bio Flashcards
1
Q
What is the role of arteries?
A
To carry blood away from the heart under high pressure.
2
Q
Describe the structure of arteries.
A
Arteries have a thick muscular wall and a small internal diameter.
3
Q
What is the role of veins?
A
To carry blood back towards the heart under low pressure.
4
Q
Describe the structure of veins.
A
Veins have a thin muscular wall and a wide internal diameter.
Veins also have valves to prevent the back-flow of blood.
5
Q
What is the role of capillaries?
A
To exchange materials between blood and tissues while
connecting arteries and veins together.
6
Q
Describe the structure of capillaries.
A
Very small, thin-walled vessels, making them efficient at
exchanging materials.
