Question 1

During muscle contraction, ATP supplies energy for

Accepted Answer

A)  creatine phosphate synthesis.
B)  glycogen synthesis.
C)  myofilament movement.
D)  enzyme activity.

Question 2

Knowing the relationship between the main actions of the rectus femoris muscle and the biceps femoris muscle, they can be described as ________.

Accepted Answer

The answer of Knowing the relationship between the main actions...

Question 3

Myofibrils are composed primarily of

Accepted Answer

A)  actin and myosin.
B)  perimysium and endomysium.
C)  troponin and tropomyosin.
D)  fascia and tendons.

Question 4

During strenuous exercise, muscles may not be supplied with enough oxygen, causing a shift in metabolism resulting in the breakdown of pyruvic acid to lactic acid. This change in metabolism is called the

Accepted Answer

A)  aerobic threshold.
B)  lactic acid threshold.
C)  pyruvic acid threshold.
D)  glycogenic threshold.

Question 5

As a person is vigorously rowing a boat, they suddenly experience extreme pain in their upper arm and no longer can extend at the elbow joint. Which of the following is probably the injured muscle?

Accepted Answer

A)  Biceps brachii
B)  Brachioradialis
C)  Triceps brachii
D)  Supinator

Question 6

When a muscle undergoes atrophy in response to disuse

Accepted Answer

A)  motor neurons grow and invade abnormally.
B)  the size of actin and myosin filaments decreases.
C)  capillaries and vessels rupture.
D)  the muscle swells.

Question 7

The functional unit of muscle contraction is

Accepted Answer

A)  the muscle.
B)  the muscle fiber.
C)  the myosin cross-bridge.
D)  the sarcomere.

Question 8

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

Accepted Answer

A) True 
 B)False

Exam 9: Muscular System

Knowing the relationship between the main actions of the rectus femoris muscle and the biceps femoris muscle, they can be described as ________.

Correct Answer
verified

The functional unit of muscle contraction is

Correct Answer
verified

When a muscle undergoes atrophy in response to disuse

Correct Answer
verified

Myofibrils are composed primarily of

Correct Answer
verified

During muscle contraction, ATP supplies energy for

Correct Answer
verified

During strenuous exercise, muscles may not be supplied with enough oxygen, causing a shift in metabolism resulting in the breakdown of pyruvic acid to lactic acid. This change in metabolism is called the

Correct Answer
verified

As a person is vigorously rowing a boat, they suddenly experience extreme pain in their upper arm and no longer can extend at the elbow joint. Which of the following is probably the injured muscle?

Correct Answer
verified

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

Correct Answer
verified

Exam 9: Muscular System

Knowing the relationship between the main actions of the rectus femoris muscle and the biceps femoris muscle, they can be described as ________.

Correct AnswerverifiedShow Answer

The functional unit of muscle contraction is

Correct AnswerverifiedShow Answer

When a muscle undergoes atrophy in response to disuse

Correct AnswerverifiedShow Answer

Myofibrils are composed primarily of

Correct AnswerverifiedShow Answer

During muscle contraction, ATP supplies energy for

Correct AnswerverifiedShow Answer

During strenuous exercise, muscles may not be supplied with enough oxygen, causing a shift in metabolism resulting in the breakdown of pyruvic acid to lactic acid. This change in metabolism is called the

Correct AnswerverifiedShow Answer

As a person is vigorously rowing a boat, they suddenly experience extreme pain in their upper arm and no longer can extend at the elbow joint. Which of the following is probably the injured muscle?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified