Question 1

If you lock your knees while standing, you may pass out because of the lack of venous return to the heart.

Accepted Answer

A) True 
 B)False  True

Question 2

When a muscle contracts, the H band almost disappears.

Accepted Answer

A) True 
 B)False  True

Question 3

What muscle works in a pair with the biceps brachii?

Accepted Answer

A)  the triceps brachii 
B)  the trapezius 
C)  the masseter 
D)  the pectoralis major 
E)  the sartorius 
A)  the triceps brachii 
B)  the trapezius 
C)  the masseter 
D)  the pectoralis major 
E)  the sartorius A

Question 4

When the nerve signal reaches the axon terminal, what happens next?

Accepted Answer

A)  The muscle contracts. 
B)  The synaptic vesicles release neurotransmitter. 
C)  An electrical signal is formed that jumps the synaptic cleft. 
D)  H+ is pumped into the synaptic cleft. 
E)  Myosin is released from the axon terminal. 
A)  The muscle contracts. 
B)  The synaptic vesicles release neurotransmitter. 
C)  An electrical signal is formed that jumps the synaptic cleft. 
D)  H+ is pumped into the synaptic cleft. 
E)  Myosin is released from the axon terminal.

Question 5

What structure attaches a muscle to a bone?

Accepted Answer

A)  ligaments 
B)  tendons 
C)  bursae 
D)  sarcolemma 
E)  sarcoplasm 
A)  ligaments 
B)  tendons 
C)  bursae 
D)  sarcolemma 
E)  sarcoplasm

Question 6

What does troponin bind to, and what happens when it binds?

Accepted Answer

A)  Ca2+; tropomyosin shifts 
B)  tropomyosin; the sarcomere relaxes 
C)  acetylcholine; the sarcomere shortens 
D)  ATP; tropomyosin returns to normal position 
E)  T tubules; the sarcomere shortens 
A)  Ca2+; tropomyosin shifts 
B)  tropomyosin; the sarcomere relaxes 
C)  acetylcholine; the sarcomere shortens 
D)  ATP; tropomyosin returns to normal position 
E)  T tubules; the sarcomere shortens

Question 7

Which disease is an autoimmune disease characterized by weakness that especially affects the muscles of the eyelids, face, neck, and extremities?

Accepted Answer

A)  myalgia 
B)  muscular dystrophy 
C)  myasthenia gravis 
D)  tendinitis 
E)  bursitis 
A)  myalgia 
B)  muscular dystrophy 
C)  myasthenia gravis 
D)  tendinitis 
E)  bursitis

Question 8

Why are slow-twitch muscles dark?

Accepted Answer

A)  They have many more myofibrils per motor unit than fast-twitch fibers. 
B)  They are designed for strength and explosions of energy. 
C)  They need less blood than fast-twitch fibers. 
D)  They contain myoglobin. 
E)  They have fewer mitochondria. 
A)  They have many more myofibrils per motor unit than fast-twitch fibers. 
B)  They are designed for strength and explosions of energy. 
C)  They need less blood than fast-twitch fibers. 
D)  They contain myoglobin. 
E)  They have fewer mitochondria.

Question 9

Fibromyalgia is a temporary condition of achy muscles, usually due to overuse.

Accepted Answer

A) True 
 B)False

Question 10

List the functions of the skeletal muscles.

Accepted Answer

1. Support of the body.
2. Movement of t

Question 11

Explain the structural differences between the thick and thin myofilaments.

Accepted Answer

A THICK FILAMENT IS COMPOSED OF SEVERAL

Question 12

What is the name of the small gap that separates the axon terminal of a nerve from the sarcolemma?

Accepted Answer

A)  T tubule 
B)  sliding filament 
C)  synaptic cleft 
D)  synaptic vesicle 
E)  sarcoplasmic reticulum 
A)  T tubule 
B)  sliding filament 
C)  synaptic cleft 
D)  synaptic vesicle 
E)  sarcoplasmic reticulum

Question 13

Which of the following is not an energy source for muscle contraction?

