the circulatory system Flashcards
1
Q
Why is the heart described as a double pump?
A
The right part of the heart pumps blood to the lungs and the left hand side pumps blood to the body.
2
Q
What are the three main types of blood vessels?
A
Capillaries, arteries and veins.
3
Q
What do arteries do?
A
Arteries carry blood away from the heart.
4
Q
What do veins do?
A
Veins carry blood to the heart.
5
Q
What do capillaries do?
A
They exchange substances with cells.
6
Q
Why do arteries have a small lumen?
A
So they can withstand the pressure coming from the heart.
7
Q
Why do veins have big lumens?
A
To help the blood flow easily.
8
Q
Why do capillaries have thin walls?
A
To allow glucose and oxygen to pass through.
