2402 Lab 32 Blood Vessels 1 
Anatomy and Physiology 2402
Lab Exercise 32
Blood Vessels
The primary goal of this lab is to learn the names of many blood vessels. You will use the models provided as well as pictures in your lab book.
Microscopic Structure of Blood Vessels
Tunica intima: lines the lumen of the blood vessel. Continuous with endocardium of heart. Is extremely smooth to decrease resistance to blood flow. (Made of epithelium)
Tunica media: More bulky middle coat. Composed of smooth muscle and elastin. Regulation in the diameter of blood vessels, which alters peripheral resistance and blood pressure.
Tunica externa (adventitia): Outermost tunic. Function is primarily supportive and protective (areolar and fibrous CT)
Picture
Generalized Structure of Arteries, Veins and Capillaries
Types of Blood Vessels
Elastic arteries: Contain much elastic tissue Larger arteries closer to the heart Must expand when heart pumps much blood into them and then passively recoil after blood passes by. Thus, must withstand pressure fluctuations
Muscular arteries: Have less elastic tissue, but substantial muscle tissue Smaller arteries farther from heart Exposed to less extreme pressure fluctuations
Veins: Far from heart Not subjected to pressure fluctuations Are low pressure vessels thus are thin walled Blood flows against gravity so
1. Have larger lumens
2. Have valves to prevent backflow
3. Skeletal muscle pump
Capillaries: Tiniest vessels One cell layer thick: endothelium with underlying basal lamina (tunica intima) Thinnest for making exchanges between blood and tissue cells
Activity One
Observing a vein and an artery on a microscope slide.
Major Systemic Arteries of the Body
Activity Two
Use the models provided to find arteries listed
Use pictures on the following pages to assist
Both models and pictures will be used on the test
Major Systemic Veins of the Body
Activity Three
Use the models provided to find veins listed
Use pictures on the following pages to assist
Lab Exercise 32
Blood Vessels
The primary goal of this lab is to learn the names of many blood vessels. You will use the models provided as well as pictures in your lab book.
Microscopic Structure of Blood Vessels
Tunica intima: lines the lumen of the blood vessel. Continuous with endocardium of heart. Is extremely smooth to decrease resistance to blood flow. (Made of epithelium)
Tunica media: More bulky middle coat. Composed of smooth muscle and elastin. Regulation in the diameter of blood vessels, which alters peripheral resistance and blood pressure.
Tunica externa (adventitia): Outermost tunic. Function is primarily supportive and protective (areolar and fibrous CT)
Picture
Generalized Structure of Arteries, Veins and Capillaries
Types of Blood Vessels
Elastic arteries: Contain much elastic tissue Larger arteries closer to the heart Must expand when heart pumps much blood into them and then passively recoil after blood passes by. Thus, must withstand pressure fluctuations
Muscular arteries: Have less elastic tissue, but substantial muscle tissue Smaller arteries farther from heart Exposed to less extreme pressure fluctuations
Veins: Far from heart Not subjected to pressure fluctuations Are low pressure vessels thus are thin walled Blood flows against gravity so
1. Have larger lumens
2. Have valves to prevent backflow
3. Skeletal muscle pump
Capillaries: Tiniest vessels One cell layer thick: endothelium with underlying basal lamina (tunica intima) Thinnest for making exchanges between blood and tissue cells
Activity One
Observing a vein and an artery on a microscope slide.
Major Systemic Arteries of the Body
Activity Two
Use the models provided to find arteries listed
Use pictures on the following pages to assist
Both models and pictures will be used on the test
Major Systemic Veins of the Body
Activity Three
Use the models provided to find veins listed
Use pictures on the following pages to assist