AnswersCO-Biology B-CRUnit Test

Muscle Structure and Function Answers

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1
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How do the muscles help in thermoregulation?

A
Muscles produce oil that burns in the presence of oxygen.
B
Muscles undergo a chemical reaction that absorbs heat.
C
Muscles break down carbon dioxide, producing heat.
D
Muscles contract rapidly, producing heat.
2
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Which two structures make up the muscular system?

A
muscles and bones
B
muscles and ligaments
C
muscles and tendons
D
muscles and joints
3

Which of the following correctly differentiates the types of muscles based on the type of movement that they produce?

A
smooth is voluntary; skeletal and cardiac are involuntary
B
skeletal is voluntary; smooth and cardiac are involuntary
C
cardiac is voluntary; skeletal and smooth are involuntary
D
smooth, skeletal, and cardiac are all involuntary
4

The bicep muscle has an attachment point at the shoulder and one in the upper forearm. Look at these images of the bones of the arm. Imagine that the point of the arrow is where the force of the biceps muscle is applied to the bone.Which image would result in the biceps muscle contracting and the forearm being lifted?

Question illustration
A
A
B
B
C
C
D
D
5

Which describes step three of a muscle contraction?

A
The sarcomere lengthens.
B
The space between sarcomeres increases.
C
Actin and myosin are partially overlapped.
D
Actin and myosin are completely overlapped.
6

What is the function of the type of muscle that is pictured below?

Question illustration
A
support and movement of the skeleton
B
movement of food through the digestive system
C
contraction and relaxation of the heart
D
generation and conduction of electrical signals
7

What is the function of the type of muscle that is pictured below?

Question illustration
A
support and movement of the skeleton
B
movement of food through the digestive system
C
contraction and relaxation of the heart
D
generation and conduction of electrical signals
8

Which function of the muscular system is best illustrated by the heart pumping blood throughout the body?

A
hormone regulation
B
support and strength
C
involuntary movement
D
voluntary movement
9

Which best describes the top and bottom images of muscle contraction?

Question illustration
A
The top image is more relaxed than the bottom image.
B
The top image has greater actin-myosin interactions than the bottom image.
C
The bottom image is more relaxed than the top image.
D
The bottom image has fewer overlaps than the top image.
10

What functions does the muscular system perform?

A
It provides stability, movement, and posture.
B
It generates and conducts electrical signals.
C
It produces melanin, which protects from the sun.
D
It produces oil, which protects from foreign invasion.

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