Question 1

Because the heart beats continuously, cardiac fibers never relax completely.

Accepted Answer

A) True 
 B)False

Question 2

Muscles can only pull; they cannot push.

Accepted Answer

A) True 
 B)False

Question 3

One sarcomere

Accepted Answer

A)  extends from Z line to Z line. 
B)  is composed of many myofibrils. 
C)  contains only actin fibers. 
D)  is composed of many muscle fibers. 
E)  surrounds each muscle in the body. 
A)  extends from Z line to Z line. 
B)  is composed of many myofibrils. 
C)  contains only actin fibers. 
D)  is composed of many muscle fibers. 
E)  surrounds each muscle in the body.

Question 4

Leiomyomas are a type of smooth muscle cancer that occurs in the uterine wall.

Accepted Answer

A) True 
 B)False

Question 5

Of the three types of muscle tissue, which has multinucleated fibers?

Accepted Answer

A)  smooth muscle 
B)  cardiac muscle 
C)  skeletal muscle 
D)  both smooth and skeletal muscles 
E)  both cardiac and smooth muscles 
A)  smooth muscle 
B)  cardiac muscle 
C)  skeletal muscle 
D)  both smooth and skeletal muscles 
E)  both cardiac and smooth muscles

Question 6

Which muscle injury is characterized by a twisting of a joint leading to swelling and injury?

Accepted Answer

A)  sprain 
B)  strain 
C)  tendinitis 
D)  bursitis 
E)  myalgia 
A)  sprain 
B)  strain 
C)  tendinitis 
D)  bursitis 
E)  myalgia

Question 7

What supplies the energy for muscle contraction?

Accepted Answer

A)  actin 
B)  myosin 
C)  tropomyosin 
D)  ATP 
E)  Ca2+ 
A)  actin 
B)  myosin 
C)  tropomyosin 
D)  ATP 
E)  Ca2+

Question 8

What do smooth, cardiac, and skeletal muscle all have in common?

Accepted Answer

A)  They are all uninucleated. 
B)  They are all striated. 
C)  They are all found in the walls of blood vessels. 
D)  The cells of these muscles are all called muscle fibers. 
E)  They all interlock at intercalated disks. 
A)  They are all uninucleated. 
B)  They are all striated. 
C)  They are all found in the walls of blood vessels. 
D)  The cells of these muscles are all called muscle fibers. 
E)  They all interlock at intercalated disks.

Question 9

What is the biggest muscle in terms of mass) in the body?

Accepted Answer

A)  gluteus maximus 
B)  sartorius 
C)  stapedius 
D)  quadriceps femoris 
E)  latissimus dorsi 
A)  gluteus maximus 
B)  sartorius 
C)  stapedius 
D)  quadriceps femoris 
E)  latissimus dorsi

Question 10

Which of the following is not a term that refers to how muscles work?

Accepted Answer

A)  prime mover 
B)  synergists 
C)  antagonist 
D)  synergism 
E)  origin 
A)  prime mover 
B)  synergists 
C)  antagonist 
D)  synergism 
E)  origin

Question 11

What does the word sarco mean?

Accepted Answer

A)  large 
B)  short 
C)  muscle 
D)  tubule 
E)  smooth 
A)  large 
B)  short 
C)  muscle 
D)  tubule 
E)  smooth

Question 12

Why is the innervation ratio in the ocular muscles one motor axon per 23 muscle fibers, whereas in the gastrocnemius muscle, it is one motor axon per 1,000 muscle fibers?

Accepted Answer

A)  There are more nerves in the upper body than in the lower extremities. 
B)  The ocular muscles require finer control than moving the legs. 
C)  The innervation ratio has to do with the overall size of the muscle- the bigger the muscle, the fewer the muscle fibers per motor axon. 
D)  The gastrocnemius muscle contracts much harder than the ocular muscles do. 
E)  There are fewer muscle fibers in the gastrocnemius muscle than in the ocular muscles. 
A)  There are more nerves in the upper body than in the lower extremities. 
B)  The ocular muscles require finer control than moving the legs. 
C)  The innervation ratio has to do with the overall size of the muscle- the bigger the muscle, the fewer the muscle fibers per motor axon. 
D)  The gastrocnemius muscle contracts much harder than the ocular muscles do. 
E)  There are fewer muscle fibers in the gastrocnemius muscle than in the ocular muscles.

Question 13

What happens when the arrector pili muscles contract?

