Heart Structure Flashcards
What do the atria do?
Collect blood from pulmonary and systemic circuits.
What separates the left and right side of the heart?
Septum
What do the ventricles do?
Pump blood through body.
What is the function of the vena cava (great veins).
Superior- brings deoxygenated blood from head and neck
Inferior- brings deoxygenated blood from lower body.
Both into right atrium
Where else does blood flow back into the R atrium?
Coronary arteries.
Name the valves in R side of heart?
Tricuspid between R atria and R ventricle.
Pulmonary semi lunar valve into pulmonary artery
Name the valves on L side of heart?
Bicuspid or mitral valve Between L atria and L ventrical.
Aortic semi lunar valve into the aorta
Describe the blood flow through the heart?
Deoxygenated in IVC and SVC and con art ~into R A then R V~ into pulmonary trunk ~ then into lungs
Oxygenated blood now in heart from pulmonary vein~ into L A then LV~ into aorta~ then round the body.
What is the function of heart valves?
Ensure the correct flow of blood
Pressure increases in atrium blood pushes valve open
As ventricle contracts blood pushes up against the valve preventing back flow
Why is the L ventricle muscle thicker?
It has to pump blood through the whole body.
Cardiac muscle is myogenic, what does this mean?
Contracts without stimulation from the nervous system
What are the 3 layers of the heart wall?
Outer layer- epicardium
Smooth inner lining- endocardium
Myocardium- responsible for pumping action
Where does the heart get its blood supply?
Coronary arteries and veins
Where do the coronary arteries originate?
They immediately branch from the aorta
Name some disorders of the heart?
Angina MI Atherosclerosis Heart failure CCF
