Question 1

The active sites on actin molecules are usually covered up by other molecules. What is the critical material required to uncover the active sites on the actin molecules that will then bind to myosin heads?

Accepted Answer

A)   ATP
B)   calcium
C)   oxygen
D)   vitamin A
E)   titinF) A) and B)
G) B) and C)

Question 2

Figure 7-1 Structural Components of a Skeletal Muscle Fiber
Use Figure 7-1 to identify the labeled part.
-The structures labeled F are the

Accepted Answer

A)   mitochondria.
B)   sarcomeres.
C)   nuclei.
D)   centrioles.
E)   troponin molecules.F) A) and D)
G) A) and C)

Question 3

Which of the following originates from the cartilages of ribs 2-6, the sternal body, and the clavicle?

Accepted Answer

A)   teres minor
B)   supraspinatus
C)   pectoralis major
D)   teres major
E)   subscapularisF) A) and D)
G) A) and C)

Question 4

Myofibrils are made primarily of

Accepted Answer

A)   actin and myosin.
B)   epimysium.
C)   ATP and ADP.
D)   troponin.
E)   tropomyosin.F) A) and D)
G) None of the above A

Question 5

During moderate activity, which of the following is true regarding muscle metabolism?

Accepted Answer

A)   The ATP produced is used to build energy reserves of ATP and glycogen.
B)   Most ATP is produced through glycolysis, with lactate and hydrogen ions as byproducts.
C)   Glucose and fatty acids are catabolized.
D)   Mitochondrial activity provides about one-third of the ATP consumed.
E)   Mitochondria are not involved.F) B) and C)
G) B) and D)

Question 6

Which statement regarding "heat loss" is true?

Accepted Answer

A)   Muscle activity does not generate heat.
B)   Shivering in a cold environment results in higher levels of heat loss.
C)   When skeletal muscles are contracting at peak levels, body temperature drops.
D)   Heat loss is reduced when blood flow to the skin increases.
E)   Muscle contractions play an important role in the maintenance of normal body temperature.F) A) and D)
G) B) and C)

Question 7

Which of the following describes the action of the trapezius?

Accepted Answer

A)   adducts the spine
B)   adducts and flexes the humerus
C)   elevates, adducts, depresses, or rotates the scapula
D)   provides medial rotation of the head
E)   provides lateral rotation of the humerusF) A) and D)
G) None of the above

Question 8

The terminal cisternae are structural features of the

Accepted Answer

A)   myofilaments.
B)   sarcoplasmic reticula.
C)   myofibrils.
D)   I bands.
E)   sarcolemma.F) A) and B)
G) A) and E)

Question 9

Which of the following is true about red muscles?

Accepted Answer

A)   Red muscles are slower than white muscles.
B)   Red muscles have fewer mitochondria than white muscles.
C)   Red muscles have fibers of greater diameter than those of white muscles.
D)   Red muscles contain less myoglobin than white muscles.
E)   Red muscles fatigue quickly.F) A) and B)
G) B) and E) A

Question 10

The region of a sarcomere containing myosin, going from one end of the myosin molecules to the other end of the myosin molecules, is the

Accepted Answer

A)   Z line.
B)   M line.
C)   H band.
D)   A band.
E)   I band.F) B) and E)
G) B) and D)

Question 11

Which of the following acts to flex the elbow?

Accepted Answer

A)   brachioradialis
B)   triceps brachii
C)   pronator quadratus
D)   palmaris longus
E)   supinatorF) A) and B)
G) B) and C)

Question 12

"Anaerobic endurance"

Accepted Answer

A)   is used during long, slow athletic activities.
B)   is exemplified by contractions of fast muscle fibers.
C)   is determined by the availability of carbohydrates, lipids, or amino acids for breakdown.
D)   is the length of time a muscle can continue to contract while supported by mitochondrial activities.
E)   does not promote muscle hypertrophy.F) A) and C)
G) B) and E)

Question 13

Which of the following is an effect of aging on the muscular system?

Accepted Answer

A)   Tolerance for exercise increases.
B)   Skeletal muscles become more elastic.
C)   Skeletal muscle fibers become smaller in diameter.
D)   Muscle fibers contain more myoglobin.
E)   Scar tissue formation does not occur.F) C) and D)
G) B) and E)

Question 14

Calcium ions are released from the sarcoplasmic reticulum during the ________ phase of contraction.

Accepted Answer

A)   latent
B)   contraction
C)   twitch
D)   relaxation
E)   recoveryF) A) and D)
G) C) and E)

Question 15

Which of the following muscles is named for its shape?

Accepted Answer

A)   pectoralis major
B)   biceps brachii
C)   deltoid
D)   erector spinae
E)   tibialis anteriorF) C) and E)
G) B) and C)

Question 16

Which of the following statements describes how muscles help maintain homeostasis?

Accepted Answer

A)   The contractions of skeletal muscles pull on tendons and move elements of the skeleton.
B)   Skeletal muscles are responsible for guarding the openings of the digestive and urinary tracts.
C)   Skeletal muscles are responsible for the pumping action of the heart.
D)   Skeletal muscles support the weight of some internal organs.
E)   Skeletal muscle contractions help maintain body temperature.F) C) and D)
G) B) and C) E

Question 17

Glycolysis

Accepted Answer

A)   is an anaerobic process.
B)   is the breakdown of pyruvate to glucose.
C)   acts as the only source of ATP in muscle tissue.
D)   is only active during rest.
E)   occurs in the nucleus.F) A) and E)
G) B) and D)

Question 18

Which of the following is characteristic of cardiac muscle?

