Question 1

The force of muscle contraction is most related to the

Accepted Answer

A) amount of calcium that is stored within the sarcoplasmic reticulum. 
B) amount of neurotransmitter released from the prejunctional vesicles. 
C) numbers of cross-bridges formed between actin and myosin. 
D) size of the somatic motor neuron. 
A) amount of calcium that is stored within the sarcoplasmic reticulum. 
B) amount of neurotransmitter released from the prejunctional vesicles. 
C) numbers of cross-bridges formed between actin and myosin. 
D) size of the somatic motor neuron.

Question 2

Which group of muscles is located on the posterior thigh?

Accepted Answer

A) Rotator cuff muscles 
B) Quadriceps femoris 
C) Hamstrings 
D) Muscles of mastication 
A) Rotator cuff muscles 
B) Quadriceps femoris 
C) Hamstrings 
D) Muscles of mastication

Question 3

Joey has had his leg in a non-weight-bearing cast for 8 weeks.When the cast is removed,the diameter of the leg appears smaller than the uninjured leg.Which term best describes this observation?

Accepted Answer

A) Contracture 
B) Hypertrophy 
C) Muscle dystrophy 
D) Disuse atrophy 
A) Contracture 
B) Hypertrophy 
C) Muscle dystrophy 
D) Disuse atrophy

Question 4

Which of the following best describes a sphincter muscle?

Accepted Answer

A) Oblique 
B) Encircle 
C) Straight 
D) Aponeurosis 
A) Oblique 
B) Encircle 
C) Straight 
D) Aponeurosis

Question 5

Recruitment increases the

Accepted Answer

A) force of muscle contraction. 
B) amount of cholinesterase in the neuromuscular junction. 
C) number of motor units that are activated. 
D) Two of the above are true. 
A) force of muscle contraction. 
B) amount of cholinesterase in the neuromuscular junction. 
C) number of motor units that are activated. 
D) Two of the above are true.

Question 6

With regard to skeletal muscle contraction,which event comes last?

Accepted Answer

A) Shortening of the sarcomere 
B) Release of calcium from the sarcoplasmic reticulum 
C) Activation of the NM receptors by ACh 
D) Release of neurotransmitter (ACh) from the somatic motor neuron 
A) Shortening of the sarcomere 
B) Release of calcium from the sarcoplasmic reticulum 
C) Activation of the NM receptors by ACh 
D) Release of neurotransmitter (ACh) from the somatic motor neuron

Question 7

The rectus,transversus,internal oblique,and external oblique refer to

Accepted Answer

A) smooth muscles. 
B) abdominal muscles. 
C) breathing muscles. 
D) muscles that are located on the back and work synergistically with the latissimus dorsi. 
A) smooth muscles. 
B) abdominal muscles. 
C) breathing muscles. 
D) muscles that are located on the back and work synergistically with the latissimus dorsi.

Question 8

As the electrical signal travels through the T tubules,it causes the

Accepted Answer

A) release of calcium from the sarcoplasmic reticulum. 
B) release of the neurotransmitter ACh from the axon terminal in the neuromuscular junction. 
C) inactivation of the ACh within the neuromuscular junction. 
D) myosin heads to detach from the actin. 
A) release of calcium from the sarcoplasmic reticulum. 
B) release of the neurotransmitter ACh from the axon terminal in the neuromuscular junction. 
C) inactivation of the ACh within the neuromuscular junction. 
D) myosin heads to detach from the actin.

Question 9

The supinator and pronator muscles

Accepted Answer

A) have their origin on the sternum and clavicle. 
B) act synergistically with the sternocleidomastoid muscles. 
C) are located in the lower extremities. 
D) change the position of the hand. 
A) have their origin on the sternum and clavicle. 
B) act synergistically with the sternocleidomastoid muscles. 
C) are located in the lower extremities. 
D) change the position of the hand.

Question 10

A stronger force of muscle contraction develops when additional motor units are stimulated.This is called

Accepted Answer

A) recruitment. 
B) atrophy. 
C) hypertrophy. 
D) myasthenia. 
A) recruitment. 
B) atrophy. 
C) hypertrophy. 
D) myasthenia.

Question 11

"Make like a scarecrow" by contracting which muscle?

Accepted Answer

A) Frontalis 
B) Trapezius 
C) Latissimus dorsi 
D) Deltoid 
A) Frontalis 
B) Trapezius 
C) Latissimus dorsi 
D) Deltoid

Question 12

With regard to skeletal muscle contraction,which event comes first?

Accepted Answer

A) Cross-bridge formation between actin and myosin 
B) Release of calcium from the sarcoplasmic reticulum 
C) Activation of the NM receptor within the neuromuscular junction 
D) Release of neurotransmitter (ACh) from the somatic motor neuron 
A) Cross-bridge formation between actin and myosin 
B) Release of calcium from the sarcoplasmic reticulum 
C) Activation of the NM receptor within the neuromuscular junction 
D) Release of neurotransmitter (ACh) from the somatic motor neuron

Question 13

The purpose of myoglobin is to

Accepted Answer

A) store oxygen. 
B) sequester calcium. 
C) convert lactic acid to glucose. 
D) make the muscle red. 
A) store oxygen. 
B) sequester calcium. 
C) convert lactic acid to glucose. 
D) make the muscle red.