Accepted Answer

A)  glycogen 
B)  triglycerides 
C)  glucose 
D)  fatty acids 
E)  starch 
A)  glycogen 
B)  triglycerides 
C)  glucose 
D)  fatty acids 
E)  starch

Question 14

From the outside of a muscle coming in, the first thing encountered would be

Accepted Answer

A)  fascia. 
B)  fascicle. 
C)  dense connective tissue. 
D)  muscle fiber. 
E)  myofibril. 
A)  fascia. 
B)  fascicle. 
C)  dense connective tissue. 
D)  muscle fiber. 
E)  myofibril.

Question 15

Which of the following is not a phase of a single muscle twitch?

Accepted Answer

A)  stimulation period 
B)  latent period 
C)  contraction period 
D)  relaxation period 
E)  None of these are phases of a muscle twitch. 
A)  stimulation period 
B)  latent period 
C)  contraction period 
D)  relaxation period 
E)  None of these are phases of a muscle twitch.

Question 16

In good muscle tone, how many motor units are contracted?

Accepted Answer

A)  none 
B)  some 
C)  all 
D)  5-10% of the motor units 
E)  10-15% of the motor units 
A)  none 
B)  some 
C)  all 
D)  5-10% of the motor units 
E)  10-15% of the motor units

Question 17

Skeletal muscle contractions play a role in returning the venous blood to the heart.

Accepted Answer

A) True 
 B)False

Question 18

What happens to the actin and myosin filaments when a muscle contracts?

Accepted Answer

A)  Both of them shorten. 
B)  Both of them lengthen. 
C)  Both stay the same length. 
D)  Actin shortens, while myosin lengthens. 
E)  Myosin shortens, while actin lengthens. 
A)  Both of them shorten. 
B)  Both of them lengthen. 
C)  Both stay the same length. 
D)  Actin shortens, while myosin lengthens. 
E)  Myosin shortens, while actin lengthens.

Question 19

What information does the word rectus give you about a muscle?

Accepted Answer

A)  the size of the muscle fibers 
B)  the attachment of the muscle fibers 
C)  the action of the muscle fibers 
D)  the shape of the muscle fibers 
E)  the direction of muscle fibers 
A)  the size of the muscle fibers 
B)  the attachment of the muscle fibers 
C)  the action of the muscle fibers 
D)  the shape of the muscle fibers 
E)  the direction of muscle fibers

Question 20

Contraction of a muscle requires all the motor units to be undergoing tetanic contraction.

Accepted Answer

A) True 
 B)False

Exam 13: Muscular System

If you lock your knees while standing, you may pass out because of the lack of venous return to the heart.

When a muscle contracts, the H band almost disappears.

What muscle works in a pair with the biceps brachii?

When the nerve signal reaches the axon terminal, what happens next?

What structure attaches a muscle to a bone?

What does troponin bind to, and what happens when it binds?

Which disease is an autoimmune disease characterized by weakness that especially affects the muscles of the eyelids, face, neck, and extremities?

Why are slow-twitch muscles dark?

Fibromyalgia is a temporary condition of achy muscles, usually due to overuse.

List the functions of the skeletal muscles.

Explain the structural differences between the thick and thin myofilaments.

What is the name of the small gap that separates the axon terminal of a nerve from the sarcolemma?

Which of the following is not an energy source for muscle contraction?

From the outside of a muscle coming in, the first thing encountered would be

Which of the following is not a phase of a single muscle twitch?

In good muscle tone, how many motor units are contracted?

Skeletal muscle contractions play a role in returning the venous blood to the heart.

What happens to the actin and myosin filaments when a muscle contracts?

What information does the word rectus give you about a muscle?

Contraction of a muscle requires all the motor units to be undergoing tetanic contraction.

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

Filters