Drag each label into the appropriate position to identify whether the characteristic is indicative of arteries or veins. Loosely referred to as "capacitance vessels" Exhibit greater ability to alter vessel diameter Pulsatile flow of blood Collapsed when empty Usually carry oxygenated blood from the heart to the body Provide for relatively consistent velocity of blood flow Contain the majority of blood at any one time Loosely termed "resistance vessels" Rely on the respiratory and skeletal muscular pumps to propel blood Loosely termed "pressure reservoirs" Arteries Veins
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Drag each label into the appropriate position to identify whether the characteristic is indicative of arteries or veins. Loosely referred to as "capacitance vessels" Exhibit greater ability to alter vessel diameter Arteries Veins Pulsatile flow of blood Collapsed when empty Usually carry oxygenated blood from the heart to the body Loosely termed "resistance vessels" Provide for relatively consistent velocity of blood flow Rely on the respiratory and skeletal muscular pumps to propel blood Contain the majority of blood at any one time Loosely termed "pressure reservoirs"
Adi S.
ONE: GENERAL CHARACTERISTICS OF BLOOD VESSELS 1. Describe the three tunics that form the wall of an artery or vein. 2. Define vasa vasorum. 3. Compare and contrast the structure and functions of elastic arteries, muscular arteries, and arterioles. 4. Describe the structure and function of capillaries, sinusoids, and capillary beds, and explain the structural basis of capillary permeability. 5. Explain how to distinguish a vein from an artery in histological sections. 6. Describe the structural features of arteries and veins that help maintain the flow of blood through these vessels. 7. Define vascular anastomoses and explain their functions. TWO: BLOOD VESSELS OF THE BODY 1. Define pulmonary and systemic circuits.
Microscopic Structure of the Blood Vessels 1. Cross-sectional views of an artery and of a vein are shown here. Identify each on the lines to the sides, note the structural details that enabled you to make these identifications: (vessel type) (a) (b) 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. innermost tunic b. most superficial tunic c. thin tunic of capillaries d. regulates blood vessel diameter e. contains smooth muscle and elastin f. has a smooth surface to decrease resistance to blood flow 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 of the corresponding veins?
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