VIBS 243 lab
Medical School Histology Basics
Blood and Lymph Vessels
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Medical School Histology Basics Blood and Lymph Vessels, Lecture notes of Histology
Today we want to examine: How does variation in histological characteristics of different vessels facilitates their contributions to these functions? How does ...
Typology: Lecture notes
2021/2022
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VIBS 243 lab
Medical School Histology Basics
Blood and Lymph Vessels
Introduction
Multicellular Organisms Need 3 Mechanisms
1. Distribute oxygen,
nutrients, and
hormones
2. Collect waste
3. Transport waste
to excretory
organs
CARDIOVASCULAR SYSTEM
HEART PRODUCES BLOOD
PRESSURE (SYSTOLE)
Ref code
10,16,
Pressure seen along the arterial pathway from a single heart beat
Velocity seen along the arterial pathway from a single heart beat
Two sets of closed vessels connected only at the heart
Body^ Lungs
Pulse seen as sudden change in pressure and velocity is seen only in the arterial pathway = no pulse in capillaries and venous pathway but steady flow
CARDIOVASCULAR SYSTEM
HEART contraction produces blood pressure during systole
but contraction smooth muscle in the walls of other blood vessels
reduces blood flow by reducing the caliber of the vessel lumen
Ref code
10,16,
Vessels vary in size, wall thickness, and shape and size of lumen to facilitate their functions
Variation in walls of blood vessels
accommodates mechanical factors and
metabolic needs
CARDIOVASCULAR
SYSTEM
MUSCULAR ARTERIES -
DISTRIBUTE BLOOD, MAINTAIN PRESSURE
ARTERIOLES - PERIPHERAL
RESISTANCE AND DISTRIBUTE
BLOOD
CAPILLARIES - EXCHANGE
NUTRIENTS AND WASTE
VENULES - COLLECT BLOOD FROM
CAPILLARIES (EDEMA)
Ref code
6,
Ref code
9
MUSCULAR
Ref code # 9 artery
Large vein
Note flattened endothelial cells viewed on their side and on face (flat side of
pancake) in arterioles in the iris (left side near the trabecular meshwork of the
monkey eye Slide 34412
Slide 34412
Fattened endothelial cells
Iris of
monkey
eye
Anterior chamber
On-face view
Arteriole
Dilator muscle
Epicardium
Myocardium
Fat
Slide HISTO
Connective tissue
Heart valves
Endocardium
Myocardium
Myocardium
Slide HISTO
Connective tissue
Heart valve
Endocardium
Myocardium
Endothelium
Endothelium
Connective tissue
Slide 427 Aorta
TUNICA MEDIA
TUNICA INTIMA
Elastic laminae
Smooth muscle cells
432 Lung elastic artery
Smooth muscle cells
Elastic laminae
TUNICA MEDIA
TUNICA
INTIMA
Endothelium
TUNICA
ADVENTITIA
Fibroblasts
Vasa vasorum