Body Systems - Vascular

Question 1

function(s)?

Answer 1

• blood vessels circulate essential materials around the body (nutrients, hormones, antibodies, respiratory gases, waste products)
• regulates blood pressure and body temperatures

Question 2

parts?

Answer 2

• heart
• vessels (arteries, veins, capillaries)

Question 3

compare the three types of vessels (function, pressure, diameter, vessel wall, elastic fibres, valves)

Answer 3

• artery: sends blood from the heart; high pressure; narrow lumen; thick wall (3 layers); large amounts; no valves
• vein: sends blood to the heart; low pressure; wide lumen; thin wall (3 layers); small amounts; has valves
• capillaries: material exchange w/the tissues; vv low pressure; extremely narrow lumen; vv thin wall (1 layer); none; no valves

Question 4

explain the structural characteristics of the three vessels and how they relate to their respective functions

Answer 4

• artery: thick walls, narrow lumen -> transport blood at high pressure
• veins: thin walls, wide lumen -> transport blood at low pressure
• capillaries: walls that are a single cell thick -> exchange material between blood and tissue