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BIOC33H3 (127)

Lecture 1

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Biological Sciences
Stephen Reid

BIOC33 H3 Lecture 1 Cardiac output: amount of blood pumped out through the heart per unit time It is a function of the heart rate and the stroke volume which is the volume of blood pumped per beat Most important function is stopping from blood pressure to drop too low. Keeping it up so blood flow can go to organ that are sensitive O2 can have enough; High BP can kill but it will take a whole; low BP will kill in minutes Peripheral resistance: the resistance to blood flow within circulation taking place in small vessels and arterioles Therefore Blood pressure is measured as a function of Cardiac output and Peripheral resistance The most important things then are The heart rate, the stroke volume and the peripheral resistance having to do with all types of mechanisms ; all changes occurring in cardiovascular system effect these things Heart Anatomy 4 Chambered heart- left and right side; right atria and right ventricle; left atria and left ventricle Blood will come back from the systematic circulation via the vena cava (superior : upper body; inferior: lower body), emptying into the right atria Blood flows through an atrioventricular valve (tricuspid valve) to the right ventricle Right ventricle contracts and pumps blood up through the pulmonary arteries to the lungs Oxygenated blood returns to the heart via pulmonary veins and enters the left atria Blood moves from left atria to left ventricle and then pumped out to the aorta From the aorta the blood goes back into the systemic circulation Atria and ventricles are separated by interatrial septum
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