Class Notes (807,350)
Canada (492,715)
KINE 3012 (22)
Tara Haas (22)
Lecture 16

Lecture 16 - Feb 27th.docx

3 Pages
Unlock Document

Humber College
Kinesiology & Health Science
KINE 3012
Tara Haas

Page 87 Vascular Circuit: Functions of the blood vessels - Left ventricle --> Arterial side of the system - Aorta is largest of the arteries - Blood vessels that take blood from one spot to another are usually arteries because these have to be able to withstand pressure - Veins have to have lower resistance in order to maintain blood pressure - Microcirculation, blood capillaries - Arteries/veins part of the macrocirculation - Millions capillaries optimized to allow the exchange of oxygen/nutrients - Blood picked up by the venules after the blood capillaries *venules also part of the microcirculation* - Then blood goes back into the veins *macrocirculation* - Veins are considered a reservoir of blood, can increase cardiac output if necessary - The vascular system is like a inverted tree, start with a trunk *aorta*, continuously branch out to many more blood vessels as it gets smaller Page 87B - Blood vessels composed of many different cell types - Layers compromising blood vessels - All inner layers of all blood vessels are endothelium cells *related to epithelial cells but do not mix them*, Unique position because they're directly exposed to blood and movement of blood, depend on them to give signals if there are problems - All endothelial cells are connected to connective tissue or extracellular matrix; large group of proteins that provide a meshwork that both create structure and points where the cells can attach to, collagen proteins or elastin proteins - Basement membrane, matrix proteins that are directly on the surface of the endothelial cells and attached to - Within layers of elastin, there are smooth muscle cells - Organised in a way that encircle the circumference of the blood vessel - It's a muscle, it does contract, as it shortens, it squeezes down the diameter of the blood vessel - Smooth muscle cell responsible for changing diameter of blood vessels/constriction, happens mostly in the arterials - Number of layers of smooth muscle dependent on the elastin layers, aorta has many repeats of these layers - Outer wrapping of the blood vessel, more extracellular matrix sheet made mostly of collagen - Notice that the elastin fibres are the most within the arteries - Capillaries are only made of a single cell type, endothelial cells - Vein are characterized by also having valves, - large veins have a larger diameter compared to a large artery - Diameter of vessels: Artery 4mm, Vein 5mm, capillary 5um Page 88 - Every level of our circulatory system requires a pressure gradient in order for blood to travel to the next blood vessel - Pressure keeps decreasing until it enters the right atrium - Why does pressure in the aorta never go down to 0? - The aorta is always filled with blood, so we consider this blood to have a certain filling pressure - The pressure d
More Less

Related notes for KINE 3012

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.