The structure and function of arteries capillaries and veins

Question 1

What’s the function of arteries

Answer 1

carry blood away from the heart

Question 2

What does an artery consist of

Answer 2

an outer layer of connective tissue, smooth muscle and the endothelium lining the central lumen

Question 3

what does the arteries outer layer have

Answer 3

connective tissue containing elastic fibres

Question 4

What does the middle layer fo arteries contain

Answer 4

smooth muscle with more elastic fibres

Question 5

What do the elastci walls of the arteries do

Answer 5

stretch and recoil to accomodate the surge of blood

Question 6

What supplies oxygenated blood to heart muscle

Answer 6

coronary artery

Question 7

what can the smooth muscle in the walls fo arteries do

Answer 7

can contract causing vasoconstriction or relax causing vasodilation to control blood flow

Question 8

What do capillaries consist of

Answer 8

the endothelium lining in the lumen

Question 9

Whats the function of capillaries

Answer 9

allow gass xchange of substances with tissues

Question 10

describe the capillaries walls

Answer 10

very thin to allow efficient exchange of materials

Question 11

Whats the function of veins

Answer 11

carry blood back to the heart

Question 12

What does the outer layer of veins consist of

Answer 12

connective tissue containing elastic fibres

Question 13

What does the middle layer fo veins consist of

Answer 13

smooth muscle with mroe elastic fibres

Question 14

What do veins have

Answer 14

an endothelium lining the central lumen

Question 15

Whats the function of valves

Answer 15

prevent the backflow of blood

Question 16

What pressure does blood in the veins move at

Answer 16

low pressue

Question 17

why is the layer of smooth muscle thinner in veins than in arteries

Answer 17

because blood flows at low pressue

Question 18

Why do capillaries have a very narrow diameter

Answer 18

allows them to run close to every cell of the body

Question 19

What does pressure filtration do

Answer 19

forces plasma to pass through capillary walls into the tissue fluid surrounding the cells

Question 20

tissue fluid and blood plasma are similar in composition with the exception of

Answer 20

plasma proteins which are too large to be filtered through the capillary walls

Question 21

Whats the function fo lymphatic vessels

Answer 21

absorb excess tissue fluid and return it as lympth to the circulatory system

Question 22

What is it knwon as when the fluid is absorbed by lymphatic vessels

Answer 22

Lymph

Question 23

Whats the function of tissue fluid

Answer 23

supplies cells with glucose oxygen and other substances