Question 1

In the sarcomere which elastic protein attaches the thick filament to the Z line?

Accepted Answer

A)  titin 
B)  actin 
C)  G actin 
D)  nebulin 
E)  myosin

Question 2

During anaerobic glycolysis,

Accepted Answer

A)  ATP is produced. 
B)  pyruvic acid is produced. 
C)  oxygen is not consumed. 
D)  carbohydrate is metabolized. 
E)  All of the answers are correct.

Question 3

When calcium ion binds to troponin,

Accepted Answer

A)  tropomyosin rolls away from the active site. 
B)  active sites on the myosin are exposed. 
C)  actin heads will bind to myosin. 
D)  muscle relaxation occurs. 
E)  myosin shortens.

Question 4

Each skeletal muscle fiber is controlled by a motor neuron at a single

Accepted Answer

A)  synaptic knob. 
B)  sarcomere. 
C)  neuromuscular junction. 
D)  synaptic cleft. 
E)  transverse tubule.

Question 5

Figure 10-1 Skeletal Muscle Fiber
 
Use Figure 10-1 to answer the following questions:
-Identify the structure where ATP is produced.

Accepted Answer

A)  6 
B)  7 
C)  1 
D)  3 
E)  2

Question 6

Creatine phosphate

Accepted Answer

A)  is produced by the process of anaerobic respiration. 
B)  can replace ATP in binding to myosin molecules during contraction. 
C)  acts as an energy reserve in muscle tissue. 
D)  is only formed during strenuous exercise. 
E)  cannot transfer its phosphate group to ADP.

Question 7

Which of the following is not characteristic of smooth muscle?

Accepted Answer

A)  The striations are due to the orderly arrangement of actin and myosin. 
B)  Neurons that innervate smooth muscles are under involuntary control. 
C)  Smooth muscle cells are uninucleate. 
D)  Smooth muscles do not contain sarcomeres. 
E)  The thin filaments of smooth muscle fibers are attached to dense bodies.

Question 8

Figure 10-2 Muscle Contractions
 
Use Figure 10-2 to answer the following questions:
-What is the contraction in graph (d) called?

Accepted Answer

A)  complete tetanus 
B)  incomplete tetanus 
C)  twitch 
D)  wave summation 
E)  treppe

Question 9

The dense layer of connective tissue that surrounds an entire skeletal muscle is the

Accepted Answer

A)  tendon. 
B)  epimysium. 
C)  endomysium. 
D)  perimysium. 
E)  fascicle.

Question 10

At each end of the muscle, the collagen fibers of the epimysium, perimysium, and endomysium, come together to form a

Accepted Answer

A)  tendon. 
B)  satellite cell. 
C)  ligament. 
D)  tenosynovium. 
E)  sheath.

Question 11

The increase in muscle tension that is produced by increasing the number of active motor units is called

Accepted Answer

A)  incomplete tetanus. 
B)  complete tetanus. 
C)  treppe. 
D)  wave summation. 
E)  recruitment.

Question 12

The role of acetylcholinesterase is to

Accepted Answer

A)  bind to ligand gated sodium channels. 
B)  activate acetylcholine. 
C)  release acetylcholine into the synaptic cleft. 
D)  transport acetylcholine across the synaptic cleft. 
E)  break down acetylcholine into acetate and choline components.

Question 13

The protein that is found in the Z line of a sarcomere is called

Accepted Answer

A)  actinin. 
B)  titin. 
C)  nebulin. 
D)  myosin. 
E)  actin.

Question 14

________ can be described as a broad tendinous sheet.

Accepted Answer

A)  fasciae 
B)  retinaculum 
C)  aponeurosis 
D)  interstitium 
E)  tympanum

Question 15

Figure 10-1 Skeletal Muscle Fiber
 
Use Figure 10-1 to answer the following questions:
-What physiological process occurs in the structure labeled "7"?

Accepted Answer

A)  release of neurotransmitter 
B)  conduction of the action potential into the cell interior 
C)  activity of acetylcholinesterase 
D)  release of protein and calcium ions into the muscle fiber 
E)  opening of sodium channels and subsequent influx of sodium

Question 16

Since each myofibril is attached at either end of the muscle fiber, when sarcomeres shorten, the musclefiber

Accepted Answer

A)  lengthens. 
B)  shortens. 
C)  strengthens. 
D)  weakens. 
E)  pulls from the middle.

Question 17

Figure 10-2 Muscle Contractions
 
Use Figure 10-2 to answer the following questions:
-What is the contraction in graph (a) called?

Accepted Answer

A)  complete tetanus 
B)  incomplete tetanus 
C)  twitch 
D)  wave summation 
E)  treppe

Question 18

Figure 10-2 Muscle Contractions
 
Use Figure 10-2 to answer the following questions:
-Why is there partial relaxation in graph (c)?

Accepted Answer

A)  Calcium ion release is slow. 
B)  The muscle is starting to fatigue. 
C)  Stimulation intensity is fluctuating. 
D)  ATP reserves are cycling. 
E)  Nerve stimulation frequency is below maximum.

Question 19

Put the following events of excitation-contraction coupling in the order in which they occur.
1) Excitation
2) Sarcomere shortening
3) Generation of muscle tension
4) Neural control
5) Contraction cycle begins
6) Release of calcium ions

Accepted Answer

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

Question 20

In-Text Figure Based Questions
-What happens to sarcomere length if the zone of overlap is decreased? (Figure 10-14)

Accepted Answer

A)  sarcomere length decreases 
B)  sarcomere length stays the same 
C)  sarcomere length increases

Exam 10: Muscle Tissue

In the sarcomere which elastic protein attaches the thick filament to the Z line?

During anaerobic glycolysis,

When calcium ion binds to troponin,

Each skeletal muscle fiber is controlled by a motor neuron at a single

Figure 10-1 Skeletal Muscle Fiber Use Figure 10-1 to answer the following questions: -Identify the structure where ATP is produced.

Creatine phosphate

Which of the following is not characteristic of smooth muscle?

Figure 10-2 Muscle Contractions Use Figure 10-2 to answer the following questions: -What is the contraction in graph (d) called?

The dense layer of connective tissue that surrounds an entire skeletal muscle is the

At each end of the muscle, the collagen fibers of the epimysium, perimysium, and endomysium, come together to form a

The increase in muscle tension that is produced by increasing the number of active motor units is called

The role of acetylcholinesterase is to

The protein that is found in the Z line of a sarcomere is called

________ can be described as a broad tendinous sheet.

Figure 10-1 Skeletal Muscle Fiber Use Figure 10-1 to answer the following questions: -What physiological process occurs in the structure labeled "7"?

Since each myofibril is attached at either end of the muscle fiber, when sarcomeres shorten, the musclefiber

Figure 10-2 Muscle Contractions Use Figure 10-2 to answer the following questions: -What is the contraction in graph (a) called?

Figure 10-2 Muscle Contractions Use Figure 10-2 to answer the following questions: -Why is there partial relaxation in graph (c) ?

Put the following events of excitation-contraction coupling in the order in which they occur. 1) Excitation 2) Sarcomere shortening 3) Generation of muscle tension 4) Neural control 5) Contraction cycle begins 6) Release of calcium ions

In-Text Figure Based Questions -What happens to sarcomere length if the zone of overlap is decreased? (Figure 10-14)