Cardiovascular system summary-Questions and Answers Graded A+

Cardiovascular system summary-Questions and Answers Graded A+ what is the heart - ANSWER-It's a muscular organ ("pump") which circulates blood and oxygen around your body. How big is the heart and where is it located? - ANSWER-size of your fist located slightly to the left of the thoracic cavity cardiovascular system - ANSWER-consists of the heart and blood vessels 4 chambers of the heart - ANSWER-right atrium right ventricle left atrium left ventricle purpose of the 4 heart chambers - ANSWER-The division protects oxygen-rich blood from mixing with oxygen-poor blood. 4 heart valves - ANSWER-tricuspid pulmonary mitral aortic function of heart valves - ANSWER-keep your blood moving in the correct direction by opening only one way and only when they need to. cusps/leaflets - ANSWER-Each valve has flaps, called leaflets or cusps, that open and close once during each heartbeat. Step 1 of cycle - ANSWER-The oxygen-poor blood fills the right atrium and then flows to the right ventricle, where it is pumped to the lungs through the pulmonary arteries. Step 2 of cycle - ANSWER-The lungs refresh the blood with a new supply of oxygen, which comes from the air that you breathe in. step 3 of cycle - ANSWER-The oxygenated blood then returns from the lungs and enters the left atrium. step 4 of cycle - ANSWER-The oxygen-rich blood then flows from the left atrium to the left ventricle. The blood is then pumped through the aorta that supplies blood to the body, providing issues around the body with oxygen systole - ANSWER-During systole, your ventricles contract, forcing blood into the vessels going to your lungs and body. diastole - ANSWER-Your ventricles then relax during diastole and are filled with blood coming from the upper chambers, the left and right atria. Then the cycle starts over again.