4.2 The blood vessels Flashcards
1
Q
What are arteries
A
Carry oxygenated blood away from your heart to the organs of your body
2
Q
Adaptations of arteries
A
- Stretch as blood enters, back to shape after
- Thick elastic walls
- small lumen to withstand pressure
3
Q
What are veins
A
Carry deoxygenated blood from body to heart
4
Q
Adaptations of veins
A
- Large lumen to assit blood flow
- Thin elastic walls
-Valves to prevent backflow
5
Q
What are capillaries
A
Carry nutrients/gases to tissues and remove waste products
6
Q
Adaptations of capillaries
A
- Walls a cell thick to allow nutrients and gases to diffuse through
- Tiny vessel with narrow lumen
7
Q
Adaptations of the pulmonary circulation
A
- Low blood pressure
- Thin walls with little smooth muscle
- Similar pressure
8
Q
Adaptations of Systemic circulation
A
- High blood pressure
- Pressure varies according to distance from heart
- Thicker walls with abundant smooth muscles
