobic exercise is endurance-type exercise.

Accepted Answer

A) True 
 B)False

Question 11

Match the muscle-tension receptors, labelled a. through c., with the characteristics. (Options may be used more than once or not at all.)
-unless compensatory measures are taken, this receptor becomes slack

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 12

Which of these types of muscle cells are NOT capable of spontaneous depolarization

Accepted Answer

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

Question 13

The ____________________ is the extensor muscle found in the thigh that contracts during the patellar tendon reflex.

Accepted Answer

The answer of The ____________________ is the extensor muscle found...

Question 14

Central fatigue of a muscle results directly from the accumulation of lactic acid in the muscle.

Accepted Answer

A) True 
 B)False

Question 15

The functional unit of skeletal muscle is the myofibril.

Accepted Answer

A) True 
 B)False

Question 16

Match the skeletal muscle proteins, labelled a. through f., with the descriptions. (Options may be used more than once or not at all.)
-has (have) ATPase capacity

Accepted Answer

A) actin only 
B) myosin only 
C) actin and myosin 
D) troponin-tropomyosin complex 
E) actin, troponin, and tropomyosin
F)actin, myosin, troponin, and tropomyosin 
A) actin only 
B) myosin only 
C) actin and myosin 
D) troponin-tropomyosin complex 
E) actin, troponin, and tropomyosin
F)actin, myosin, troponin, and tropomyosin

Question 17

Tropomyosin covers the cross-bridge binding sites on the thick filaments when a sarcomere is not contracting.

Accepted Answer

A) True 
 B)False

Question 18

Slow-oxidative fibres are type ____________________ fibres in the muscle.

Accepted Answer

The answer of Slow-oxidative fibres are type ____________________ fibres in...

Question 19

Twitch summation is similar to the ____________________ summation of EPSPs.

Accepted Answer

The answer of Twitch summation is similar to the ____________________...

Question 20

Which of these statements describes myosin

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. 
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.

Which of these events is NOT involved in the relaxation of muscle

Which of these statements describes the summation of simple twitches

Which of these statements describes actin

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.) -contraction triggered as Ca²⁺ physically pulls troponin and tropomyosin from its blocking position over actin's binding sites for the cross bridges

Thick filaments are made up of the protein , whereas thin filaments are composed of the three proteins , , and .

Match the types of muscles, labelled a. and b., with the characteristics. -length remains constant

Which of these statements does NOT describe cross bridges

A(n) ____________________ develops following sustained anaerobic activity of muscles.

Match the muscle fibre types, labelled a. through c., with the characteristics. (Options may be used more than once or not at all.) -has numerous mitochondria

Anaerobic exercise is endurance-type exercise.

Match the muscle-tension receptors, labelled a. through c., with the characteristics. (Options may be used more than once or not at all.) -unless compensatory measures are taken, this receptor becomes slack

Which of these types of muscle cells are NOT capable of spontaneous depolarization

The ____________________ is the extensor muscle found in the thigh that contracts during the patellar tendon reflex.

Central fatigue of a muscle results directly from the accumulation of lactic acid in the muscle.

The functional unit of skeletal muscle is the myofibril.

Match the skeletal muscle proteins, labelled a. through f., with the descriptions. (Options may be used more than once or not at all.) -has (have) ATPase capacity

Tropomyosin covers the cross-bridge binding sites on the thick filaments when a sarcomere is not contracting.

Slow-oxidative fibres are type ____________________ fibres in the muscle.

Twitch summation is similar to the ____________________ summation of EPSPs.

Which of these statements describes myosin

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Exam 7: Muscle Physiology

Which of these events is NOT involved in the relaxation of muscle

Which of these statements describes the summation of simple twitches

Which of these statements describes actin

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.) -contraction triggered as Ca²⁺ physically pulls troponin and tropomyosin from its blocking position over actin's binding sites for the cross bridges

Thick filaments are made up of the protein ____________________, whereas thin filaments are composed of the three proteins ____________________, ____________________, and ____________________.

Match the types of muscles, labelled a. and b., with the characteristics. -length remains constant

Which of these statements does NOT describe cross bridges

A(n) ____________________ develops following sustained anaerobic activity of muscles.

Match the muscle fibre types, labelled a. through c., with the characteristics. (Options may be used more than once or not at all.) -has numerous mitochondria

Anaerobic exercise is endurance-type exercise.

Match the muscle-tension receptors, labelled a. through c., with the characteristics. (Options may be used more than once or not at all.) -unless compensatory measures are taken, this receptor becomes slack

Which of these types of muscle cells are NOT capable of spontaneous depolarization

The ____________________ is the extensor muscle found in the thigh that contracts during the patellar tendon reflex.

Central fatigue of a muscle results directly from the accumulation of lactic acid in the muscle.

The functional unit of skeletal muscle is the myofibril.

Match the skeletal muscle proteins, labelled a. through f., with the descriptions. (Options may be used more than once or not at all.) -has (have) ATPase capacity

Tropomyosin covers the cross-bridge binding sites on the thick filaments when a sarcomere is not contracting.

Slow-oxidative fibres are type ____________________ fibres in the muscle.

Twitch summation is similar to the ____________________ summation of EPSPs.

Which of these statements describes myosin

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

Thick filaments are made up of the protein , whereas thin filaments are composed of the three proteins , , and .