Question 1

Organize the following parts of a muscle from smallest to largest: muscle fiber, fascicle, myofibril, filament, muscle.

Accepted Answer

A) Myofibril, filament, muscle, fascicle, muscle fiber 
B) Fascicle, filament, muscle fiber, myofibril, muscle 
C) Filament, myofibril, muscle fiber, fascicle, muscle 
D) Filament, muscle fiber, myofibril, fascicle, muscle 
A) Myofibril, filament, muscle, fascicle, muscle fiber 
B) Fascicle, filament, muscle fiber, myofibril, muscle 
C) Filament, myofibril, muscle fiber, fascicle, muscle 
D) Filament, muscle fiber, myofibril, fascicle, muscle

Question 2

The type of muscle cell that lacks transverse tubules, has a single nucleus, and is under involuntary control is

Accepted Answer

A) skeletal muscle. 
B) smooth muscle. 
C) cardiac muscle. 
D) striated muscle. 
A) skeletal muscle. 
B) smooth muscle. 
C) cardiac muscle. 
D) striated muscle.

Question 3

At a neuromuscular junction

Accepted Answer

A) actin and myosin filaments slide past one another. 
B) troponin and tropomyosin exchange places. 
C) neurotransmitters are released. 
D) intercalated discs are synthesized. 
A) actin and myosin filaments slide past one another. 
B) troponin and tropomyosin exchange places. 
C) neurotransmitters are released. 
D) intercalated discs are synthesized.

Question 4

Neurotransmitters are stored in vesicles in

Accepted Answer

A) myofibrils. 
B) motor units. 
C) motor end plates. 
D) motor neuron endings. 
A) myofibrils. 
B) motor units. 
C) motor end plates. 
D) motor neuron endings.

Question 5

An example of a partial but sustained contraction is

Accepted Answer

A) knee jerking. 
B) muscle tone. 
C) a twitch. 
D) eye blinking. 
A) knee jerking. 
B) muscle tone. 
C) a twitch. 
D) eye blinking.

Question 6

Muscles that assist an agonist are called ________.

Accepted Answer

The answer of Muscles that assist an agonist are called...

Question 7

Which of the following is not true?

Accepted Answer

A) Red fibers contract more slowly than white. 
B) Red fibers contain more myoglobin than white. 
C) Red fibers have fewer mitochondria than white. 
D) Red fibers fatigue more slowly than white. 
A) Red fibers contract more slowly than white. 
B) Red fibers contain more myoglobin than white. 
C) Red fibers have fewer mitochondria than white. 
D) Red fibers fatigue more slowly than white.

Question 8

A group of rats are bred in a laboratory to study muscle function. This group possesses a genetic defect that causes troponin to be incorrectly synthesized, making it non-functional. Because of this, the rats are entirely paralyzed. Which of the following correctly explains the impact of the defect on the muscle?

Accepted Answer

A) Troponin can't bind Ca⁺², which stops tropomyosin from pulling away to reveal actin binding spots on the thin filament. 
B) Troponin, when revealed by tropomyosin, won't be able to bind to the myosin heads of the thick filament. 
C) Troponin won't pull away to reveal the actin binding spots of the thin filament after tropomyosin binds Ca⁺². 
D) Troponin, when revealed by actin, won't be able to bind to the myosin heads of the thick filament. 
A) Troponin can't bind Ca⁺², which stops tropomyosin from pulling away to reveal actin binding spots on the thin filament. 
B) Troponin, when revealed by tropomyosin, won't be able to bind to the myosin heads of the thick filament. 
C) Troponin won't pull away to reveal the actin binding spots of the thin filament after tropomyosin binds Ca⁺². 
D) Troponin, when revealed by actin, won't be able to bind to the myosin heads of the thick filament.

Question 9

While examining a sample of muscle tissue under a microscope, you notice that the cells have a single nucleus. The fibers are striated and heavily branched. Which muscle type does this sample contain?

Accepted Answer

A) Skeletal muscle 
B) Smooth muscle 
C) Cardiac muscle 
D) Striated muscle 
A) Skeletal muscle 
B) Smooth muscle 
C) Cardiac muscle 
D) Striated muscle

Question 10

Many muscles are named for their location (origin and insertion)in the body, particularly in relation to bones. In what body region would you expect the frontalis muscle to originate?

Accepted Answer

A) The thoracic region 
B) The abdominal region 
C) The pelvic region 
D) The cranium 
A) The thoracic region 
B) The abdominal region 
C) The pelvic region 
D) The cranium

Question 11

Organize the following muscular connective tissues from smallest to largest: epimysium, perimysium, fascia, endomysium.

Accepted Answer

A) Perimysium, epimysium, endomysium, fascia 
B) Fascia, endomysium, perimysium, epimysium 
C) Fascia, epimysium, perimysium, endomysium 
D) Endomysium, perimysium, epimysium, fascia 
A) Perimysium, epimysium, endomysium, fascia 
B) Fascia, endomysium, perimysium, epimysium 
C) Fascia, epimysium, perimysium, endomysium 
D) Endomysium, perimysium, epimysium, fascia

Question 12

Certain natural plant poisons and animal venoms contain substances that inhibit the function of acetylcholinesterase. If a person is poisoned by one of these substances, which of the following will be the cause of their symptoms?

