Unit4- 1.6~ Types, structures and functions of blood vessels

Question 1

What are the types blood vessels?

Answer 1

• Arteries
• Veins
• Capillaries

Question 2

What is the structure of arteries?

Answer 2

• Thick walled, muscular and elastic to withstand high pressure of blood pumepd from the heart
• Have a narrow lumen (central cavity) and a thick wall with three layers
• Innermost: endothelium, middle: muscular layer, outer: connective tissue

Question 3

What is the function of arteries?

Answer 3

To transport oxygenated blood from the heart to various body tissues. The muscular layer wall constricts and dilates to regulate blood flow and pressure

Question 4

What is the structure of veins?

Answer 4

• Have a large lumen and thin walls
• Not exosed to pressure so walls are less thick and elastic
• Veins contain valves to prevent backflow of blood

Question 5

What is the function of veins?

Answer 5

Carry de-oxygenated blood and waste products from body tissue back to the heart, under low pressure. Veins have valves to ensure the one-way movement of blood against gravity

Question 6

What is the structure of capillaries?

Answer 6

• Very thin wall composed of a single layer of epithelial cells
• This feature facilitates rapid exchange of materials between blood and cells

Question 7

What is the function of capillaries?

Answer 7

• Transports oxygens and nutrients to cells
• Supplies tissues
• Removes waste and carbon dioxide