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Vessels (veins, arteries, and capillaries)

by: Janice Prieto

Vessels (veins, arteries, and capillaries) BIO 220-01

Marketplace > La Salle University > Biology > BIO 220-01 > Vessels veins arteries and capillaries
Janice Prieto
La Salle
GPA 2.65

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About this Document

These notes talk about the differences between vessels and how their walls are composed.
Structure and Function of Organisms
Geri Seitchik
biology 220
75 ?




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This 2 page Bundle was uploaded by Janice Prieto on Sunday March 13, 2016. The Bundle belongs to BIO 220-01 at La Salle University taught by Geri Seitchik in Spring 2016. Since its upload, it has received 19 views. For similar materials see Structure and Function of Organisms in Biology at La Salle University.


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Date Created: 03/13/16
Vessels There are three types of vessels:  Arteries: The tunica intima is made up of simple squamous endothelium The tunica media is made up of smooth muscle with a little elastic connective tissue. This is also the largest layer in the wall of an artery. The smooth muscle in the artery is controlled by the autonomic nervous system causing it to move blood through it. Large arteries have vessels supplying the wall of those arteries.  Veins: They have valves that jut out into the lumen. The purpose of these valves is to prevent the backflow of blood. The pressure is low inside veins.  Capillaries: The walls are made up of a single layer of endothelium simple squamous cells The thin layer of cells allows for absorption Arteries (red) have a higher pressure than veins (blue). Here you can see the difference between each. Capillary Exchange: Two forces control movement of liquids in capillaries, osmotic pressure and osmotic pressure. Osmotic causes liquids move into the capillaries and blood pressure causes liquids to move out of the capillaries. A B A is the arterial end, B is the vein end, where where Hydrostatic osmotic pressure is high Pressure is high and and Hydrostatic Pressure Osmotic Pressure is low is low The osmotic pressure and hydrostatic pressure cancel each other out 2


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