Download Biology 101 – Quiz 11 – Exercise 11 – The Circulatory System

Biology 101 – Quiz 11 – Exercise 11 – The Circulatory System
Name
For each of the following questions, put a circle around the item that does not belong (1 point). Then,
explain why you circled that particular item (4 points)
1.
Atherosclerosis
 Blood Flow Rate
 Blood Vessel Diameter
Fatty Plaques
Increased blood flow rate does not belong because in atherosclerosis, the presence of fatty plaques will
decrease blood vessel diameter and thus decrease blood flow rate
2.
Ventricular Contraction
Closed Tricuspid Valve
Open Bicuspid Valve
Tightened Tendinous Cords of the Tricuspid valve
When the ventricles contract, the openings between the atria and the ventricles must be closed in order to
prevent backflow of blood. This is accomplished in part by: a closed tricuspid valve, tightened tendinous
cords of the tricuspid valve and a CLOSED bicuspid valve.
3.
Superior Vena Cava
Pulmonary Artery
Aorta
Inferior Vena Cava
The aorta is the only one carrying oxygenated blood.
Short Answer Questions (5 points each)
1.
If a person has an incompetent bicuspid valve, their bicuspid valve (which connects the left atrium
and left ventricle) does not close properly. Why might such an individual be intolerant of
exercise? (THINK about what kind of blood is being pumped by the left side of the heart, and
what this blood is carrying)
With an incompetent bicuspid valve, every time the left ventricle contracted some blood would flow back
into the left atrium. As a result less oxygenated blood is being pumped out of the heart and to the muscles.
During exercise, muscles demand oxygen. If it is not available to them, the activity level cannot be
sustained
2.
You learned in lecture that heart attacks can be caused by a severe lack of oxygen available to the
heart cells. Angina (chest pain) can occur when there is a minor decrease in the oxygen available
to the heart muscle cells. Nitroglycerin is used to increase the blood flowing to the heart muscle
cells.
What blood vessels would nitroglycerin affect to reduce the angina?
(Coronary arteries, Coronary veins, Pulmonary arteries, Pulmonary veins)
How might nitroglycerin affect the diameter of those blood vessels in order to increase the flow
of blood through them?
It would increase the diameter
3.
Arrange the following blood vessels in order of oxygen content. Let the vessel with the most
oxygen be number 1 and the vessel with the least oxygen be number 4.
Inferior Vena Cava
4
Aorta
2
Pulmonary Veins
1
Capillaries in the forearm
3
TRUE or FALSE (1 point each)
1.
During exercise, blood flow to the skin decreases so as to facilitate the release of heat FALSE
2.
Blood leaving pulmonary capillaries has less oxygen than blood entering pulmonary capillaries
FALSE
3.
Blood leaving tissue capillaries in the big toe has more oxygen than blood entering big toe tissue
capillaries FALSE
4.
The right atrium is larger than the left ventricle FALSE
5.
The aortic semilunar valve does not have tendinous cords associated with it, while the pulmonary
semilunar valve does have tendinous cords associated with it. FALSE