Question 1

Refer to the figure showing molecules found in sarcomeres.   Which statement about the structures shown in the figure is true?

Accepted Answer

A)  Structure 1 has ATPase activity. 
B)  Structure 2 blocks myosin-binding sites. 
C)  Structure 3 has one subunit that binds myosin. 
D)  Structure 4 shortens in length as the sarcomere contracts. 
E)  Structure 5 binds calcium. 
A)  Structure 1 has ATPase activity. 
B)  Structure 2 blocks myosin-binding sites. 
C)  Structure 3 has one subunit that binds myosin. 
D)  Structure 4 shortens in length as the sarcomere contracts. 
E)  Structure 5 binds calcium.

Question 2

The strength or weakness of a skeletal muscle contraction depends on

Accepted Answer

A)  only the number of motor units activated. 
B)  only the frequency with which motor units fire. 
C)  only the number of muscle fibers stimulated. 
D)  only the number of motor units activated and the frequency with which motor units fire. 
E)  the number of motor units activated, the frequency with which motor units fire, and the number of muscle fibers stimulated. 
A)  only the number of motor units activated. 
B)  only the frequency with which motor units fire. 
C)  only the number of muscle fibers stimulated. 
D)  only the number of motor units activated and the frequency with which motor units fire. 
E)  the number of motor units activated, the frequency with which motor units fire, and the number of muscle fibers stimulated.

Question 3

Creatine phosphate in muscle cells

Accepted Answer

A)  is part of the glycolytic system for supplying ATP. 
B)  can release its energy when needed to convert ADP to ATP. 
C)  is exhausted as a source of ATP after about five minutes of activity. 
D)  supplies energy once the oxidative system runs out. 
E)  supplies energy once the glycolytic system runs out. 
A)  is part of the glycolytic system for supplying ATP. 
B)  can release its energy when needed to convert ADP to ATP. 
C)  is exhausted as a source of ATP after about five minutes of activity. 
D)  supplies energy once the oxidative system runs out. 
E)  supplies energy once the glycolytic system runs out.

Question 4

Refer to the figure showing the components of a sarcomere.   Which statement about the structures shown in the figure is true?

Accepted Answer

A)  Structure 1 consists of three chains made of monomers. 
B)  Structure 1 shortens in length as contraction occurs. 
C)  Structure 2 includes "heads" that hydrolyze ATP. 
D)  Structure 3 increases in length as contraction occurs. 
E)  Structure 4 increases in length as contraction occurs. 
A)  Structure 1 consists of three chains made of monomers. 
B)  Structure 1 shortens in length as contraction occurs. 
C)  Structure 2 includes "heads" that hydrolyze ATP. 
D)  Structure 3 increases in length as contraction occurs. 
E)  Structure 4 increases in length as contraction occurs.

Question 5

Refer to the graph showing the capacity of three systems that provide ATP for muscle contraction.   Based on the graph, which statement is true?

Accepted Answer

A)  The system of curve A metabolizes carbohydrates to pyruvate and lactate. 
B)  The system of curve B comes on line within seconds but lacks sustained efficiency. 
C)  The system of curve B uses ATP produced by oxidative metabolism. 
D)  The system of curve C uses preformed ATP and creatine phosphate. 
E)  The system of curve C enables fast-twitch fibers to generate force quickly. 
A)  The system of curve A metabolizes carbohydrates to pyruvate and lactate. 
B)  The system of curve B comes on line within seconds but lacks sustained efficiency. 
C)  The system of curve B uses ATP produced by oxidative metabolism. 
D)  The system of curve C uses preformed ATP and creatine phosphate. 
E)  The system of curve C enables fast-twitch fibers to generate force quickly.