Question 14

Which muscles are located between the ribs and help move the rib cage during breathing?

Accepted Answer

A) Diaphragm 
B) Sternocleidomastoid 
C) Serratus anterior 
D) Intercostal muscles 
A) Diaphragm 
B) Sternocleidomastoid 
C) Serratus anterior 
D) Intercostal muscles

Question 15

Which of the following describes actin and myosin?

Accepted Answer

A) Considered contractile proteins 
B) Form force-generating cross-bridges 
C) Sliding filaments 
D) All of the above 
A) Considered contractile proteins 
B) Form force-generating cross-bridges 
C) Sliding filaments 
D) All of the above

Question 16

Which of the following generates the force that causes the filaments to slide past each other?

Accepted Answer

A) Binding of the acetylcholine to the NM receptor in the neuromuscular junction 
B) The interaction of acetylcholine and cholinesterase 
C) The rotation of the myosin head on the actin 
D) The pumping of calcium into the sarcoplasmic reticulum 
A) Binding of the acetylcholine to the NM receptor in the neuromuscular junction 
B) The interaction of acetylcholine and cholinesterase 
C) The rotation of the myosin head on the actin 
D) The pumping of calcium into the sarcoplasmic reticulum

Question 17

Contraction of the right sternocleidomastoid muscle

Accepted Answer

A) acts antagonistically to the pectoralis major. 
B) acts synergistically with the trapezius. 
C) hyperextends the head. 
D) rotates the head down and to the left. 
A) acts antagonistically to the pectoralis major. 
B) acts synergistically with the trapezius. 
C) hyperextends the head. 
D) rotates the head down and to the left.

Question 18

A tendon

Accepted Answer

A) is a series of sarcomeres. 
B) attaches muscle to bone. 
C) forms the Z line between each sarcomere. 
D) is also called an aponeurosis. 
A) is a series of sarcomeres. 
B) attaches muscle to bone. 
C) forms the Z line between each sarcomere. 
D) is also called an aponeurosis.

Question 19

Acetylcholine is released from the neuron's membrane in response to the

Accepted Answer

A) nerve impulse. 
B) binding of the myosin heads to actin. 
C) release of calcium from the sarcoplasmic reticulum. 
D) inactivation of acetylcholinesterase. 
A) nerve impulse. 
B) binding of the myosin heads to actin. 
C) release of calcium from the sarcoplasmic reticulum. 
D) inactivation of acetylcholinesterase.

Question 20

An aponeurosis

Accepted Answer

A) is flat,sheetlike fascia. 
B) is composed of connective tissue. 
C) forms a site of attachment for skeletal muscle. 
D) All of the above are true. 
A) is flat,sheetlike fascia. 
B) is composed of connective tissue. 
C) forms a site of attachment for skeletal muscle. 
D) All of the above are true.

Exam 9: Muscular System

The force of muscle contraction is most related to the

Which group of muscles is located on the posterior thigh?

Joey has had his leg in a non-weight-bearing cast for 8 weeks.When the cast is removed,the diameter of the leg appears smaller than the uninjured leg.Which term best describes this observation?

Which of the following best describes a sphincter muscle?

Recruitment increases the

With regard to skeletal muscle contraction,which event comes last?

The rectus,transversus,internal oblique,and external oblique refer to

As the electrical signal travels through the T tubules,it causes the

The supinator and pronator muscles

A stronger force of muscle contraction develops when additional motor units are stimulated.This is called

"Make like a scarecrow" by contracting which muscle?

With regard to skeletal muscle contraction,which event comes first?

The purpose of myoglobin is to

Which muscles are located between the ribs and help move the rib cage during breathing?

Which of the following describes actin and myosin?

Which of the following generates the force that causes the filaments to slide past each other?

Contraction of the right sternocleidomastoid muscle

A tendon

Acetylcholine is released from the neuron's membrane in response to the

An aponeurosis

Introduction to the Human Body

Basic Chemistry

Cells

Cell Metabolism

Microbiology Basics

Tissues and Membranes

Integumentary System and Body Temperature

Skeletal System

Nervous System: Nervous Tissue and Brain

Nervous System: Spinal Cord and Peripheral Nerves

Autonomic Nervous System

Sensory System

Endocrine System

Blood

Anatomy of the Heart

Function of the Heart

Anatomy of the Blood Vessels and Special Circulations

Functions of the Blood Vessels

Lymphatic System

Immune System

Respiratory System

Digestive System

Urinary System

Water, Electrolyte, and Acidbase Balance

Reproductive Systems

Human Development and Heredity

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