Question 1

Functions of muscles include

Accepted Answer

A)  heartbeat. 
B)  muscle tone. 
C)  moving bones. 
D)  all of the above. 
A)  heartbeat. 
B)  muscle tone. 
C)  moving bones. 
D)  all of the above.

Question 2

The enzyme ATPase occurs in the globular portion of myosin molecules.

Accepted Answer

A) True 
 B)False

Question 3

Bones and muscles function as mechanical devices called

Accepted Answer

A)  lifts. 
B)  levers. 
C)  syncytia. 
D)  ladders. 
A)  lifts. 
B)  levers. 
C)  syncytia. 
D)  ladders.

Question 4

Athletes usually experience muscle fatigue less quickly than nonathletes because they

Accepted Answer

A)  convert glucose to lactic acid. 
B)  tolerate high concentrations of carbon dioxide. 
C)  make more efficient use of ATP. 
D)  produce less lactic acid. 
A)  convert glucose to lactic acid. 
B)  tolerate high concentrations of carbon dioxide. 
C)  make more efficient use of ATP. 
D)  produce less lactic acid.

Question 5

A muscle that assists the agonist is a(n)

Accepted Answer

A)  antagonist. 
B)  prime mover. 
C)  mediator. 
D)  synergist. 
A)  antagonist. 
B)  prime mover. 
C)  mediator. 
D)  synergist.

Question 6

Short muscle cells with centrally located nuclei are

Accepted Answer

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

Question 7

Both acetylcholine and norepinephrine can affect

Accepted Answer

A)  smooth muscle contraction. 
B)  skeletal muscle contraction. 
C)  synthesis of actin and myosin. 
D)  exercise tolerance. 
A)  smooth muscle contraction. 
B)  skeletal muscle contraction. 
C)  synthesis of actin and myosin. 
D)  exercise tolerance.

Question 8

A motor unit is

Accepted Answer

A)  many myofibrils in a sarcolemma. 
B)  many motor end plates at a neuromuscular junction. 
C)  a motor neuron and the muscle fibers connected to it. 
D)  the functional unit of a muscle fiber. 
A)  many myofibrils in a sarcolemma. 
B)  many motor end plates at a neuromuscular junction. 
C)  a motor neuron and the muscle fibers connected to it. 
D)  the functional unit of a muscle fiber.

Question 9

Arrange the following steps of muscle fiber contraction in the correct sequence.
1) The muscle impulse reaches the sarcoplasmic reticulum and calcium is released.
2) Thin filaments are pulled over the thick filaments.
3) Calcium floods the sarcoplasm and binds to troponin molecules leaving active sites.
4) The impulse arrives at the synapse and travels through the transverse tubules.
5) The muscle fiber shortens and contracts.
6) Myosin heads bind to exposed active sites on actin, forming cross-bridges.
7-30-2013

Accepted Answer

A)  4, 1, 3, 5, 6, 2 
B)  4, 1, 3, 2, 6, 5 
C)  4, 1, 3, 6, 2, 5 
D)  4, 3, 6, 2, 5, 1 
A)  4, 1, 3, 5, 6, 2 
B)  4, 1, 3, 2, 6, 5 
C)  4, 1, 3, 6, 2, 5 
D)  4, 3, 6, 2, 5, 1

Functions of muscles include

The enzyme ATPase occurs in the globular portion of myosin molecules.

Bones and muscles function as mechanical devices called

Athletes usually experience muscle fatigue less quickly than nonathletes because they

A muscle that assists the agonist is a(n)

Short muscle cells with centrally located nuclei are

Both acetylcholine and norepinephrine can affect

A motor unit is

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: Division 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-Based Balance

Reproductive Systems

Pregnancy, Growth, and Development

Genetics and Genomics

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Exam 9: Muscular System

Functions of muscles include

The enzyme ATPase occurs in the globular portion of myosin molecules.

Bones and muscles function as mechanical devices called

Athletes usually experience muscle fatigue less quickly than nonathletes because they

A muscle that assists the agonist is a(n)

Short muscle cells with centrally located nuclei are

Both acetylcholine and norepinephrine can affect

A motor unit is

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: Division 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-Based Balance

Reproductive Systems

Pregnancy, Growth, and Development

Genetics and Genomics

Filters