Question 6

Satellite cells are characterized in part by their ability to

Accepted Answer

A)  communicate a muscle fiber's need for more O2. 
B)  lie in a ring around the muscle fibers, absorbing their metabolic waste. 
C)  produce new muscle fibers. 
D)  move through the fibers, providing ATP where it is most needed. 
E)  phagocytize, watching for and then attacking pathogens in the muscle fiber. 
A)  communicate a muscle fiber's need for more O2. 
B)  lie in a ring around the muscle fibers, absorbing their metabolic waste. 
C)  produce new muscle fibers. 
D)  move through the fibers, providing ATP where it is most needed. 
E)  phagocytize, watching for and then attacking pathogens in the muscle fiber.

Question 7

Which bone articulates with the pelvis?

Accepted Answer

A)  Femur 
B)  Humerus 
C)  Fibula 
D)  Ulna 
E)  Clavicle 
A)  Femur 
B)  Humerus 
C)  Fibula 
D)  Ulna 
E)  Clavicle

Question 8

The total energy supply in all the muscles of the human body (in the form of ATP and creatine phosphate) is about 10 kilocalories.When a human is sitting at rest, how long does it take the body to metabolize this amount of energy?

Accepted Answer

A)  1 second 
B)  30 seconds 
C)  3 minutes 
D)  10 minutes 
E)  30 minutes 
A)  1 second 
B)  30 seconds 
C)  3 minutes 
D)  10 minutes 
E)  30 minutes

Question 9

A patient with a family history of osteoporosis is advised by her physician to engage in weight-bearing exercise.What is osteoporosis, and how might such exercise help to prevent it?

Accepted Answer

Osteoporosis is a decrease in bone densi

Question 10

Which muscle type(s) contain(s) intercalated disks?

Accepted Answer

A)  Smooth muscle only 
B)  Cardiac muscle only 
C)  Skeletal muscle only 
D)  Both smooth and cardiac muscle, but not skeletal muscle 
E)  Smooth, cardiac, and skeletal muscle 
A)  Smooth muscle only 
B)  Cardiac muscle only 
C)  Skeletal muscle only 
D)  Both smooth and cardiac muscle, but not skeletal muscle 
E)  Smooth, cardiac, and skeletal muscle

Question 11

Fast-twitch skeletal muscle fibers, called white muscle, are characterized by

Accepted Answer

A)  a high concentration of myoglobin. 
B)  abundant mitochondria. 
C)  the rapid development of high tension. 
D)  the ability to sustain activity for a long time. 
E)  a higher oxygen requirement than that of slow-twitch fibers. 
A)  a high concentration of myoglobin. 
B)  abundant mitochondria. 
C)  the rapid development of high tension. 
D)  the ability to sustain activity for a long time. 
E)  a higher oxygen requirement than that of slow-twitch fibers.

Question 12

Because the heartbeat is generated by the heart muscle itself, it is said to be _______.

Accepted Answer

The answer of Because the heartbeat is generated by the...

Question 13

The skeletal muscles in the legs of competitive cross-country skiers and long-distance runners are likely to have

Accepted Answer

A)  all slow-twitch fibers. 
B)  all fast-twitch fibers. 
C)  about the same number of slow-twitch and fast-twitch fibers. 
D)  more fast-twitch fibers. 
E)  more slow-twitch fibers. 
A)  all slow-twitch fibers. 
B)  all fast-twitch fibers. 
C)  about the same number of slow-twitch and fast-twitch fibers. 
D)  more fast-twitch fibers. 
E)  more slow-twitch fibers.

Question 14

Curare is a plant poison from South America that is applied to the tips of arrows.Curare acts by preventing acetylcholine from binding to its receptors.Mammals hit by these darts die by asphyxiation.How does the poison cause the victim to stop breathing?

Accepted Answer

Motor neurons normally release acetylcho

Question 15

Choose the correct sequence in which skeletal muscle cells rely on the listed sources of ATP.

