Assignment 6 1. The endothelium is found in the a. tunica intima b. tunica media c. tunica
externa d. lumen 2. Closer to the heart, arteries would be expected to have a higher percentage of
a. endothelium b. smooth muscle fibers c. elastic fibers d. collagenous fibers 3. Which of the
following best describes veins? thick walled, small lumens, low pressure, lack valves thin
walled, large lumens, low pressure, have valves thin walled, small lumens, high pressure, have
valves thick walled, large lumens, high pressure, lack valves a. c. d. 4. An especially leaky type
of capillary found in the liver and certain other tissues is called a a. capillary bed b. fenestrated
capillary sinusoid cpillary d. metarteriole 5. The coronary arteries branch off of the a. aortic
valve b. ascending aorta c. aortic arch d. thoracic aorta 6. Arteries serving the stomach, pancreas,
and liver all branch from the a. b. superior mesenteric artery inferior mesenteric artery c. celiac
trunk d. splenic artery 7. The right and left brachiocephalic veins a. drain blood from the right
and left internal jugular veins b. drain blood from the right and left subclavian veins c. drain into
the superior vena cava d. all of the above are true
Solution
1. The endothelium is found in the a) tunica intima.
Tunica intima is a thin layer composed of thin squamous epithelial cells called endothelium.
2. Closer to the heart, arteries would be expected to have a higher percentage of c)elastic fibres.
More elastic fibres are required in the arteries near heart because during the pumping of blood,
the arteries need to expand to accommodate the larger volume of blood. Elastic fibers help in
this.
3. b) thin walled, large lumens, low pressure, have valves
All because veins have to withstand much less blood pressure as compared to arteries.
4. An especially leaky type of capillary found in liver an certain other tissues is called a c)
sinusoid capillary.
5. The coronary arteries branch off of the b) ascending aorta.
To be precise, coronary arteries branch off near where aorta and left ventricle meets.
6. Arteries serving the stomach, pancreas and liver all branch from the c) Celiac trunk.
7. The right and left brachiocephalic veins
d) all the above are true.
The brachiocephalic veins drain blood into superior vena cava from jugular veins and subclavian
veins.
externa d. lumen 2. Closer to the heart, arteries would be expected to have a higher percentage of
a. endothelium b. smooth muscle fibers c. elastic fibers d. collagenous fibers 3. Which of the
following best describes veins? thick walled, small lumens, low pressure, lack valves thin
walled, large lumens, low pressure, have valves thin walled, small lumens, high pressure, have
valves thick walled, large lumens, high pressure, lack valves a. c. d. 4. An especially leaky type
of capillary found in the liver and certain other tissues is called a a. capillary bed b. fenestrated
capillary sinusoid cpillary d. metarteriole 5. The coronary arteries branch off of the a. aortic
valve b. ascending aorta c. aortic arch d. thoracic aorta 6. Arteries serving the stomach, pancreas,
and liver all branch from the a. b. superior mesenteric artery inferior mesenteric artery c. celiac
trunk d. splenic artery 7. The right and left brachiocephalic veins a. drain blood from the right
and left internal jugular veins b. drain blood from the right and left subclavian veins c. drain into
the superior vena cava d. all of the above are true
Solution
1. The endothelium is found in the a) tunica intima.
Tunica intima is a thin layer composed of thin squamous epithelial cells called endothelium.
2. Closer to the heart, arteries would be expected to have a higher percentage of c)elastic fibres.
More elastic fibres are required in the arteries near heart because during the pumping of blood,
the arteries need to expand to accommodate the larger volume of blood. Elastic fibers help in
this.
3. b) thin walled, large lumens, low pressure, have valves
All because veins have to withstand much less blood pressure as compared to arteries.
4. An especially leaky type of capillary found in liver an certain other tissues is called a c)
sinusoid capillary.
5. The coronary arteries branch off of the b) ascending aorta.
To be precise, coronary arteries branch off near where aorta and left ventricle meets.
6. Arteries serving the stomach, pancreas and liver all branch from the c) Celiac trunk.
7. The right and left brachiocephalic veins
d) all the above are true.
The brachiocephalic veins drain blood into superior vena cava from jugular veins and subclavian
veins.
