Question 1

In a motor unit, each neuron innervates (controls)a single muscle fiber.

Accepted Answer

A) True 
 B)False  False

Question 2

The connective tissue layer that surrounds each bundle of muscle fibers is called the

Accepted Answer

A) endomysium. 
B) fascicle. 
C) perimysium. 
D) fascia. 
E) epimysium. 
A) endomysium. 
B) fascicle. 
C) perimysium. 
D) fascia. 
E) epimysium. C

Question 3

A particular muscle causes flexion of the lower limb at the knee. It is located on the posterior side of the thigh. Where would you expect to find its antagonist?

Accepted Answer

A) On the medial side of the thigh 
B) On the anterior side of the thigh 
C) On the lateral side of the thigh 
D) On the posterior side of the thigh too 
E) On any side of the thigh 
A) On the medial side of the thigh 
B) On the anterior side of the thigh 
C) On the lateral side of the thigh 
D) On the posterior side of the thigh too 
E) On any side of the thigh B

Question 4

What does "striated" mean, as it applies to skeletal muscle?

Accepted Answer

A) It means that skeletal muscle action can be willed to occur. 
B) It means that skeletal muscle appears striped, due to alternating Z and M lines in each sarcomere. 
C) It means that the tissue appears striped, due to the pattern formed by multinucleated cells. 
D) It means that skeletal muscle tissue consists of motor units. 
E) It means that the tissue appears striped, due to the repeating pattern of the A bands and I bands in the sarcomeres. 
A) It means that skeletal muscle action can be willed to occur. 
B) It means that skeletal muscle appears striped, due to alternating Z and M lines in each sarcomere. 
C) It means that the tissue appears striped, due to the pattern formed by multinucleated cells. 
D) It means that skeletal muscle tissue consists of motor units. 
E) It means that the tissue appears striped, due to the repeating pattern of the A bands and I bands in the sarcomeres.

Question 5

A skeletal muscle is considered to be an organ of the muscular system.

Accepted Answer

A) True 
 B)False

Question 6

The boundary between adjacent sarcomeres is the

Accepted Answer

A) A band 
B) H zone 
C) Z line (disc) 
D) I band 
E) M line 
A) A band 
B) H zone 
C) Z line (disc) 
D) I band 
E) M line

Question 7

Whenever an object is lifted, all motor units in the appropriate muscle(s)are stimulated, regardless of the weight of the object.

Accepted Answer

A) True 
 B)False

Question 8

A muscle that contracts to assist the main muscle in performing a particular action is called a(n)

Accepted Answer

A) prime mover. 
B) fixator. 
C) antagonist. 
D) agonist. 
E) synergist. 
A) prime mover. 
B) fixator. 
C) antagonist. 
D) agonist. 
E) synergist.

Question 9

A muscle can serve as an agonist in one action and an antagonist in another action.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following does NOT occur as a sarcomere shortens during muscle contraction?

Accepted Answer

A) The thin and thick myofilaments shorten in length. 
B) The I bands shorten. 
C) The Z lines (discs)move closer together. 
D) The H zone shortens. 
E) All of these occur as a sarcomere shortens. 
A) The thin and thick myofilaments shorten in length. 
B) The I bands shorten. 
C) The Z lines (discs)move closer together. 
D) The H zone shortens. 
E) All of these occur as a sarcomere shortens.

Question 11

A sheet of connective tissue, which connects muscles (or parts of muscles)to other muscles (or their parts), is called a(n)

Accepted Answer

A) tendon. 
B) aponeurosis. 
C) fascia. 
D) fascicle. 
E) sarcolemma. 
A) tendon. 
B) aponeurosis. 
C) fascia. 
D) fascicle. 
E) sarcolemma.

Question 12

Which of the following organelles stores calcium in skeletal muscle fibers for contraction?

Accepted Answer

A) Mitochondria 
B) Transverse tubules 
C) Sarcolemma 
D) Sarcoplasm 
E) Sarcoplasmic reticulum 
A) Mitochondria 
B) Transverse tubules 
C) Sarcolemma 
D) Sarcoplasm 
E) Sarcoplasmic reticulum

Question 13

Which of the following is NOT a method of naming muscles?

Accepted Answer

A) By the relative size of the muscle 
B) By the action of the muscle 
C) By the number of origins that the muscle has 
D) By the shape of the muscle 
E) All of these are methods of naming muscles. 
A) By the relative size of the muscle 
B) By the action of the muscle 
C) By the number of origins that the muscle has 
D) By the shape of the muscle 
E) All of these are methods of naming muscles.

Question 14

A muscle fiber is identical to a muscle cell.

Accepted Answer

A) True 
 B)False

Question 15

Which region of a sarcomere contains thick filaments overlapping with thin filaments?

Accepted Answer

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

Question 16

Which of the following is NOT true of a myofibril?

Accepted Answer

A) Thin myofilaments consist of actin, troponin, and tropomyosin. 
B) Elastic filaments are composed of titin. 
C) Thick myofilaments consist of myosin. 
D) Myofibrils are composed of muscle fibers. 
E) All of these are true of myofibrils. 
A) Thin myofilaments consist of actin, troponin, and tropomyosin. 
B) Elastic filaments are composed of titin. 
C) Thick myofilaments consist of myosin. 
D) Myofibrils are composed of muscle fibers. 
E) All of these are true of myofibrils.

