Question 1

Muscles used for activities that require fine motor control, such as holding and writing with a pencil, have

Accepted Answer

A)   motor units consisting of many muscle cells.
B)   motor units consisting of only a few muscle cells.
C)   access to large amounts of ATP.
D)   many neuromuscular junctions.

Question 2

What would happen to a person who was poisoned with a chemical that blocks the production of neurotransmitters at neuromuscular junctions?

Accepted Answer

A)   The muscles would swell.
B)   The sarcoplasmic reticulum would release sodium ions instead of calcium ions.
C)   The muscles would be unable to contract.
D)   The person's muscles would contract uncontrollably.

Question 3

What two types of contractions do smooth muscles perform?

Accepted Answer

slow, sustained cont...

Question 4

Skeletal muscle

Accepted Answer

A)   contracts the large blood vessels.
B)   moves the body.
C)   expands the large blood vessels.
D)   propels food through the digestive tract.
E)   is the muscle tissue of the heart.

Question 5

In a muscle that is resistant to fatigue, such as that of a marathon runner, you would expect

Accepted Answer

A)   a nonstriated appearance.
B)   elevated levels of ATP.
C)   a limited (or decreased)  blood supply.
D)   very few mitochondria.

Question 6

Cnidarians have what type of skeleton?

Accepted Answer

A)   Exoskeleton
B)   Hydrostatic skeleton
C)   They don't have a skeleton
D)   Endoskeleton

Question 7

Where are the largest motor units in human muscles located?

Accepted Answer

A)   Leg muscles
B)   Arm muscles
C)   Muscles of the face
D)   Muscles in the hand

Question 8

Many people hope that they will one day be able to travel into space for extended periods of time. What are the health risks to the bones and muscles of those people interested in such "space vacations"?

Accepted Answer

Under weightless conditions, space trave...

Question 9

Which of these muscle components is the smallest?

Accepted Answer

A)   Myosin filament
B)   Myofibril
C)   Skeletal muscle
D)   Muscle fiber

Question 10

Describe the functions of the three types of bone cells.

Accepted Answer

Osteoclasts tunnel through (or dissolve)...

Question 11

Action potentials stimulate the sarcoplasmic reticulum to release chloride ions into the muscle cell.

Accepted Answer

A) True 
 B)False

Question 12

At a joint, the end of a skeletal muscle that is attached to the bone that moves is known as the origin.

Accepted Answer

A) True 
 B)False

Question 13

Which of these animals is correctly matched with its type of skeleton?

Accepted Answer

A)   Mayfly/hydroskeleton
B)   Bird/exoskeleton
C)   Shark/hydroskeleton
D)   Lobster/exoskeleton
E)   Earthworm/endoskeleton

Question 14

After falling down a flight of stairs, it feels like you broke your ankle; however the emergency room doctor says you tore a ligament. This means you tore the

Accepted Answer

A)   insertion of a muscle.
B)   the cartilage in your ankle joint.
C)   connective tissue band that joins two bones.
D)   delicate membrane that covers the surface of the bone.
E)   connective tissue band that attaches muscle to bone.

Question 15

During embryonic development, the skeleton is initially made of _ , which is later replaced by bone.

Accepted Answer

The answer of During embryonic development, the skeleton is initially...

Question 16

The site of communication between a neuron and a muscle fiber is called a

Accepted Answer

A)   myofibril.
B)   Z disc.
C)   sarcomere.
D)   neuromuscular junction.

Question 17

A joint that is movable in only two dimensions, such as the elbow, is called a joint.

Accepted Answer

The answer of A joint that is movable in only...

Question 18

Earthworms and slugs move by

Accepted Answer

A)   contracting their cilia.
B)   alternating contractions of longitudinal and circular muscles.
C)   contracting extensor and flexor muscles attached to their endoskeleton.
D)   stretching their longitudinal muscles and contracting their circular muscles.

Question 19

The end of a skeletal muscle that is attached to a stationary, fixed bone is the origin. The end of a skeletal muscle that is attached to a movable bone is called the

Accepted Answer

A)   insertion.
B)   hinge.
C)   flexor.
D)   extensor.
E)   joint.

Question 20

Motor units are all of the sarcomeres that make up a muscle fiber.

Accepted Answer

A) True 
 B)False

Exam 41: Action and Support: the Muscles and Skeleton

Action potentials stimulate the sarcoplasmic reticulum to release chloride ions into the muscle cell.

Correct AnswerverifiedShow Answer

A joint that is movable in only two dimensions, such as the elbow, is called a joint.

Correct AnswerverifiedShow Answer

Which of these animals is correctly matched with its type of skeleton?

Correct AnswerverifiedShow Answer

Many people hope that they will one day be able to travel into space for extended periods of time. What are the health risks to the bones and muscles of those people interested in such "space vacations"?

Correct AnswerverifiedUnder weightless conditions, space trave...View AnswerShow Answer

What would happen to a person who was poisoned with a chemical that blocks the production of neurotransmitters at neuromuscular junctions?

Correct AnswerverifiedShow Answer

Which of these muscle components is the smallest?

Correct AnswerverifiedShow Answer

The site of communication between a neuron and a muscle fiber is called a

Correct AnswerverifiedShow Answer

After falling down a flight of stairs, it feels like you broke your ankle; however the emergency room doctor says you tore a ligament. This means you tore the

Correct AnswerverifiedShow Answer

Where are the largest motor units in human muscles located?

Correct AnswerverifiedShow Answer

Cnidarians have what type of skeleton?

Correct AnswerverifiedShow Answer

In a muscle that is resistant to fatigue, such as that of a marathon runner, you would expect

Correct AnswerverifiedShow Answer

Motor units are all of the sarcomeres that make up a muscle fiber.

Correct AnswerverifiedShow Answer

The end of a skeletal muscle that is attached to a stationary, fixed bone is the origin. The end of a skeletal muscle that is attached to a movable bone is called the

Correct AnswerverifiedShow Answer

Describe the functions of the three types of bone cells.

Correct AnswerverifiedOsteoclasts tunnel through (or dissolve)...View AnswerShow Answer

Earthworms and slugs move by

Correct AnswerverifiedShow Answer

What two types of contractions do smooth muscles perform?

Correct Answerverifiedslow, sustained cont...View AnswerShow Answer

Muscles used for activities that require fine motor control, such as holding and writing with a pencil, have

Correct AnswerverifiedShow Answer

At a joint, the end of a skeletal muscle that is attached to the bone that moves is known as the origin.

Correct AnswerverifiedShow Answer

Skeletal muscle

Correct AnswerverifiedShow Answer

During embryonic development, the skeleton is initially made of _ , which is later replaced by bone.

Correct AnswerverifiedShow Answer

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Under weightless conditions, space trave...
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Osteoclasts tunnel through (or dissolve)...
View Answer

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slow, sustained cont...
View Answer

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Correct Answer
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