Circulatory System Flashcards
functions of Circulatory system
circulate blood to body
transport NOW to cells in blood
transport carbon dioxide/waste away from cells
maintain blood temp
white blood cells fight infection
Vasodilate
Vasoconstrict
Vasodilate, open arteries and more blood move to active muscles
Vasoconstrict, close arteries and less blood move to inactive muscles
Hypothermia
Hyperthermia
Hypothermia, blood vessels vasoconstrict to decrease blood flow and keep heat in
Hyperthermia, blood vessels vasodilate so more blood flow to skin and cool down
The heart
muscular pump which contracts continuously to drive blood around body
Systemic Circulation
Pulmonary Circulation
Systemic, blood from heart to whole body and back
Pulmonary, blood from heart to lungs and back
Right A + V
Left A + V
RIGHT = deoxygenated blood
LEFT = oxygenated blood
Arteries
O blood away from heart
thick muscular walls
high BP
Veins
DO blood towards heart
thin walls
low BP
Capillaries
allow diffusion of O to tissues
very thin walls
Blood functions
transport nutrients and waste
regulate body temp
protect body
Structure of blood
Plasma - 55%
White blood cells - 1%
Red blood cells - 45%
Cardiac Output equation
heart rate x stroke volume
Cardiac Output
liters of blood ejected from heart per min
Heart rate
times heart beats per min
Stroke volume
ml of blood ejected from L ventricle per beat
