lecture_notes_21_(ta)

lecture_notes_21_(ta) - (TA NOTES IN RED) Lecture 21:...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
( TA NOTES IN RED ) Lecture 21: Cardiovascular System - Circulation and Blood Pressure I Reading: chapter 10, sections: intro, arteries, arterioles, pgs 337-351 (pgs 343-357, if using 5 th edition) Circulation and Blood Pressure - The systemic and pulmonary circulation each consist of a closed system of vessels that transport blood to the tissues in parallel (Figures 10-1,10-4) . Arteries - composed of large vessels that carry blood from the heart. Arterioles - small diameter vessels that arise from the branching of arteries when they reach the organs they are supplying. Capillaries - the smallest diameter vessels that are formed when arterioles branch. These vessels transport oxygen, nutrients and wastes to and from the tissues. Venules - the vessels that form when capillaries join together. Veins - large diameter vessels that are formed when venules merge together. They return blood to the heart. Microcirculation - the name given to the collection of arterioles, capillaries and venules. A o r t a L a r g e A r t e r i a l A r t e r i o l e s C a p i l l a r i e s L a r g e V e n a C a v a B r a n c h e s V e i n s f e a t u r e 1 1 0 0 ’ s ½ m i l l i o n 1 0 b i l l i o n 1 0 0 ’ s 2 i n t e r n a l r a d i u s n u m b e r 1 . 2 5 c m . 2 c m 3 0 μ m 3 . 5 μ m . 5 c m 3 c m t o t a l c r o s s - s e c t i o n a l a r e a 4 . 5 c m 2 2 0 c m 2 4 0 0 c m 2 6 , 0 0 0 c m 2 4 0 c m 2 1 8 c m 2 F e a t u r e s o f B l o o d V e s s e l s
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Features of Blood Vessels ( 1 ) Blood flow ( DEALS WITH PRINCIPLES OF FLUID DYNAMICS ) - the rate of blood flow through the circulation depends on the pressure gradient in the vessels, the resistance to flow caused by friction, and the viscosity or thickness of the blood. This relation can be expressed by the simple equation: F LOW = P RESSURE GRADIENT /R ESISTANCE ; where ( KNOW THIS , AND THINK ABOUT THE RELATIONSHIPS . E . G . IF
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 4

lecture_notes_21_(ta) - (TA NOTES IN RED) Lecture 21:...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online