Question 17

What is the role of tropomyosin in a sarcomere?

Accepted Answer

A) It is the main protein component of thin myofilaments. 
B) It blocks the active sites on actin filaments in relaxed muscle fibers. 
C) It is the main component of elastic filaments. 
D) It is the main protein component in thick myofilaments. 
E) It binds to calcium to initiate muscle contraction. 
A) It is the main protein component of thin myofilaments. 
B) It blocks the active sites on actin filaments in relaxed muscle fibers. 
C) It is the main component of elastic filaments. 
D) It is the main protein component in thick myofilaments. 
E) It binds to calcium to initiate muscle contraction.

Question 18

The origin of a skeletal muscle is the attachment site at the less moveable/more stationary end.

Accepted Answer

A) True 
 B)False

Question 19

The synaptic knob of a neuromuscular junction is the portion of the muscle fiber that contains receptor sites for neurotransmitters.

Accepted Answer

A) True 
 B)False

Question 20

What is a fascicle of a skeletal muscle?

Accepted Answer

A) A layer of connective tissue surrounding an entire skeletal muscle 
B) A contractile unit of a myofibril 
C) An inward extension of the sarcolemma through the muscle fiber 
D) A bundle of skeletal muscle fibers 
E) A motor neuron and all of the muscle fibers that it innervates 
A) A layer of connective tissue surrounding an entire skeletal muscle 
B) A contractile unit of a myofibril 
C) An inward extension of the sarcolemma through the muscle fiber 
D) A bundle of skeletal muscle fibers 
E) A motor neuron and all of the muscle fibers that it innervates

Exam 20: Skeletal Muscle Structure and Function

In a motor unit, each neuron innervates (controls)a single muscle fiber.

The connective tissue layer that surrounds each bundle of muscle fibers is called the

A particular muscle causes flexion of the lower limb at the knee. It is located on the posterior side of the thigh. Where would you expect to find its antagonist?

What does "striated" mean, as it applies to skeletal muscle?

A skeletal muscle is considered to be an organ of the muscular system.

The boundary between adjacent sarcomeres is the

Whenever an object is lifted, all motor units in the appropriate muscle(s)are stimulated, regardless of the weight of the object.

A muscle that contracts to assist the main muscle in performing a particular action is called a(n)

A muscle can serve as an agonist in one action and an antagonist in another action.

Which of the following does NOT occur as a sarcomere shortens during muscle contraction?

A sheet of connective tissue, which connects muscles (or parts of muscles)to other muscles (or their parts), is called a(n)

Which of the following organelles stores calcium in skeletal muscle fibers for contraction?

Which of the following is NOT a method of naming muscles?

A muscle fiber is identical to a muscle cell.

Which region of a sarcomere contains thick filaments overlapping with thin filaments?

Which of the following is NOT true of a myofibril?

What is the role of tropomyosin in a sarcomere?

The origin of a skeletal muscle is the attachment site at the less moveable/more stationary end.

The synaptic knob of a neuromuscular junction is the portion of the muscle fiber that contains receptor sites for neurotransmitters.

What is a fascicle of a skeletal muscle?

Scientific Method and Measurements

Body Organization, Membranes, and Terminology

Chemistry of Life

Care and Use of the Microscope

Cell Structure and Function

Movements Through Membranes

Cell Cycle

Epithelial Tissues

Connective Tissues

Muscle and Nervous Tissues

Integumentary System

Bone Structure and Classification

Organization of the Skeleton

Skull

Vertebral Column and Thoracic Cage

Pectoral Girdle and Upper Limb

Pelvic Girdle and Lower Limb

Fetal Skeleton

Joint Structure and Movements

Electromyography: Biopac Exercise

Muscles of the Head and Neck

Muscles of the Chest, Shoulder, and Upper Limb

Muscles of the Vertebral Column, Abdominal Wall, and Pelvic Floor

Muscles of the Hip and Lower Limb

Surface Anatomy

Nervous Tissue and Nerves

Meninges, Spinal Cord, and Spinal Nerves

Reflex Arc and Somatic Reflexes

Brain and Cranial Nerves

Reaction Time: Biopac Exercise

Electroencephalography I: Biopac Exercise

Dissection of the Sheep Brain

General Senses

Smell and Taste

Eye Structure

Visual Tests and Demonstrations

Ear and Hearing

Ear and Equilibrium

Endocrine Structure and Function

Diabetic Physiology

Blood Cells

Blood Testing

Blood Typing

Heart Structure

Cardiac Cycle

Electrocardiography: Biopac Exercise

Blood Vessel Structure, Arteries, and Veins

Pulse Rate and Blood Pressure

Lymphatic System

Respiratory Organs

Breathing and Respiratory Volumes

Spirometry: Biopac Exercise

Control of Breathing

Digestive Organs

Action of a Digestive Enzyme

Metabolism

Urinary Organs

Urinalysis

Male Reproductive System