1) Enumerate and describe (major features and function) the different blood vessel types.

2. What are the structure of the walls of arteries and veins? And describe each tunic/layer.

1. Enumerate and describe major features and function of the different types blood vessels

veins- they are transverse cross section located throughout the body.they return deoxygenated blood to the heart

• veins have valves to prevent backflow of blood and
• the vein lumen has a smooth endothelium
• they have thin walls are are less elastic compared to arteries.their venous pressure is low this feature allows them to hold a very high percentage of blood in circulation

2 arteries- arteries carry blood away from the heart.pulmonary arteries transport blood that has a low oxygen content from the right ventricle to the lungs while systemic arteries transport oxygenated blood from the left ventricle to the body tissues.aeteries are a masculine tubes lined by smooth tissue.arteries have abundance of elastin tissue and less smooth muscle to accommodate the high pressure of blood flowing through them.the presence of elastin enables the blood vessel to increase in size and alter their diameter

3 capillary- they are the smallest and the most numerous of the blood vessels ,they form the connection between the veins and the arteries.their primary function is the exchange of materials between the blood and tissue cells this is facilitated by their thin walls.the arteriolar lumen regulates the blood flow through the veins

1. what are the structures of the walls pf arteries and veins and describe each layer

the walls of veins have three layers

1. tunica intima-the inner layer consisting of an endothelial lining which provides a frictionless pathway for the movement of blood
2. tunica media is the middle layer composed of elastic and muscular tissues which regulates the internal diameter of the vessel
3. tunica adventitia- this is the outer layer consists of connective tissue and its the thickest layer of the vein and arteries which provide structural support and shape of the blood vessels

with each layer the amount of muscle and collagen fibrils varies depending on the size and the location of the vessel in the body