Assignment on Lecture Questions

Running head: LECTURE QUESTIONS
LECTURE QUESTIONS
Name of the Student:
Name of the University:
Author Note:

LECTURE QUESTIONS1
Answer 1.
The tunica layers differ from each other in both their composition and function. Those
three layers are tunica intima, tunica media and tunica externa respectively. Tunica intima is the
innermost layer of a blood vessel. It is mainly composed of the endothelium cells. The function
of tunica intima is to lower the friction as the blood moves through the vessels. Tunica media is
located between the tunica intima and tunica externa in a blood vessel. Tunica media is
composed of smooth muscle cells and elastin sheets. It helps in the regulation of blood
circulatory dynamics. Tunica externa is the layer that is located at the outer part of a blood vessel
and it is mostly composed of the collagen fibers. This layer mainly protects the vessel and helps
in the anchoring (Tonar et al. 2015).
Answer 2.
Blood flow can be defined as the volume of blood in ml passes through a blood vessel in
a unit amount of time. The blood circulation increases as the blood flow increases, if the blood
pressure and the resistance in the blood vessels stay constant (Kane et al. 2016). The blood
pressure is the force exerted by the inner walls of the blood vessels resulting from the blood
content inside the vessels. The increase in blood pressure results in the increased blood flow,
which in turn results in the increased blood circulation. The blood flows from the high pressure
areas from the low pressure areas. The surface area of the capillaries is the largest, while the
arterioles have the smallest surface area in the human body. Blood circulation has a proportional
relationship with the size of the surface area of the blood vessels.
Answer 3.
A. Common iliac vein