Veins and Venules
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Cardiovascular
- Cardiovascular Overview
- CO2 Transport
- Heart
- Cardiac Impulse
- Blood Pressure
- Arteries and Arterioles
- Veins and Venules
- Capillaries
- Circulation
- Blood
- Hemoglobin
- Blood Clotting
- Topic Anchor: Veins & Venules
- Blood vessels taking blood towards the heart
- Structure:
- Less smooth muscle around veins
- Large lumen, thinner walls
- Inside lined with endothelial cells
- Venules are small branches of veins leading from capillaries
- Less smooth muscle around veins
- Low pressure
- Contain one-way valves to prevent backflow of blood
- High volume
- Can stretch to hold far greater volume of blood