Class Notes (809,890)
Canada (493,854)
York University (33,624)
KINE 2011 (149)
Gillian Wu (25)

6thFeb, 2011 Human Physio II.docx

6 Pages
Unlock Document

York University
Kinesiology & Health Science
KINE 2011
Gillian Wu

th 6 Feb, 2011 What does the Circulatory System Do? Blood is made up of 3 components 1.Plasma ( liquid water , few proteins in it 55% of the total) 2.Red Blood cells (45% of the total; % of hematocrit ; 3.Buffy Coat (platelets, white blood cells , very small portion ) Transports CO 2nd O 2 Substrates Immunological agents (things that fight infection) 2. Regulates temperature - The way we get rid of increase in temp, is by taking blood from our core and putting it to our skin and allowing it to interact with environment to cool off. The Design of the System Heart is the central pump of everything; we have 2 systems Pulmonary circulation and Systemic Circulation Pulmonary: when the blood goes from the heart into the lungs and becomes oxygenated comes back to the heart and gets sent rest to the body. Pulmonary artery has deoxygenated blood -Low Pressure -Arteries take blood away from heart, Veins bring blood back to the heart. -Low pressure Arterial System: Oxygenated blood comes from the lungs, into the left side of the heart; it goes out through aorta into the arteries. -Arteries take blood away from heart. -Very high pressure because we have to take blood from our heart to circulate to our entire body (height of the person more pressure) -120mmHg/ 80mmHg is your blood pressure -10-15% of our blood is in our arteries (low volume) -The blood goes form the heart to where we need it in our organs our tissues. - Branching out slows the pressure ( allows us to offload oxygen and picks up waste products which takes time) Venous System: -Blood goes back to the heart with a fairly low pressure -60-70% blood is in our veins, after its gone through the tissues -Pseudopumping system is on the venous side Blood Flow at Rest Heart 4% (cardiac output pumps 5L/min) Brain ( only uses 13%) Skin (9% in a normal room, but it was hot more than 9%) Kidneys 20% (1/5 of the blood volume is going to kidneys because it’s a purification system and regulator of blood pressure) Skeletal muscle ( 1/5 of the blood is skeletal muscles because they are metabolic tissuses, even when you are resting they are producing Co2 and O2) Athletes can pump 30-33 L/min Heart pumps 72 beats perminute Anatomy of the Heart Heart is made up of myo(muscle) cardium(heart) walls( ball of muscles) with 4 holes (chambers) 2 Atria (right & left) ---TOP 2 Ventricles (right & left)—BOTTOM Moves via bulk flow, we need pressure gradients to move. We create pressure gradients via muscle contraction. Contract the muscles increases pressure in the heart. The Heart The direction of blood flow within the heart regulated by valves. - They are one way, and prevent back flow. -Valves are also in the veins that prevent blood from going backwards. -Opened passively by pressure gradients. - Picture (Atria blue) Ven (Red) -Valves Close -Ventricle contracts, makes the container smaller ( pressure increases; Boyles law) -Pressure is greater in Ventricle than it is in the atria; it pushes back on the valves and closes them and blood can’t go that way. The blood will go out where we want it to ( if these valves are not there the valves will go back and forth continuously) Valve Open -Ventricles relax, pressure comes back to normal, atria contracts, pressure gets bigger in the atria( bigger in left side) opens valves blood flows through it. Valves Close (REPEATS) Atria relax; ventricles contract; valves closes ; blood does not back into the atria, it goes out to the pulmonary artery or aorta. Two things depend on pressure -Vol of blood -Size of container The HEART Figure TOP VIEW OF THE HEART -Between the right atrium and right ventricle valve (Right Atrial Ventricular –sep atrial from ventricle ) -Tricuspid Valve (3 cusps/flaps) -Left AV valvue ( only 2 therefore Bicuspid valve) -When the pressure builds up there is always a chance that the press gets too great in the ventricles ( you could break the valves) ; if you do that valves don’t close, system becomes insufficient. -In the wall of the ventricle, connected to these valves there are papillary muscles (prevent AV valve collapse) -Sometime the muscles get torn or ruptured then you have to fix them, (use pig valves) - 3 cusps valves ( semilunar valves since they look like half-moons) -All valves prevent blood backflow during pressure. Cardiac Muscle -Similar to skeletal muscle ( since it has actin and myosin since it makes cross-bridges; when muscle contracts it gets shorter) -Unlike skeletal muscles (cardiac muscle has sheets and connect end to end that makes heart walls) -Skeletal muscle does not connect end to end (all independent) -Contraction makes heart “Smaller” ; increasing pressure and squeezing the blood out -The pressure is increased in all 4 chambers -One of the difference between the cardiac muscle and Skeletal muscle is -The cells are joined by intercalated disks ( it allows transmission of action potential) -Can’t do this in skeletal muscl
More Less

Related notes for KINE 2011

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.