Blood Vessel Anatomy
description
Transcript of Blood Vessel Anatomy
Blood Vessel Anatomy
Starter- write your answer!
• Explain how this patient’s cardiac output would be affected (if at all) by the electrical activity in their heart.
• Use the terms: – starling’s law– stroke volume– cardiac output
Essentials of Human Anatomy and Physiology, 9eby Elaine N. Marieb
Copyright © 2009 Pearson Education, Inc.,publishing as Pearson Benjamin Cummings.
Figure 11.9b Structure of blood vessels. (b) The walls of arteries and veins are composed of three tunics: the tunica intima (endothelium underlain by a basement membrane), tunica media (smooth muscle and elastic fibers), and tunica externa (largely collagen fibers).
Tunica intima• Endothelium
• Loose connective tissue
Tunica media
Tunica externa
Artery VeinLumen Lumen
Internal elastic lamina
External elastic lamina
Valve
Endothelium
Capillarynetwork
Capillary
ArterioleVenule
Basementmembrane
(b)
Essentials of Human Anatomy and Physiology, 9eby Elaine N. Marieb
Copyright © 2009 Pearson Education, Inc.,publishing as Pearson Benjamin Cummings.
Essentials of Human Anatomy and Physiology, 9eby Elaine N. Marieb
Copyright © 2009 Pearson Education, Inc.,publishing as Pearson Benjamin Cummings.
Figure 11.9b Structure of blood vessels. (b) The walls of arteries and veins are composed of three tunics: the tunica intima (endothelium underlain by a basement membrane), tunica media (smooth muscle and elastic fibers), and tunica externa (largely collagen fibers).
Tunica intima• Endothelium
• Loose connective tissue
Tunica media
Tunica externa
Artery VeinLumen Lumen
Internal elastic lamina
External elastic lamina
Valve
Endothelium
Capillarynetwork
Capillary
ArterioleVenule
Basementmembrane
(b)
Veins• Veins have valves to prevent
backflow of blood
• Prevent pooling– Pooling can create a clot that
can get stuck in the pulmonary artery (pulmonary embolism)
• Skeletal muscle contractions help venous return
https://www.youtube.com/watch?v=49jUyBu4M1Q&list=LPW8ZlZW8ZoPE&index=1&feature=plcp
Vericose Veins• Common in people who– stand for long periods of time– are obese or pregnant
• Occur when blood pools in the veins due to inactivity or low venous pressure
https://www.youtube.com/watch?v=7Qs6iWSGzZE&feature=related start at 25 sec
Cover the section on arthrosclerosis and
arteriolesclerosis (on study guide)
Capillary Beds (see fig. 11-11 in book)
• Precapillary sphincters- ring of smooth muscle, regulates blood flow through capillary beds– When open blood flows into
capillaries diffusion occurs – When closed blood flows
from arteriole to venule no diffusion occurs