The structure of arteries, arterioles and veins in relation to their functions Flashcards
Describe the walls of the artery
Thick and muscular walls and elastic tissue
what is the purpose of the elastic tissue
Helps in maintaning high pressure
describe how the endothelium is presented
Folded and thus allows stretching
What do artieries do?
Take out oxygenated blood from heart except pulmonary arteries, which take out deoxygenated blood from heart to the lungs for purification.
What are aterioles
Arteries divide to form smaller vessels known as arterioles
What do aterioles do?
Arterioles form a network throughout the body
What do aterioles do?
According to demand of various parts of the body, arterioles either contract to restrict the blood flow or relax to allow full blood flow.
Describe the lumen of the veins
Wider lumen compared to arteries
Describe the elastic tissue in veins
Very less elastic tissue therefore low pressure
What do valves do?
Stop backflow of blood
What do veins do?
take out deoxygenated blood from body parts
What are the exception of veins
Pulmonary veins which transport oxygenated blood to the heart from the lungs
