BIOL 252 Human Anatomy and Physiology II:
Module 4 Blood Vessels and Hemodynamics
Comprehensive Exam
SECTION I: ANATOMY AND HISTOLOGY OF BLOOD VESSELS
1. What are the three distinct layers, or tunics, that make up the wall of a typical blood
vessel?
Answer: Tunica intima, tunica media, and tunica externa.
2. Which tunic layer is composed of a simple squamous endothelium and its basement
membrane?
Answer: Tunica intima.
3. Which tunic layer is primarily responsible for vasoconstriction and vasodilation, and
which tissue type dominates it?
Answer: Tunica media, which is dominated by smooth muscle and elastic fibers.
4. What is the name of the system of tiny blood vessels found within the tunica externa
of large blood vessels that nourish the outer vessel wall?
Answer: Vasa vasorum.
5. How do elastic arteries differ functionally from muscular arteries?
, Answer: Elastic arteries (conducting arteries) act as pressure reservoirs to keep blood
flowing during diastole, while muscular arteries (distributing arteries) deliver blood to
specific organs and regulate flow via constriction.
6. What is the primary functional role of arterioles in the systemic circulation?
Answer: They are the primary resistance vessels that determine the flow of blood into
capillary beds and regulate systemic blood pressure.
7. Name the three types of capillaries based on their structural permeability.
Answer: Continuous capillaries, fenestrated capillaries, and sinusoid capillaries.
8. Which type of capillary is the least permeable and is most abundant in the skin,
muscles, and central nervous system?
Answer: Continuous capillaries.
9. Which type of capillary contains pores to allow for the rapid absorption or filtration of
small molecules, and where are they commonly found?
Answer: Fenestrated capillaries, found in the kidneys, small intestine, and endocrine
glands.
10. Which type of capillary has large, irregular lumens, large fenestrations, and fewer
tight junctions, allowing for the passage of whole blood cells?
Answer: Sinusoid capillaries (sinusoids).
11. Where in the body are sinusoid capillaries primarily found?
Answer: Liver, bone marrow, spleen, and adrenal medulla.
12. What is the name of the vessel that bypasses a capillary bed, connecting a terminal
arteriole directly to a postcapillary venule?
Answer: Vascular shunt (metarteriole-thoroughfare channel).
Module 4 Blood Vessels and Hemodynamics
Comprehensive Exam
SECTION I: ANATOMY AND HISTOLOGY OF BLOOD VESSELS
1. What are the three distinct layers, or tunics, that make up the wall of a typical blood
vessel?
Answer: Tunica intima, tunica media, and tunica externa.
2. Which tunic layer is composed of a simple squamous endothelium and its basement
membrane?
Answer: Tunica intima.
3. Which tunic layer is primarily responsible for vasoconstriction and vasodilation, and
which tissue type dominates it?
Answer: Tunica media, which is dominated by smooth muscle and elastic fibers.
4. What is the name of the system of tiny blood vessels found within the tunica externa
of large blood vessels that nourish the outer vessel wall?
Answer: Vasa vasorum.
5. How do elastic arteries differ functionally from muscular arteries?
, Answer: Elastic arteries (conducting arteries) act as pressure reservoirs to keep blood
flowing during diastole, while muscular arteries (distributing arteries) deliver blood to
specific organs and regulate flow via constriction.
6. What is the primary functional role of arterioles in the systemic circulation?
Answer: They are the primary resistance vessels that determine the flow of blood into
capillary beds and regulate systemic blood pressure.
7. Name the three types of capillaries based on their structural permeability.
Answer: Continuous capillaries, fenestrated capillaries, and sinusoid capillaries.
8. Which type of capillary is the least permeable and is most abundant in the skin,
muscles, and central nervous system?
Answer: Continuous capillaries.
9. Which type of capillary contains pores to allow for the rapid absorption or filtration of
small molecules, and where are they commonly found?
Answer: Fenestrated capillaries, found in the kidneys, small intestine, and endocrine
glands.
10. Which type of capillary has large, irregular lumens, large fenestrations, and fewer
tight junctions, allowing for the passage of whole blood cells?
Answer: Sinusoid capillaries (sinusoids).
11. Where in the body are sinusoid capillaries primarily found?
Answer: Liver, bone marrow, spleen, and adrenal medulla.
12. What is the name of the vessel that bypasses a capillary bed, connecting a terminal
arteriole directly to a postcapillary venule?
Answer: Vascular shunt (metarteriole-thoroughfare channel).
