Blood Vessels Flashcards
1
Q
What do arteries branch into?
A
Arterioles
2
Q
What do arterioles do?
A
Contract to restrict blood flow & relax to increase blood flow, allowing blood to be directed to different areas according to demand
3
Q
What do arterioles branch into?
A
Capillaries
4
Q
What do capillaries form?
A
Networks in tissues called capillary beds
5
Q
What is a closed circulatory system?
A
Where blood is confined to blood vessels only
6
Q
What are 3 features of capillaries?
A
Close to cells - short diffusion distance
Walls are one cell thick- short diffusion distance
Large number of capillaries - increase surface area