Accepted Answer

A)   Cardiac muscle cells are striated.
B)   Cardiac muscle cells achieve tetany with every contraction.
C)   Cardiac muscle fibers are multinucleated.
D)   Cardiac muscle fibers are faster than skeletal muscles.
E)   Neurons that innervate cardiac muscle tissue are under voluntary control.F) D) and E)
G) A) and D)

Question 19

While unloading the trunk of her car, Amy pulls a muscle. As a result, she has difficulty moving her arm. The attending physician in the emergency room tells her that she injured her latissimus dorsi muscle. Knowing that the latissimus dorsi was a back muscle, Amy doesn't understand what the muscle has to do with her injured arm. Explain the involvement of the muscle in Amy's injury.

Accepted Answer

Although the latissimus dorsi muscle is ...

Question 20

You have a large garden with a variety of fruits, vegetables, and flowers, and you have a problem with insects eating them. You decide to use Malathion, an organophosphate insecticide, but you are not terribly careful about protecting yourself as you are spraying. Worried, you decide to look up the action of Malathion and find that it is an acetylcholinesterase inhibitor. Explain how this chemical affects muscle contraction and include where it has its effect and why.

Accepted Answer

AChE is the enzyme that splits up acetyl...

Exam 7: The Muscular System

The active sites on actin molecules are usually covered up by other molecules. What is the critical material required to uncover the active sites on the actin molecules that will then bind to myosin heads?

Correct Answer
verified

Figure 7-1 Structural Components of a Skeletal Muscle Fiber Use Figure 7-1 to identify the labeled part. -The structures labeled F are the

Correct Answer
verified

Which of the following originates from the cartilages of ribs 2-6, the sternal body, and the clavicle?

Correct Answer
verified

Myofibrils are made primarily of

Correct Answer
verified
A

During moderate activity, which of the following is true regarding muscle metabolism?

Correct Answer
verified

Which statement regarding "heat loss" is true?

Correct Answer
verified

Which of the following describes the action of the trapezius?

Correct Answer
verified

The terminal cisternae are structural features of the

Correct Answer
verified

Which of the following is true about red muscles?

Correct Answer
verified
A

The region of a sarcomere containing myosin, going from one end of the myosin molecules to the other end of the myosin molecules, is the

Correct Answer
verified

Which of the following acts to flex the elbow?

Correct Answer
verified

"Anaerobic endurance"

Correct Answer
verified

Which of the following is an effect of aging on the muscular system?

Correct Answer
verified

Calcium ions are released from the sarcoplasmic reticulum during the ________ phase of contraction.

Correct Answer
verified

Which of the following muscles is named for its shape?

Correct Answer
verified

Which of the following statements describes how muscles help maintain homeostasis?

Correct Answer
verified
E

Glycolysis

Correct Answer
verified

Which of the following is characteristic of cardiac muscle?

Correct Answer
verified

Correct Answer
verified
Although the latissimus dorsi muscle is ...
View Answer

Correct Answer
verified
AChE is the enzyme that splits up acetyl...
View Answer

Exam 7: The Muscular System

The active sites on actin molecules are usually covered up by other molecules. What is the critical material required to uncover the active sites on the actin molecules that will then bind to myosin heads?

Correct AnswerverifiedShow Answer

Figure 7-1 Structural Components of a Skeletal Muscle Fiber Use Figure 7-1 to identify the labeled part. -The structures labeled F are the

Correct AnswerverifiedShow Answer

Which of the following originates from the cartilages of ribs 2-6, the sternal body, and the clavicle?

Correct AnswerverifiedShow Answer

Myofibrils are made primarily of

Correct AnswerverifiedA

During moderate activity, which of the following is true regarding muscle metabolism?

Correct AnswerverifiedShow Answer

Which statement regarding "heat loss" is true?

Correct AnswerverifiedShow Answer

Which of the following describes the action of the trapezius?

Correct AnswerverifiedShow Answer

The terminal cisternae are structural features of the

Correct AnswerverifiedShow Answer

Which of the following is true about red muscles?

Correct AnswerverifiedA

The region of a sarcomere containing myosin, going from one end of the myosin molecules to the other end of the myosin molecules, is the

Correct AnswerverifiedShow Answer

Which of the following acts to flex the elbow?

Correct AnswerverifiedShow Answer

"Anaerobic endurance"

Correct AnswerverifiedShow Answer

Which of the following is an effect of aging on the muscular system?

Correct AnswerverifiedShow Answer

Calcium ions are released from the sarcoplasmic reticulum during the ________ phase of contraction.

Correct AnswerverifiedShow Answer

Which of the following muscles is named for its shape?

Correct AnswerverifiedShow Answer

Which of the following statements describes how muscles help maintain homeostasis?

Correct AnswerverifiedE

Glycolysis

Correct AnswerverifiedShow Answer

Which of the following is characteristic of cardiac muscle?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedAlthough the latissimus dorsi muscle is ...View AnswerShow Answer

Correct AnswerverifiedAChE is the enzyme that splits up acetyl...View AnswerShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
A

Correct Answer
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Correct Answer
verified

Correct Answer
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Correct Answer
verified

Correct Answer
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A

Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
E

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Although the latissimus dorsi muscle is ...
View Answer

Correct Answer
verified
AChE is the enzyme that splits up acetyl...
View Answer