Question

Instructors may assign a portion of the Review Sheet questions ng Master ALP REVIEW SHEET Anatomy of Blood Vessels 2 DDDD Name Lab Time Date Microscopic Structure of the Blood Vessels 1. Cross-sectional views of an artery and of a vein are shown here Identity each on the lines to the sides, note the structural details that enabled you to make these identifications Now describe each tunic more fully by selecting its characteristics from the key below and placing the appropriate key letters on the answer lines Tunica intima Tunica media Tunica externa Key a b. d innermost tunic most superficial tunic thin tunic of capillaries regulate blood vessel diameter con smoothinuscle and elasin c 2. Describe the role that valves play in returning blood to the heart 3. Name two events occurring within the body that aid in venous return and 4. Considering their functional differences, why do you think the walls of arteries are proportionately thicker than those corresponding veins?

Answer 1

1. On the left side.

Vessel type : Artery

a) small lumen

b) round lumen and has thicker outer wall

On the right side.

Vessel type : Vein.

a) large lumen.

b) lumen is irregular shape and have thinner walls.

Tunica intima : a) innermost tunic.

c) thin tunic of capillary.

Tunica externa : b) most superficial tunic

   f) has a smooth surface

Tunica media : d) regulate blood vessel diameter

    e) contains smooth muscle and elastin.

2) Valves helps to open, when blood travels towards the heart and valves closes, so that it prevents backward flow of blood when the blood is going towards the heart.

3) Two events within the body that aid in venous return are respiratory pump and skeletal muscle contraction.

4) To withstand high pressure of blood coming out of heart, arteries need thick wall.