Question 1

The sliding-filament theory is the current model of muscle contraction.

Accepted Answer

A) True 
 B)False  True

Question 2

Bundles of fine fibers that extend lengthwise along muscle fibers are called:

Accepted Answer

A)  myofibrils. 
B)  myofilaments. 
C)  striae. 
D)  sarcoplasmic reticulum. 
A)  myofibrils. 
B)  myofilaments. 
C)  striae. 
D)  sarcoplasmic reticulum. A

Question 3

Muscles with less than normal muscle tone are called spastic.

Accepted Answer

A) True 
 B)False  False

Question 4

Myofibrils make up myofilaments.

Accepted Answer

A) True 
 B)False

Question 5

The strength of a muscle contraction is influenced by the:

Accepted Answer

A)  amount of load. 
B)  initial length of muscle fibers. 
C)  recruitment of motor units. 
D)  All of the above are correct. 
A)  amount of load. 
B)  initial length of muscle fibers. 
C)  recruitment of motor units. 
D)  All of the above are correct.

Question 6

Explain the role of the skeletal muscles in heat production for the body.

Accepted Answer

The skeletal muscles play a crucial role

Question 7

An accumulation of lactic acid in the muscle is the result of an oxygen debt.

Accepted Answer

A) True 
 B)False

Question 8

Match each term with its corresponding description regarding the sliding-filament theory.
-By energizing these structures, chemical energy is converted to mechanical energy

Accepted Answer

A) Troponin 
B) Myosin 
C) Actin 
D) T-tubules 
E) ATP
F)Calcium
G)Cross-bridges
H)Tropomyosin
I)Acetylcholine 
A) Troponin 
B) Myosin 
C) Actin 
D) T-tubules 
E) ATP
F)Calcium
G)Cross-bridges
H)Tropomyosin
I)Acetylcholine

Question 9

Treppe is also called:

Accepted Answer

A)  tetanus. 
B)  electromyography. 
C)  wave summation. 
D)  staircase phenomenon. 
A)  tetanus. 
B)  electromyography. 
C)  wave summation. 
D)  staircase phenomenon.

Question 10

The three phases of muscle contraction are contraction, relaxation, and recovery.

Accepted Answer

A) True 
 B)False

Question 11

A decrease in muscle size is termed:

Accepted Answer

A)  hyperplasia. 
B)  atrophy. 
C)  hypertrophy. 
D)  treppe. 
A)  hyperplasia. 
B)  atrophy. 
C)  hypertrophy. 
D)  treppe.

Question 12

The graded strength principle states that skeletal muscles contract with varying degrees of strength at different times.

Accepted Answer

A) True 
 B)False

Question 13

Explain how the treppe, or staircase, phenomenon applies to pre-exercise warm-up.

Accepted Answer

The treppe phenomenon, also known as the

Question 14

Acetylcholine is the neurotransmitter that stimulates muscle contraction.

Accepted Answer

A) True 
 B)False

Question 15

Which of the following statements about cardiac muscle is incorrect?

Accepted Answer

A)  Cardiac muscle forms an electrically coupled mass called a syncytium. 
B)  Much of the calcium necessary for contraction comes from outside the cell. 
C)  In cardiac muscles, the T-tubules form dyads rather than the triads formed in skeletal muscles. 
D)  All of the above statements are correct. 
A)  Cardiac muscle forms an electrically coupled mass called a syncytium. 
B)  Much of the calcium necessary for contraction comes from outside the cell. 
C)  In cardiac muscles, the T-tubules form dyads rather than the triads formed in skeletal muscles. 
D)  All of the above statements are correct.

Question 16

Anaerobic respiration is the first choice of the muscle cell for the production of ATP.

Accepted Answer

A) True 
 B)False

Question 17

In psychological muscle fatigue, an individual cannot contract his or her muscles.

Accepted Answer

A) True 
 B)False

Question 18

The protein molecule that has heads jutting out for cross-bridging is:

Accepted Answer

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

Question 19

A neuromuscular junction is a type of connection called a synapse.

Accepted Answer

A) True 
 B)False

Question 20

The term striated involuntary muscle refers to cardiac muscle.

Accepted Answer

A) True 
 B)False

Exam 17: Muscle Contraction

The sliding-filament theory is the current model of muscle contraction.

Bundles of fine fibers that extend lengthwise along muscle fibers are called:

Muscles with less than normal muscle tone are called spastic.

Myofibrils make up myofilaments.

The strength of a muscle contraction is influenced by the:

Explain the role of the skeletal muscles in heat production for the body.

An accumulation of lactic acid in the muscle is the result of an oxygen debt.

Match each term with its corresponding description regarding the sliding-filament theory. -By energizing these structures, chemical energy is converted to mechanical energy

Treppe is also called:

The three phases of muscle contraction are contraction, relaxation, and recovery.

A decrease in muscle size is termed:

The graded strength principle states that skeletal muscles contract with varying degrees of strength at different times.

Explain how the treppe, or staircase, phenomenon applies to pre-exercise warm-up.

Acetylcholine is the neurotransmitter that stimulates muscle contraction.

Which of the following statements about cardiac muscle is incorrect?

Anaerobic respiration is the first choice of the muscle cell for the production of ATP.

In psychological muscle fatigue, an individual cannot contract his or her muscles.

The protein molecule that has heads jutting out for cross-bridging is:

A neuromuscular junction is a type of connection called a synapse.

The term striated involuntary muscle refers to cardiac muscle.

Organization of the Body

Homeostasis

Chemical Basis of Life

Biomolecules

Cell Structure

Cell Function

Cell Growth and Development

Introduction to Tissues

Tissue Types

Skin

Skeletal Tissues

Axial Skeleton

Appendicular Skeleton

Articulations

Axial Muscles

Appendicular Muscles

Nervous System Cells

Nerve Signaling

Central Nervous System

Peripheral Nervous System

Autonomic Nervous System

General Senses

Special Senses

Endocrine Regulation

Endocrine Glands

Blood

Heart

Blood Vessels

Circulation of the Blood

Lymphatic System

Innate Immunity

Adaptive Immunity

Stress

Respiratory Tract

Ventilation

Gas Exchange & Transport

Upper Digestive Tract

Lower Digestive Tract

Digestion and Absorption

Nutrition and Metabolism

Urinary System

Fluid and Electrolyte Balance

Acid Base Balance

Male Reproductive System

Female Reproductive System

Growth and Development

Genetics and Heredity

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