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Mercer - BIO 203 - Study Guide - Midterm

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Mercer - BIO 203 - Study Guide - Midterm

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background image Anatomy & Physiology II Exam 3 ____________________________________________________________________________ Chapter 20: The Circulatory System: Blood Vessels and Circulation  20.1 General Anatomy of the Blood Vessels  Expected Learning Outcomes (pg.744) Describe the structure of a blood vessel  o The walls of arteries and veins consist of 3 layers, which are called tunics  1. Tunica interna   inner layer  Consists of simple squamous endothelium Functions  Selectively permeable barrier  Secretes chemicals that cause vasomotion  Recruits leukocytes  2. Tunica media   thick middle layer  Consists of smooth muscle, collagen, and sometimes elastic 
tissue
Functions  Strengthens velles  Vasomotion 
background image 3. Tunica externa   outer layer  Consists of loose connective tissues  Functions  Anchors vessel to surrounding organs & tissues  Describe the types of arteries, capillaries, and veins  o Arteries  Conducting / Elastic  Largest   withstand the most pressure  Expands during systole and contracts during diastole  Moderated BP surges  Has a layer of elastic tissue­­ internal elastic lamina ­­ between 
tunica interna and tunica media 
Distributing  Medium­sized arteries that branch off to individual organs  Has layers of elastic tissue  Arteriole  Changes the amount of blood a specific tissue receives, based on 
its size 
Lots of smooth muscle  dramatic change in diameter  o Capillaries  Continuous  Most prevalent type of capillary 
background image Endothelial cells are held together by tight junctions and form a 
continuous tube 
Endothelial cells are separated by intercellular clefts, which allows
small molecules to pass through 
More tight junctions present in Blood­Brain Barrier  Fenestrated  Endothelial cells have filtration pores that allow small solutes to 
pass through 
Found in kidney & choroid plexuses  Sinusoid  Large gaps between endothelial cells allow passage of blood cells
and proteins 
Found in liver & bone marrow  o Veins  Postcapillary Venules  Smallest  Receive blood directly from capillaries or from the distal ends of 
thoroughfare channels 
More porous than capillaries and are capable of fluid exchange 
with surrounding tissues 
Serve as sites for leukocyte diapedesis  Medium Veins Thinner tunica than in arteries  Infolding of the tunica interna form venous valves, which helps 
prevent backflow of blood 
Large Veins 

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School: Mercer University
Department: Biology
Course: Human Anatomy & Physiology II
Professor: Katharine Northcutt
Term: Spring 2016
Tags: Anatomy & Physiology II
Name: Anatomy & Physiology II Exam 3 Study Guide
Description: This is the study guide, which reviews the expected learning outcomes in the textbook and in the lecture slides.
Uploaded: 03/15/2018
7 Pages 38 Views 30 Unlocks
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