Question 1

Skeletal muscles are stimulated to contract by release of the neurotransmitter ____________________.

Accepted Answer

The answer of Skeletal muscles are stimulated to contract by...

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).
-contraction is 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 3

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

Accepted Answer

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

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

Which of the following events happens during excitation-contraction coupling?

Accepted Answer

A)  The action potential travels down the thin myofilaments 
B)  Ca2+ is released from the sarcoplasmic reticulum. 
C)  Ca2+ is taken up by the sarcoplasmic reticulum. 
D)  Calcium blocks the binding sites on the actin molecules. 
A)  The action potential travels down the thin myofilaments 
B)  Ca2+ is released from the sarcoplasmic reticulum. 
C)  Ca2+ is taken up by the sarcoplasmic reticulum. 
D)  Calcium blocks the binding sites on the actin molecules.

Question 6

What happens during muscle contraction?

Accepted Answer

A)  The contractile proteins contract. 
B)  The A band becomes shorter. 
C)  The H zone becomes smaller or disappears. 
D)  The I band remains unchanged. 
A)  The contractile proteins contract. 
B)  The A band becomes shorter. 
C)  The H zone becomes smaller or disappears. 
D)  The I band remains unchanged.

Question 7

What is NOT characteristic of smooth muscle?

Accepted Answer

A)  It is under involuntary control. 
B)  It does not have troponin. 
C)  Its contraction is initiated neurogenically. 
D)  It is found in the walls of hollow tube-like organs. 
A)  It is under involuntary control. 
B)  It does not have troponin. 
C)  Its contraction is initiated neurogenically. 
D)  It is found in the walls of hollow tube-like organs.

Question 8

Which molecules are involved with regulation of cross-bridge attachment activity?

Accepted Answer

A)  calcium ions and troponin 
B)  troponin and titin 
C)  tropomyosin and calmodulin 
D)  titin only 
A)  calcium ions and troponin 
B)  troponin and titin 
C)  tropomyosin and calmodulin 
D)  titin only

Question 9

What composes thick filaments in skeletal muscle?

Accepted Answer

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

Question 10

Slow-oxidative muscle fibres have high resistance to fatigue.

Accepted Answer

A) True 
 B)False

Question 11

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

Accepted Answer

A) True 
 B)False

Question 12

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).
-displays pacemaker potentials and slow-wave potentials

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 13

Which statement concerning the corticospinal system is correct?

Accepted Answer

A)  It consists of fibres that originate within the primary motor cortex and terminate on motor neurons. 
B)  It involves the motor regions of the cortex, the cerebellum, the basal nuclei, and the thalamus. 
C)  It is primarily concerned with regulation of overall body posture. 
D)  It consists of fibres that originate within the parietal lobe and terminate on posterior grey horn of the spinal cord. 
A)  It consists of fibres that originate within the primary motor cortex and terminate on motor neurons. 
B)  It involves the motor regions of the cortex, the cerebellum, the basal nuclei, and the thalamus. 
C)  It is primarily concerned with regulation of overall body posture. 
D)  It consists of fibres that originate within the parietal lobe and terminate on posterior grey horn of the spinal cord.

Question 14

What happens when an action potential reaches the presynaptic terminal of the motor neuron?

Accepted Answer

A)  Calcium is released inside the muscle fibre. 
B)  Acetylcholine is released into the synaptic cleft. 
C)  Acetylcholinesterase is released into the synaptic cleft. 
D)  Physical contact between the motor neuron and the muscle fibre occurs. 
A)  Calcium is released inside the muscle fibre. 
B)  Acetylcholine is released into the synaptic cleft. 
C)  Acetylcholinesterase is released into the synaptic cleft. 
D)  Physical contact between the motor neuron and the muscle fibre occurs.

Question 15

Both multiunit and single-unit smooth muscle are under motor control from the autonomic nervous system.

Accepted Answer

A) True 
 B)False

Question 16

Which statement concerning myoglobin is correct?

Accepted Answer

A)  It can store small amounts of CO2. 
B)  It increases the rate of O2 transfer from the blood into muscle fibres. 
C)  It is abundant in fast-glycolytic fibres. 
D)  It is abundant in slow red fibres. 
A)  It can store small amounts of CO2. 
B)  It increases the rate of O2 transfer from the blood into muscle fibres. 
C)  It is abundant in fast-glycolytic fibres. 
D)  It is abundant in slow red fibres.

Question 17

Which characteristics are shared by all three types of muscle tissues?

Accepted Answer

A)  All contain myosin and actin. 
B)  All are neurogenic. 
C)  All are striated. 
D)  All are considered to be under voluntary control. 
A)  All contain myosin and actin. 
B)  All are neurogenic. 
C)  All are striated. 
D)  All are considered to be under voluntary control.

Question 18

During muscle contraction,the A band becomes shorter.

Accepted Answer

A) True 
 B)False

Question 19

What can activate the stretch receptors in the central portion of the muscle spindle?

Accepted Answer

A)  passive stretch of the skin overlying the muscle 
B)  contraction of the central portions of the muscle fibre 
C)  gamma motor neuron stimulation of the muscle spindle 
D)  alpha motor neuron 
A)  passive stretch of the skin overlying the muscle 
B)  contraction of the central portions of the muscle fibre 
C)  gamma motor neuron stimulation of the muscle spindle 
D)  alpha motor neuron

Question 20

Which statement concerning myosin is correct?

Accepted Answer

A)  It is spherical in shape. 
B)  It is the main structural component of the thin filaments. 
C)  It is referred to as a contractile protein. 
D)  It consists of four identical protein subunits. 
A)  It is spherical in shape. 
B)  It is the main structural component of the thin filaments. 
C)  It is referred to as a contractile protein. 
D)  It consists of four identical protein subunits.

Skeletal muscles are stimulated to contract by release of the neurotransmitter ____________________.

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

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

Which of the following events happens during excitation-contraction coupling?

What happens during muscle contraction?

What is NOT characteristic of smooth muscle?

Which molecules are involved with regulation of cross-bridge attachment activity?

What composes thick filaments in skeletal muscle?

Slow-oxidative muscle fibres have high resistance to fatigue.

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

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). -displays pacemaker potentials and slow-wave potentials

Which statement concerning the corticospinal system is correct?

What happens when an action potential reaches the presynaptic terminal of the motor neuron?

Both multiunit and single-unit smooth muscle are under motor control from the autonomic nervous system.

Which statement concerning myoglobin is correct?

Which characteristics are shared by all three types of muscle tissues?

During muscle contraction,the A band becomes shorter.

What can activate the stretch receptors in the central portion of the muscle spindle?

Which statement concerning myosin is correct?

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

Exam 6: Muscle Physiology

Skeletal muscles are stimulated to contract by release of the neurotransmitter ____________________.

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

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

Which of the following events happens during excitation-contraction coupling?

What happens during muscle contraction?

What is NOT characteristic of smooth muscle?

Which molecules are involved with regulation of cross-bridge attachment activity?

What composes thick filaments in skeletal muscle?

Slow-oxidative muscle fibres have high resistance to fatigue.

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

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). -displays pacemaker potentials and slow-wave potentials

Which statement concerning the corticospinal system is correct?

What happens when an action potential reaches the presynaptic terminal of the motor neuron?

Both multiunit and single-unit smooth muscle are under motor control from the autonomic nervous system.

Which statement concerning myoglobin is correct?

Which characteristics are shared by all three types of muscle tissues?

During muscle contraction,the A band becomes shorter.

What can activate the stretch receptors in the central portion of the muscle spindle?

Which statement concerning myosin is correct?

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