heart and blood Flashcards
def the heart
organ that pumps round the body
double circulatory pump
why is heart double pump
blood enters twice for one circuit around body
def route of blood cell trhlugh heart
body to vena cava to right atrium to right ventricle to pulmonary artery to lungs to pulmonary vein to left atrium to left vetricle to aorta to body
def function right ventricle
pump blood lungs for gas exchange
def function aorta
transport oxygenated blood under high pressure away from left ventricle
def function vena cava
return deoxygenated blood from body to right atrium
def function left ventricle
pump blood around rest of body
def function pulmonary artery
deoxygenated blood from heart to lungs
def function pulmonary vein
oxygenated blood lungs to heart
def how resting heart rate controlled
group of cells aka pacemaker
where is natural pacemaker
right atrium
def artifical pacemakers
electrical devices to correct irregularities in heart rate
def function arteries
oxygenated blood under high pressure from heart to body
def how arteries adapted for its function
narrow lumen
thick elastic walls to hold pressure
def function capillaries
transport blood cells
how are capillaries adapted
narrow so blood cells pass through one by one
thin walls for short diffusion pathway
def function veins
deoxygenated blood under high pressure from body to heart
def how veins adoated
thin walls
large lumen due to low pressure
valves to prevent backflow
how to calculate rate of blood flow
rate=volume/minutes
def blood
tissue made of plasma
red white blood cells and plasma are suspended
def plasma function
transport blood cells and dif substances like hormones around body
def what plasma transport
co2 urea hormones digestion products
def function red blood cell
transport oxygen around body
def function white blood cells
defend body from infection
