B7.2 transport in mammals

Circulatory system

system of blood vessels and pumps and valves

advantages of double circulation

raises the pressure

supplies cells with oxygen and glucose

arteries

high-pressure blood

veins

low-pressure blood

Capillaries

connect arteries to veins

coronary heart disease

When plaque (cholesterol + WBC) builds up in an arteri

CHD - prevention

quit smoking

reduce animal fatts

exercise regularly

veins - adaptations

thin layer of muscle and elastic fibers

semi lunar valves

arteries - adaptations

thick layer of muscle and elastic fibers

capillaries - adaptations

no muscle and elastic fibers

walls one cell thick

components of blood

RBC

WBC

platelets

plasma

red blood cells - purpose

haemoglobin - carries oxygen and carbon dioxide

white blood cells - purpose

phagocytosis - produce antibodies

platelets - purpose

helps the blood clot

plasma - purpose

carries nutrients