Accepted Answer

A)  Your head nods "yes." 
B)  Your leg kicks out. 
C)  The hairs on your skin stand on end. 
D)  The blood from your skin is rerouted to your core. 
E)  You tap your finger. 
A)  Your head nods "yes." 
B)  Your leg kicks out. 
C)  The hairs on your skin stand on end. 
D)  The blood from your skin is rerouted to your core. 
E)  You tap your finger.

Question 14

What ion is responsible for initiating muscle contraction?

Accepted Answer

A)  Mg2+ 
B)  Ca2+ 
C)  H+ 
D)  Cl- 
E)  Na+ 
A)  Mg2+ 
B)  Ca2+ 
C)  H+ 
D)  Cl- 
E)  Na+

Question 15

What is the difference between a tic and a spasm?

Accepted Answer

A)  A tic is a spasm that can be controlled voluntarily. 
B)  A tic is a strong and very painful spasm, especially of the leg and foot. 
C)  A tic is caused by stretching or tearing of a muscle, while a spasm is just an involuntary contraction. 
D)  A tic is caused by the inflammation of a tendon, while a spasm is just an involuntary contraction. 
E)  A tic refers to achy muscles, usually due to overexercise, while a spasm is just an involuntary contraction. 
A)  A tic is a spasm that can be controlled voluntarily. 
B)  A tic is a strong and very painful spasm, especially of the leg and foot. 
C)  A tic is caused by stretching or tearing of a muscle, while a spasm is just an involuntary contraction. 
D)  A tic is caused by the inflammation of a tendon, while a spasm is just an involuntary contraction. 
E)  A tic refers to achy muscles, usually due to overexercise, while a spasm is just an involuntary contraction.

Question 16

Temperature-sensitive neurons in the skin are responsible for initiating shivering.

Accepted Answer

A) True 
 B)False

Question 17

Jillian is a top-level cross-country runner due to her having predominantly slow-twitch muscle fibers.

Accepted Answer

A) True 
 B)False

Question 18

What is the name of a sudden and involuntary muscular contraction, often accompanied by pain?

Accepted Answer

A)  bursitis 
B)  sprain 
C)  strain 
D)  tic 
E)  spasm 
A)  bursitis 
B)  sprain 
C)  strain 
D)  tic 
E)  spasm

Question 19

What is found within the intercalated disks of cardiac muscle?

Accepted Answer

A)  sarcoplasmic reticulum 
B)  gap junctions 
C)  dense connective tissue 
D)  bone 
E)  myoglobin 
A)  sarcoplasmic reticulum 
B)  gap junctions 
C)  dense connective tissue 
D)  bone 
E)  myoglobin

Question 20

One motor unit obeys a principle called the all-or-none law.

Accepted Answer

A) True 
 B)False

Exam 13: Muscular System

Because the heart beats continuously, cardiac fibers never relax completely.

Muscles can only pull; they cannot push.

One sarcomere

Leiomyomas are a type of smooth muscle cancer that occurs in the uterine wall.

Of the three types of muscle tissue, which has multinucleated fibers?

Which muscle injury is characterized by a twisting of a joint leading to swelling and injury?

What supplies the energy for muscle contraction?

What do smooth, cardiac, and skeletal muscle all have in common?

What is the biggest muscle in terms of mass) in the body?

Which of the following is not a term that refers to how muscles work?

What does the word sarco mean?

Why is the innervation ratio in the ocular muscles one motor axon per 23 muscle fibers, whereas in the gastrocnemius muscle, it is one motor axon per 1,000 muscle fibers?

What happens when the arrector pili muscles contract?

What ion is responsible for initiating muscle contraction?

What is the difference between a tic and a spasm?

Temperature-sensitive neurons in the skin are responsible for initiating shivering.

Jillian is a top-level cross-country runner due to her having predominantly slow-twitch muscle fibers.

What is the name of a sudden and involuntary muscular contraction, often accompanied by pain?

What is found within the intercalated disks of cardiac muscle?

One motor unit obeys a principle called the all-or-none law.

Human Organization

Chemistery of Life

Cell Structure and Function

Torganization and Regulation of Body Systems

Cardiovascular System : Heart and Blood Vessels

Cardiovascular System : Blood

The Lumphatic and Immune Systems

Biology of Infectious Diseases

Digestive System and Nutrition

Respiratory System

Urinary System

Skeletal System

Nervous System

Senses

Endocring System

Reproductive System

Development and Aging

Patterns of Chromosome Inheritance

Cancer

Patterns of Genetic Inheritance

Dna Piology and Technology

Hummen Evolution

Ecology and the Nature of Ecosystems

Hummen Interactions With the Biosphere

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