Question 1

Regarding a skeletal muscle fiber, wherever a T-tubule encircles a myofibril, the tubule is tightly bound to

Accepted Answer

A)  the nucleus.
B)  the sarcolemma.
C)  the endomysium.
D)  the sarcoplasmic reticulum.
E)  thick filaments.F) B) and E)
G) A) and B)

Question 2

Active muscles generate

Accepted Answer

A)  heat and oxygen.
B)  blood and sodium.
C)  sodium and oxygen.
D)  oxygen and carbon dioxide.
E)  carbon dioxide and heat.F) A) and C)
G) A) and D)

Question 3

Why do individual muscle twitches have to be added together, as in summation or tetanus?

Accepted Answer

A)  Only added twitches produce any muscle contraction: A fiber undergoing a muscle twitch does not contract at all.
B)  There has to be a critical mass of muscle twitches for calcium to be released into the muscle cell.
C)  Not enough acetylcholine will be produced for contraction without multiple twitches.
D)  Multiple twitches add up to an increase in muscle fiber tension, which increases the strength of the muscle.
E)  Not enough ATP is generated by one muscle twitch.F) A) and D)
G) D) and E)

Question 4

Skeletal muscle fibers differ from "typical cells" in that these muscle fibers

Accepted Answer

A)  lack a plasma membrane.
B)  have many nuclei.
C)  are very small.
D)  lack mitochondria.
E)  contain endoplasmic reticulum.F) A) and C)
G) D) and E)

Question 5

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) A) and C)

Question 6

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) B) and C)
G) All of the above

Question 7

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) A) and B)
G) A) and C)

Question 8

Figure 7-1 Structural Components of a Skeletal Muscle Fiber
Use Figure 7-1 to identify the labeled part.
-Structure C is the

Accepted Answer

A)  myofibril.
B)  Z line.
C)  sarcoplasmic reticulum.
D)  T tubule.
E)  myofilament.F) All of the above
G) A) and B)

Question 9

In response to action potentials arriving from the transverse tubules, the sarcoplasmic reticulum releases

Accepted Answer

A)  acetylcholine.
B)  sodium ions.
C)  potassium ions.
D)  calcium ions.
E)  acetylcholinesterase.F) A) and E)
G) A) and C)

Question 10

Place these steps of muscle contraction in the correct order. 1. Action potential is generated along the sarcolemma
2. Nerve impulse arrives at synapse
3. Calcium is released into muscle cell cytoplasm
4. Acetylcholine is produced
5. Actin and myosin molecules continuously cross-link, with actin molecules being pulled inward

Accepted Answer

A)  2, 3, 4, 1, 5
B)  4, 2, 1, 5, 3
C)  1, 2, 4, 3, 5
D)  2, 4, 1, 3, 5
E)  1, 2, 4, 5, 3F) A) and E)
G) C) and D)

Question 11

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) A) and D)
G) C) and E)

Question 12

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) B) and D)
G) D) and E)

Question 13

The area of the sarcomere that is the light region between two successive A-bands is the

Accepted Answer

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

Question 14

The term used to describe muscular growth in response to usage is

Accepted Answer

A)  multiple sclerosis.
B)  muscular dystrophy.
C)  atrophy.
D)  hypertrophy.
E)  myopathy.F) B) and E)
G) All of the above

Question 15

Muscle cells

Accepted Answer

A)  actively lengthen.
B)  generate compression.
C)  possess a mechanism that regulates the tension amount by changing the number of contracting sarcomeres.
D)  vary tension production based on the amount of sodium ions bound to actin.
E)  can only contract.F) A) and B)
G) A) and C)

Question 16

Which muscle would not move the scapula?

Accepted Answer

A)  rhomboid
B)  erector spinae
C)  serratus anterior
D)  pectoralis minor
E)  trapeziusF) D) and E)
G) B) and C)

Question 17

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)

Question 18

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...

Question 19

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 C)
G) B) and E)

Question 20

Muscles comprising the quadriceps group include the

Accepted Answer

A)  semitendinosus, biceps femoris, rectus femoris, and vastus medialis.
B)  rectus femoris, tibialis anterior, soleus, and adductor longus.
C)  peroneus, gastrocnemius, vastus intermedius, and rectus femoris.
D)  iliopsoas, gracilis, adductor magnus, biceps femoris, and gracilis.
E)  rectus femoris, vastus intermedius, vastus lateralis, and vastus medialis.F) C) and E)
G) B) and C)

Exam 7: The Muscular System

Muscles comprising the quadriceps group include the

Correct Answer
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Which of the following muscles is named for its shape?

Correct Answer
verified

Skeletal muscle fibers differ from "typical cells" in that these muscle fibers

Correct Answer
verified

Which of the following is true about red muscles?

Correct Answer
verified

Why do individual muscle twitches have to be added together, as in summation or tetanus?

Correct Answer
verified

Active muscles generate

Correct Answer
verified

The terminal cisternae are structural features of 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

Which of the following is characteristic of cardiac muscle?

Correct Answer
verified

In response to action potentials arriving from the transverse tubules, the sarcoplasmic reticulum releases

Correct Answer
verified

Correct Answer
verified

The term used to describe muscular growth in response to usage is

Correct Answer
verified

Regarding a skeletal muscle fiber, wherever a T-tubule encircles a myofibril, the tubule is tightly bound to

Correct Answer
verified

Glycolysis

Correct Answer
verified

Figure 7-1 Structural Components of a Skeletal Muscle Fiber Use Figure 7-1 to identify the labeled part. -Structure C is the

Correct Answer
verified

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

Correct Answer
verified

Which muscle would not move the scapula?

Correct Answer
verified

Muscle cells

Correct Answer
verified

The area of the sarcomere that is the light region between two successive A-bands is the

Correct Answer
verified

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

Exam 7: The Muscular System

Muscles comprising the quadriceps group include the

Correct AnswerverifiedShow Answer

Which of the following muscles is named for its shape?

Correct AnswerverifiedShow Answer

Skeletal muscle fibers differ from "typical cells" in that these muscle fibers

Correct AnswerverifiedShow Answer

Which of the following is true about red muscles?

Correct AnswerverifiedShow Answer

Why do individual muscle twitches have to be added together, as in summation or tetanus?

Correct AnswerverifiedShow Answer

Active muscles generate

Correct AnswerverifiedShow Answer

The terminal cisternae are structural features of 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

Which of the following is characteristic of cardiac muscle?

Correct AnswerverifiedShow Answer

In response to action potentials arriving from the transverse tubules, the sarcoplasmic reticulum releases

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The term used to describe muscular growth in response to usage is

Correct AnswerverifiedShow Answer

Regarding a skeletal muscle fiber, wherever a T-tubule encircles a myofibril, the tubule is tightly bound to

Correct AnswerverifiedShow Answer

Glycolysis

Correct AnswerverifiedShow Answer

Figure 7-1 Structural Components of a Skeletal Muscle Fiber Use Figure 7-1 to identify the labeled part. -Structure C is the

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which muscle would not move the scapula?

Correct AnswerverifiedShow Answer

Muscle cells

Correct AnswerverifiedShow Answer

The area of the sarcomere that is the light region between two successive A-bands is the

Correct AnswerverifiedShow Answer

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

Correct Answer
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Correct Answer
verified

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