Class Notes (834,991)
New Zealand (288)
Physiology (14)
PHSL232 (9)
Lecture 7

Lecture 7.docx

4 Pages
103 Views
Unlock Document

Department
Physiology
Course
PHSL232
Professor
Daryl Schwenke
Semester
Spring

Description
Design of the Vascular System: overview Objectives:  Gain a general overview of the organisation of the vascular system: distribution of blood volume, cross sectional area and flow velocity; pressure gradient and in series resistances  To understand the specific structure of various vessel types- which are dependent on function Role of the Circulatory System:  Provide oxygen and nutrients to every cell in the body  To remove carbon dioxide and waste products from every cell in the body.  Requires: A driving force: i.e. pump = heart Conduit system: vascular bed  Two ‘juxtaposed’ systems: Systemic circulation Pulmonary circulation Left ventricle  aorta  arteries  arterioles  capillaries  venules  veins  vena cava  right atrium and ventricle Right ventricle  pulmonary artery  arterioles  capillaries  venules  pulmonary vein  left atrium and ventricle Basic structure of vessels : Blood flow, pressure and resistance:  Blood flow (Q) = L/min NB: velocity = speed, independent of volume (e.g. cm/s)  Pressure (P) = mmHg Pressure gradient is driving the force of flow  Resistance ® is a measure of the ‘friction’ that impedes flow, and is calculated: Note: Q, P, R change along the vascular pathway Poiseuille Relationship: relates pressure, tube direction, viscosity to ‘blood flow’  For laminar flow in a rigid, cylindrical tube, flow is proportional to the pressure difference between each end of the tube. Q is proportional to the fourth power of the radius Q is proportional to the viscosity of the fluid In the circulation, vessel length and blood viscosity are unlikely to change over the short term. Both pressure and radius (vessel c
More Less

Related notes for PHSL232

Log In


OR

Join OneClass

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

Sign up

Join to view


OR

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.


Submit