Circulatory System
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functions of the circulatory system
• transport oxygen food and waste to and from cells • help fight infection • transport heat from organs and muscles to the rest of the body
tissue
a group of cells with a similar structure and function
blood
a type of tissue because it is made up of similar cells with a similar function
plasma
straw coloured liquid in which blood cells float , carries nutrients and heat
red blood cells function, structure
carry oxygen to body cells thickened rim, no nucleus
white blood cells function, structure
• fight infection - have a nucleus
platelets function
clot blood when blood vessels are damaged
artery function, wall
thick muscle wall, carry blood Away from the heart
vein function and wall
thin muscle wall, carry blood to the heart
capillary function and wall , and how it joins vessels
one cell thick, allow substances to pass in and out of blood (arteries break up into capillaries, capillaries join together into veins)
vessels of the heart left to right
vena cava (from around the body) pulmonary artery aorta pulmonary vein (oxygenated blood)
the wall in the middle of the heart and function
septum , separates right and left sides of the heart
the two types of chambers, which one is on top?
atrium on top, ventricle on bottom
valve function
stops blood flowing backwards
coronary arteries function
bring nutrients and oxygen to the heart
interaction with other systems
• food absorbed from digestive system • oxygen absorbed from respiratory system • all cells of all system sreceive oxygen and food from blood
how exercise increases heart rate
increase in movement needs increase in energy needs increase in rate of respiration needs increase in amount of glucose and oxygen supplied to cells needs increase in blood supply to cells needs increase in heart rate .