PHGY 214 Lecture Notes - Lecture 2: Vasa Vasorum, Mean Arterial Pressure, Blood Pressure
15 Nov 2017
School
Department
Course
Professor
Document Summary
Describe systolic and diastolic pressure and concept of mean arterial pressure. Know structural and functional properties of arteries. Serve as rapid transit passageways for blood from heart to organs. Due to large radius, arteries offer little resistance to blood ow. Act as pressure reservoir to provide driving force for blood when heart is relaxing. Elastin bres: provide elasticity to arterial walls. External elastic lamina and collages bers abundant in adventitia lamina. In large arteries they need own blood supply because nutrients cannot diffuse to all layers so blood vessels require own blood vessels for nutrients > vasa vasorum aka. Vessels of the vessels used to supple to external wall when wall is very thick. When systole happens, pressure in heart exceeds that of arteries so blood goes shooting out into arteries. Artery expands to accommodate incoming blood and energy stored in walls. Energy gets released during elastic recoil phase when diastole occurs so that blood continues to ow.
