the heart Flashcards
where does aorta take oxygenated blood?
● right side
● head
● left side
● lower body
where does pulmonary artery take oxygenated blood?
● right lung
● left lung
where does pulmonary vein bring deoxygenated blood from?
● right lung
● left lung
where does inferior vena cava bring deoxygenated blood from?
from lower body
where does superior vena cava bring deoxygenated blood from?
from upper body
what is the aorta?
an artery
what is the vena cava?
a vein
what are the 3 parts of the cardiac cycle?
● diastole
● atrial systole
● ventricular systole
what is the atrioventricular valve?
valve in between atrium and ventricle
what is the semi lunar valve?
valve in between ventricle and artery
what happens during a diastole?
● all muscle relaxes
● av valve open
● sl valve closed
● blood flows into the atria
● pressure is highest in the arteries
what happens during an atrial systole?
● atrial muscle contracts
● av valve open
● sl valve closed
● blood flows into ventricle
● pressure highest in atrium
what happens during a ventricular systole?
● ventricular muscle contracts
● av valve closed (prevents back flow of blood into the atria)
● sl valve open
● blood flows into arteries (pulmonary artery, aorta)
● pressure highest in ventricle
explain the structure of the heart
● deoxygenated blood returns from body in vena cava (vein) and enters right atrium
● blood then passes via an atrio-ventricular valve into the right ventricle and, via semi lunar valve, into the pulmonary artery
● blood passes through lungs and returns to left atrium via the pulmonary vein
● blood passes through second atrio-ventricular valve into the left ventricle and then passes through the semi-lunar valve into the aorta where it is pumped around the whole body
why is the left ventricle thicker?
● has thicker, muscular walls than right ventricle
● as it needs to contract powerfully to pump blood around entire body
