circulatory system

Question 1

function

Answer 1

• transport nutrients, oxygen, wastes and hormones within blood throughout the body
• the heart is central to pumping blood throughout the body through blood vessels called arteries, veins and capillaries

Question 2

types of blood vessels

Answer 2

arteries and veins

Question 3

arteries

Answer 3

blood vessels that carry blood away from the heart

Question 4

veins

Answer 4

blood vessels that bring blood back to the heart

Question 5

arteries characteristics

Answer 5

thick walls, high pressure, elastic (stretches, returns to original shape), lots of muscle in walls, no valves

Question 6

veins characteristics

Answer 6

thin walls, low pressure, inelastic (stiff), less muscle in walls, contains valves to prevent backflow of blood

Question 7

capillaries

Answer 7

smallest blood vessels; only one cell thick in order to allow diffusion of substances between blood and body tissue (involved with gas exchange)

Question 8

red blood cells

Answer 8

carry oxygen using hemoglobin

Question 9

white blood cells

Answer 9

body immunity, fights invaders

Question 10

platelets

Answer 10

blood clotting

Question 11

plasma (55%)

Answer 11

carries some dissolved gases, proteins and other blood components

Question 12

function of the heart

Answer 12

pumps blood
right side - pumps oxygen-poor blood to lungs to pick up oxygen
les side - pumps oxygen-rich blood to the body

Question 13

location of the heart

Answer 13

• chest cavity
• in between the lungs
• located slightly to the left