Accepted Answer

A) Their muscles won't be able to contract because no acetylcholine will be released from the neuronal membrane. 
B) Their muscles will be in a constant state of contraction because acetylcholine won't be broken down and cleared from the neuromuscular junction. 
C) Their muscles won't be able to contract because acetylcholine will be attacked and degraded immediately after release from the neuron. 
D) Their muscles won't be able to contract because acetylcholine won't be properly synthesized by acetylcholinesterase. 
A) Their muscles won't be able to contract because no acetylcholine will be released from the neuronal membrane. 
B) Their muscles will be in a constant state of contraction because acetylcholine won't be broken down and cleared from the neuromuscular junction. 
C) Their muscles won't be able to contract because acetylcholine will be attacked and degraded immediately after release from the neuron. 
D) Their muscles won't be able to contract because acetylcholine won't be properly synthesized by acetylcholinesterase.

Question 13

Binding sites on the surface of actin allow the formation of cross-bridges with molecules of

Accepted Answer

A) ATP. 
B) myosin. 
C) troponin. 
D) tropomyosin. 
A) ATP. 
B) myosin. 
C) troponin. 
D) tropomyosin.

Question 14

A motor neuron and the muscle fibers that it controls constitute a motor unit.

Accepted Answer

A) True 
 B)False

Question 15

As you walk, your gastrocnemius muscle (calf muscle)contracts, shortening and causing plantar flexion from the ankle. This muscle contraction is describing as being ________.

Accepted Answer

The answer of As you walk, your gastrocnemius muscle (calf...

Question 16

A myogram is

Accepted Answer

A) a chart that shows how many muscle cells a neuron synapses with. 
B) a recording of the events of a twitch. 
C) a measurement of muscle tone. 
D) a depiction of the results of a stress test. 
A) a chart that shows how many muscle cells a neuron synapses with. 
B) a recording of the events of a twitch. 
C) a measurement of muscle tone. 
D) a depiction of the results of a stress test.

Question 17

The structures that connect cardiac muscle cells are

Accepted Answer

A) intervertebral discs. 
B) neuromuscular junctions. 
C) intercalated discs. 
D) motor end plates. 
A) intervertebral discs. 
B) neuromuscular junctions. 
C) intercalated discs. 
D) motor end plates.

Question 18

Temporomandibular joint (TMJ)syndrome causes

Accepted Answer

A) tooth loss. 
B) atrophy in facial muscles like the masseter. 
C) clicking sound from the jaw. 
D) excessive innervation of facial muscles. 
A) tooth loss. 
B) atrophy in facial muscles like the masseter. 
C) clicking sound from the jaw. 
D) excessive innervation of facial muscles.

Question 19

You bend your arms at the elbow and forcefully press your palms into each other. Your hands do not move and the muscles of your upper arms do not shorten, but tension greatly increases in them. This muscle contraction is described as being ________.

Accepted Answer

The answer of You bend your arms at the elbow...

Question 20

The enzyme acetylecholinesterase causes acetylcholine to

Accepted Answer

A) bind to actin. 
B) be secreted from the motor end plate. 
C) decompose. 
D) form cross-bridges. 
A) bind to actin. 
B) be secreted from the motor end plate. 
C) decompose. 
D) form cross-bridges.

Exam 9: Muscular System

Organize the following parts of a muscle from smallest to largest: muscle fiber, fascicle, myofibril, filament, muscle.

The type of muscle cell that lacks transverse tubules, has a single nucleus, and is under involuntary control is

At a neuromuscular junction

Neurotransmitters are stored in vesicles in

An example of a partial but sustained contraction is

Muscles that assist an agonist are called ________.

Which of the following is not true?

While examining a sample of muscle tissue under a microscope, you notice that the cells have a single nucleus. The fibers are striated and heavily branched. Which muscle type does this sample contain?

Many muscles are named for their location (origin and insertion)in the body, particularly in relation to bones. In what body region would you expect the frontalis muscle to originate?

Organize the following muscular connective tissues from smallest to largest: epimysium, perimysium, fascia, endomysium.

Certain natural plant poisons and animal venoms contain substances that inhibit the function of acetylcholinesterase. If a person is poisoned by one of these substances, which of the following will be the cause of their symptoms?

Binding sites on the surface of actin allow the formation of cross-bridges with molecules of

A motor neuron and the muscle fibers that it controls constitute a motor unit.

As you walk, your gastrocnemius muscle (calf muscle)contracts, shortening and causing plantar flexion from the ankle. This muscle contraction is describing as being ________.

A myogram is

The structures that connect cardiac muscle cells are

Temporomandibular joint (TMJ)syndrome causes

You bend your arms at the elbow and forcefully press your palms into each other. Your hands do not move and the muscles of your upper arms do not shorten, but tension greatly increases in them. This muscle contraction is described as being ________.

The enzyme acetylecholinesterase causes acetylcholine to

Introduction to Human Anatomy and Physiology

Chemical Basis of Life

Cells

Cellular Metabolism

Tissues

Integumentary System

Skeletal System

Joints of the Skeletal System

Nervous System I: Basic Structure and Function

Nervous System II: Divisions of the Nervous System

Nervous System III: Senses

Endocrine System

Blood

Cardiovascular System

Lymphatic System and Immunity

Digestive System

Nutrition and Metabolism

Respiratory System

Urinary System

Water, Electrolyte, and Acid-Base Balance

Reproductive Systems

Pregnancy, Growth, and Development

Genetics and Genomics

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