BIOL10002 Lecture Notes - Loose Connective Tissue, Windkessel Effect, Arteriole
Monday, April 9, 2018
Lecture 15: Diseases of the Cardiovascular system
Arteries &Arterioles
-Carries pressure blood away from heart — withstand high
-AORTA: expands during contraction phase pro cardiac cycle and contracts elastically
between contractions (Windkessel effect)
•Reduce pressure fluctuations between beats
•Propel blood into aorta & prevent back flow
-Arteries & Arterioles: Adjust diameter (resistance flow) to change amount of blood
flowing through them
•Pressure absorbed by the elastic recoil
-Structure (Refer to lecture notes)
•Tunica Intima (endothelium, Internal elastic lamina)
•Smooth muscle
•External elastic lamina
- endothelium produces factors that cause smooth muscle to perform vasoconstriction &
vasodilation
Veins
-Drain blood form capillary beds under very low pressure
-Venues & veins — capacitance vessels — ability to stretch and store blood
-2/3 blood volume found in veins
-Structure
•Valves (prevent back flow)
•Internal elastic lamina & endothelium (tunica lamina)
•Smooth muscle
•Loose connective tissue (No external elastic lamina)
!1
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Carries pressure blood away from heart withstand high. Aorta: expands during contraction phase pro cardiac cycle and contracts elastically between contractions (windkessel effect: reduce pressure uctuations between beats, propel blood into aorta & prevent back ow. Arteries & arterioles: adjust diameter (resistance ow) to change amount of blood. Owing through them: pressure absorbed by the elastic recoil. Structure (refer to lecture notes: tunica intima (endothelium, internal elastic lamina, smooth muscle, external elastic lamina. Endothelium produces factors that cause smooth muscle to perform vasoconstriction & vasodilation. Drain blood form capillary beds under very low pressure. Venues & veins capacitance vessels ability to stretch and store blood. Structure: valves (prevent back ow, internal elastic lamina & endothelium (tunica lamina, smooth muscle, loose connective tissue (no external elastic lamina) Venous return: gravity effects venous return, larger veins have string ome smooth muscle which contracts to assist venous return, deep vein thrombosis. Formation of blood clot in a deep vein.
