heart Flashcards
where does deoxygenated blood enter the heart
right atrium
What side of the heart pumps blood to the lungs
right ventricle
Where does oxygenated blood enter the heart
the left atrium
What side of the heart pumps blood to the rest of the body
Left ventricle
What is the heart surrounded by
inelastic pericardial membranes
What do inelastic pericardial membranes do
prevent the heart from over-distending with blood
Where does the blood from the lower body enter
inferior vena cava
Where does the blood from the upper body enter
superior vena cava
Is the pressure when blood enters the right atrium high or low
low pressure
What happens when pressure builds up in the right atrium
the tricuspid valve opens to let blood pass into the right ventricle
What happens when both atrium and ventricle are full
the atrium contracts forcing all the blood into the right ventricle and stretching the ventricle walls
What does the tricuspid valve do as the right ventricle prepares to close
tricuspid valve closes preventing any backflow of blood to the atrium
What do tendinous cords do
Make sure valves aren’t turned inside out by the pressures exerted when the ventricles contracts
What is the pathway of blood when the right ventricle contracts
pumps deoxygenated blood through the semilunar valve into the pulmonary artery
What do semilunar valves do
prevent the backflow of blood into the heart
Where does oxygenated blood from the lungs enter
left atrium from the pulmonary vein
What happens when pressure in the left atrium builds up
the bicuspid valve opens between the left atrium and the left ventricle so the ventricle also fills with O2 blood
What happens when the left ventricle contracts
pumps O2 blood through semilunar valve into the aorta and around the body
Why does the left side of the heart need to be thicker (other than pumping it around the body)
It needs to overcome the resistance of the aorta and arterial systems of the whole body
What is the septum and its role
divides the heart which prevents the mixing of O2 and deO2 blood
