Circulatroy system Flashcards
What is the names of the lower chambers
ventricles
What is the name of the upper chambers ?
atriums
What is the job of the ventricles
pump blood through the body
What is the function of the valves in the heart
Prevent backflow
Describe a atrium
Thin muscular wall to push blood into lower chamber
Right side receives blood from the body through the vena cava ( Deoxygenated )
receives blood form the lungs through the pulmonary vein ( Oxygenated )
Describe the ventricles
Thick muscular wall , Lv a lot thinner
Right ventricle sends blood to lungs through pulmonary artery
Left ventricle sends blood to whole body via aorta which splits into smaller arteries
Wall made of special cardiac muscle ( regulates contraction )
What is in blood
55 % plasma
1 % white blood cells
45 % red blood cells
Artery ?
Take blood from the heart to the lungs
thick muscle
small blood channel
high pressure
no valves
Capillary ?
Exchange surface
1 cell thick
Big lumen
Pressure start high end low
no valves
Takes blood from the artery to the vein
Vein ?
Takes blood to the heart
Thin muscle with elastic fibres
Wide lumen
low pressure
Valves to prevent back flow
Takes blood towards the heart
