Download BIOL 204 – Week 5 Lab

BIOL 204 – Week 3 Lab
Blood Vessel
Histology
Human Arteries
and Veins
Objective 1
Blood Vessel Histology
Arteries and Veins have three
tunics, or tissue layers:
Tunica intima (interna)
Inner layer of endothelium and
subendothelial areolar CT
Tunica media
smooth muscle and elastic tissue
Tunica adventitia (externa)
Dense irregular connective tissue
Comparison of arteries and veins:
Small artery: thick tunica media, thin
tunica externa
maintains its shape
Small vein: thin tunica media
thick tunica externa
collapsible
Objective 2
Some Human Arteries:
Objective 3
Major Veins of the Body
Objective 4
Pulmonary Circulation
Functions to bring deoxygenated blood to the lungs for gas exchange and
to bring oxygenated blood back to the heart for distribution to body
systems
Unlike systemic circulation, pulmonary circulation:
1.
is a low pressure pathway
2.
arteries carry deoxygenated blood; veins carry oxygenated blood
Objective 5
Trace The Flow of Blood In
Pulmonary Circulation
Objective 6
Arteries
Cerebral Circulation
Vessels of the Circle of Willis
Sheep’s Brain:
Structures of the Circle of Willis
Venous Drainage
Objective 7 and 8
Hepatic Portal Circulation
Hepatic portal circulation consists of veins that drain blood from digestive
viscera, the spleen and pancreas and deliver that blood to the liver for
processing:
1. Remove, store and bioconvert sugars, fatty acids and amino acids
2. Detoxification of the blood
3. Remove bacteria and other debris
Hepatic Portal System in the Cat:
A. Superior Mesenteric Vein
C. Hepatic Portal Vein
B. Inferior Mesenteric Vein
D. Gastrosplenic Vein
Objective 9 and 10
Fetal Circulation
The structures of fetal circulation allow the placenta to function as an
organ for nutrient, waste and gas exchange
Note that the:
Umbilical arteries carry
deoxygenated blood and that the
umbilical veins carry oxygenated
blood
The ductus venosus allows most
blood to bypass the nonfunctional
fetal liver
The foraman ovale and the
ductus arteriosus allows most
blood to bypass the nonfunctional
fetal lungs
Umbilical Arteries
and Umbilical Vein
of a Fetal Umbilical
Cord