AnswersEAP-Biology B CRThe Cardiovascular System

The Cardiovascular System Answers

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Why do capillaries need to be thin walled?

A
so only a few nutrients can pass through
B
so only a small amount of blood can flow through
C
so they can go through the small spaces within the body
D
so the exchange of gases and nutrients can happen
2
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Frog hearts have a chamber where deoxygenated blood can mix with oxygenated blood. What structure in the human heart prevent such mixing?

A
atria
B
pericardium
C
septum
D
blood vessels
4

Which components make up the cardiovascular system?

A
lungs, heart, and blood vessels
B
heart, blood vessels, and blood
C
heart, blood, and lungs
D
lungs, heart, and skin
5

Which best describes arteries and veins?

A
Both have valves.
B
Both are thick, muscular, and elastic.
C
Arteries carry blood back to the heart; veins connect arteries and capillaries.
D
Arteries carry blood away from the heart; veins carry blood back to the heart.
6

What is the medical term for a heart attack?

A
aneurysm
B
hypertension
C
coronary artery disease
D
myocardial infarction
7

This picture shows what the heart rhythm looks like when there is an injury to the heart muscle due to a lack of blood flow through the coronary arteries.What is most likely true of a person who has this heart rhythm?

Question illustration
A
The person is taking drugs to prevent blood clots.
B
The person has had a heart transplant.
C
The person is having a heart attack.
D
The person has hypertension.
8

Why do arteries need to be thick, muscular, and elastic?

A
to make our bodies strong for movement
B
to withstand the pressure of blood being pumped by the heart
C
to pull the blood back to the heart from all areas of the body
D
to withstand changes in blood temperature
9

What most directly causes hypertension?

A
lack of blood flow to the heart
B
a weakening of a blood vessel wall
C
excessive force of blood pumping
D
injury to heart muscle

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