Blood Vessels and Cardiovascular
Cardiovascular System: Blood Vessels
Laszlo Vass, Ed.D. Version 42-0008-01-01
Purpose
Please explain the purpose of this lab. Include in your explanation the major concepts you learned and any safety concerns associated with the lab. Purpose is to understand how the veins and arteries run through the body and how they function while the heart beats, where they deliver and drain blood to/from and how the cardiovascular system works together. Lock up the dogs while dissecting. wear face mask to protect from smells and splatter. take caution using sharp objects. do not be distracted.
Exercise 1: Microscopic Structure of Blood Vessels Observations Sketch your slide in the space below and label the structures indicated in the procedure. Be sureto include a description of the structures you observed on the slide
A. Describe the three layers of the wall of an artery.
Tunica Externa (adventitia): strong outer covering (also found in veins). It is composed of elastic fibers, collagen and connective tissue. This layer allows for stretch and prevents overexpansion of the artery wall from blood flow and pressure.
Tunica Media: Smooth muscle, elastic fibers. They are thicker in arteries than in veins to prevent a rupture in the artery. Vasomotion (change in the diameter of the blood vessels.
Tunica Interna (Intima): Inner layers of elastic membrane lining and smooth simple squamous called endothelium. This layer is exposed to blood and secretes a chemical that stimulates dilation or constriction of the vessel. Also helps repel platelets and blood so they do not stick to the walls--->>> Thrombus or clotting--->>>Can also occur if damage happens to endothelium.
This layer is also selectively permeable.
B. How do arterial walls differ from venous walls? There are 3 class sizes of arteries vs veins. Also the resistance of the vessel walls. Arteries are extremely strong resilient tissue structure because of the way
Laszlo Vass, Ed.D. Version 42-0008-01-01
Purpose
Please explain the purpose of this lab. Include in your explanation the major concepts you learned and any safety concerns associated with the lab. Purpose is to understand how the veins and arteries run through the body and how they function while the heart beats, where they deliver and drain blood to/from and how the cardiovascular system works together. Lock up the dogs while dissecting. wear face mask to protect from smells and splatter. take caution using sharp objects. do not be distracted.
Exercise 1: Microscopic Structure of Blood Vessels Observations Sketch your slide in the space below and label the structures indicated in the procedure. Be sureto include a description of the structures you observed on the slide
A. Describe the three layers of the wall of an artery.
Tunica Externa (adventitia): strong outer covering (also found in veins). It is composed of elastic fibers, collagen and connective tissue. This layer allows for stretch and prevents overexpansion of the artery wall from blood flow and pressure.
Tunica Media: Smooth muscle, elastic fibers. They are thicker in arteries than in veins to prevent a rupture in the artery. Vasomotion (change in the diameter of the blood vessels.
Tunica Interna (Intima): Inner layers of elastic membrane lining and smooth simple squamous called endothelium. This layer is exposed to blood and secretes a chemical that stimulates dilation or constriction of the vessel. Also helps repel platelets and blood so they do not stick to the walls--->>> Thrombus or clotting--->>>Can also occur if damage happens to endothelium.
This layer is also selectively permeable.
B. How do arterial walls differ from venous walls? There are 3 class sizes of arteries vs veins. Also the resistance of the vessel walls. Arteries are extremely strong resilient tissue structure because of the way