Lecture 9 - Unit#5 Unit Circulatory System Blood Vessels...

Info icon This preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Unit #5 Unit #5 Circulatory System Circulatory System Blood Vessels Intro & Blood Vessels Intro & Vessels of Head and Neck Vessels of Head and Neck
Image of page 1

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

View Full Document Right Arrow Icon
Blood Vessels - Intro Blood Vessels - Intro Blood vessels are the network of tubes that is used to carry blood throughout the body There are three types of: 1. Arteries Carries blood away from the heart Branch/diverge into smaller arteries and then arterioles 2. Veins Carries blood to the heart Merge/converge from small venules into larger veins 3. Capillaries Smallest blood vessels at the tissue level Fig. 19.1
Image of page 2
Blood Vessel Wall Structure Blood Vessel Wall Structure Hollow structure made up of a Lumen central blood-filled space Walls made of three layers Tunica intima (interna) contains the endothelium (a simple squamous epithelium) Tunica media circularly arranged smooth muscle and colagen and elastin fibrils Thicker in arteries than in veins Tunica externa layer of connective tissue (collagen and elastic fibers) that run longitudinally
Image of page 3

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

View Full Document Right Arrow Icon
Tunica media (smooth muscle and elastic fibers) Tunica externa (collagen fibers) Artery Vein Lumen Lumen Internal elastic membrane External elastic membrane Valve Endothelial cells Basement membrane Capillary network Capillary Tunica intima Subendothelial layer Endothelium Fig. 20.1
Image of page 4
Arteries Arteries Carry blood away from the heart Elastic (conducting) arteries largest arteries near the heart Aorta and its branches Muscular (distributing) arteries distal to elastic arteries to supply organ groups, organs or their parts Arterioles are small arteries Table 20.1
Image of page 5

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

View Full Document Right Arrow Icon
Capillaries Capillaries Body tissues are supplied by capillary beds a network of the smallest vessels Small arterioles transition into the
Image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern