Question

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) (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?

          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)
(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?

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)
(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?

Added by Randall P.

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