Class Notes (1,100,000)
CA (620,000)
UTSC (30,000)
BIOC33H3 (100)
Lecture

Lecture 1


Department
Biological Sciences
Course Code
BIOC33H3
Professor
Stephen Reid

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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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