Accepted Answer

A)  Preformed ATP and creatine phosphate; glycolysis; oxidative metabolism 
B)  Oxidative metabolism; preformed ATP and creatine phosphate; glycolysis 
C)  Glycolysis; preformed ATP and creatine phosphate; oxidative metabolism 
D)  Preformed ATP and creatine phosphate; oxidative metabolism; glycolysis 
E)  Glycolysis; oxidative metabolism; preformed ATP and creatine phosphate 
A)  Preformed ATP and creatine phosphate; glycolysis; oxidative metabolism 
B)  Oxidative metabolism; preformed ATP and creatine phosphate; glycolysis 
C)  Glycolysis; preformed ATP and creatine phosphate; oxidative metabolism 
D)  Preformed ATP and creatine phosphate; oxidative metabolism; glycolysis 
E)  Glycolysis; oxidative metabolism; preformed ATP and creatine phosphate

Question 16

If you are training for a marathon by running long distances on a frequent basis, the _______ capacity of intermediate fibers in your leg muscles will increase.

Accepted Answer

The answer of If you are training for a marathon...

Question 17

The two types of cells responsible for the remodeling of bone structure are the _______.

Accepted Answer

osteoblast

Question 18

Refer to the figure showing a sarcomere when it is relaxed.   When the muscle contracts, _______ will become more narrow in the sarcomere.

Accepted Answer

A)  only the A band 
B)  only the I band 
C)  only the H zone 
D)  only actin 
E)  both the I band and the H zone 
A)  only the A band 
B)  only the I band 
C)  only the H zone 
D)  only actin 
E)  both the I band and the H zone

Question 19

Which muscle type(s) has/have the least regular arrangements of actin and myosin?

Accepted Answer

A)  Smooth muscle only 
B)  Cardiac muscle only 
C)  Skeletal muscle only 
D)  Both smooth and cardiac muscle, but not skeletal muscle 
E)  Smooth, cardiac, and skeletal muscle 
A)  Smooth muscle only 
B)  Cardiac muscle only 
C)  Skeletal muscle only 
D)  Both smooth and cardiac muscle, but not skeletal muscle 
E)  Smooth, cardiac, and skeletal muscle

Question 20

Which structure is part of the appendicular skeleton?

Accepted Answer

A)  Vertebral column 
B)  Humerus 
C)  Sternum 
D)  Skull 
E)  Ribs 
A)  Vertebral column 
B)  Humerus 
C)  Sternum 
D)  Skull 
E)  Ribs

Exam 47: Musculoskeletal Systems

Refer to the figure showing molecules found in sarcomeres. Which statement about the structures shown in the figure is true?

The strength or weakness of a skeletal muscle contraction depends on

Creatine phosphate in muscle cells

Refer to the figure showing the components of a sarcomere. Which statement about the structures shown in the figure is true?

Refer to the graph showing the capacity of three systems that provide ATP for muscle contraction. Based on the graph, which statement is true?

Satellite cells are characterized in part by their ability to

Which bone articulates with the pelvis?

The total energy supply in all the muscles of the human body (in the form of ATP and creatine phosphate) is about 10 kilocalories.When a human is sitting at rest, how long does it take the body to metabolize this amount of energy?

A patient with a family history of osteoporosis is advised by her physician to engage in weight-bearing exercise.What is osteoporosis, and how might such exercise help to prevent it?

Which muscle type(s) contain(s) intercalated disks?

Fast-twitch skeletal muscle fibers, called white muscle, are characterized by

Because the heartbeat is generated by the heart muscle itself, it is said to be _______.

The skeletal muscles in the legs of competitive cross-country skiers and long-distance runners are likely to have

Curare is a plant poison from South America that is applied to the tips of arrows.Curare acts by preventing acetylcholine from binding to its receptors.Mammals hit by these darts die by asphyxiation.How does the poison cause the victim to stop breathing?

Choose the correct sequence in which skeletal muscle cells rely on the listed sources of ATP.

If you are training for a marathon by running long distances on a frequent basis, the _______ capacity of intermediate fibers in your leg muscles will increase.

The two types of cells responsible for the remodeling of bone structure are the _______.

Refer to the figure showing a sarcomere when it is relaxed. When the muscle contracts, _______ will become more narrow in the sarcomere.

Which muscle type(s) has/have the least regular arrangements of actin and myosin?

Which structure is part of the appendicular skeleton?

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