EXSC 224 Final Exam Questions and Answers
100% Verified Graded A+
1. Which tunic of an artery is most responsible for maintaining blood pressure
and continuous blood circulation?
Answer: tunica media
2. Cardiac muscle cells are like skeletal muscle cells in that they have .
Answer: I and A bands
3. The tricuspid valve is closed when the ventricle is in .
Answer: systole
4. Fred's blood was determined to be AB positive. What does this mean?
Answer: there are no antibodies to A, to B, or to Rh antigens in the plasma.
5. What is the average normal pH range of blood?
Answer: 7.35-7.45
6. What component of blood is responsible for the initiation of the blood
clotting process?
,Answer: platelets
7. The source of blood carried to capillaries in the myocardium would be the
.
Answer: coronary arteries
8. When are the atria and ventricles simultaneously in systole?
Answer: They aren't
9. If the vagal nerves to the heart were cut, the result would be that .-
Answer: the heart rate would increase by about 25 beats per minute.
10. Compared to skeletal muscle, cardiac muscle .
Answer: has no gap junctions that allow it to act as a functional syncytium.
11. During periods of ventricular filling .
Answer: blood flows mostly passively through the atria and the open AV valves into the ventricles.
12. Norepinephrine acts on the heart by .
Answer: causing threshold to be reached more quickly
13. Blood within the pulmonary veins returns to the .
Answer: left atrium
14. What organ in the body regulates erythrocyte production?
Answer: kidney
,15. What is isovolumetric contraction?
Answer: the short period during ventricular systole when the ventri- cles are completely closed
chambers.
16. 85% of Americans carry the Rh agglutinogen on their RBCs.
Answer: D
17. A blood vessel that contains one-way valves is known as .
Answer: a vein
18. A lack of intrinsic factor, leading to a deficiency of vitamin B12 and causing
an appearance of large pale cells called microcytes, is a characteristic of
.
Answer: pernicious anemia
19. If we were able to artificially alter the membrane permeability of pacemaker
cells so that sodium influx is more rapid, .
Answer: threshold is reached more quickly and heart rate would increase.
20. Factors that aid venous return
Answer: 1. sympathetic nerve activity that stimulates smooth muscle contraction in the venous
walls and reduces compliance
2. skeletal muscle pump, which squeezes veins during muscle contraction
3. pressure ditterence between the thoracic and abdom. cavities which promotes the blood of venous blood back to
, the heart.
4. respiratory pump
21. The arteries that directly feed into the capillary beds are called .
Answer: ar- terioles
22. Jenny was studying for EXSC 224 exam when a friend came up from behind
and startled her causing her heart rate to increase due to an increase in
sympathetic activity. the sympathetic nervous system increased Jenny's heart
rate primarily by .
Answer: causing threshold to be reached more quickly
23. An incompetent valve increases the stress on the heart because .-
Answer: the valve leaks and a portion of the blood pumped must be pumped twice.
24. During what phase of the cardiac cycle does intraventricular pressure rise
and the pulmonary valve is open?
Answer: ventricular ejection
25. Site where blood pressure is lowest
Answer: large veins
26. Site where exchanges of food and gases are made
Answer: capillaries
100% Verified Graded A+
1. Which tunic of an artery is most responsible for maintaining blood pressure
and continuous blood circulation?
Answer: tunica media
2. Cardiac muscle cells are like skeletal muscle cells in that they have .
Answer: I and A bands
3. The tricuspid valve is closed when the ventricle is in .
Answer: systole
4. Fred's blood was determined to be AB positive. What does this mean?
Answer: there are no antibodies to A, to B, or to Rh antigens in the plasma.
5. What is the average normal pH range of blood?
Answer: 7.35-7.45
6. What component of blood is responsible for the initiation of the blood
clotting process?
,Answer: platelets
7. The source of blood carried to capillaries in the myocardium would be the
.
Answer: coronary arteries
8. When are the atria and ventricles simultaneously in systole?
Answer: They aren't
9. If the vagal nerves to the heart were cut, the result would be that .-
Answer: the heart rate would increase by about 25 beats per minute.
10. Compared to skeletal muscle, cardiac muscle .
Answer: has no gap junctions that allow it to act as a functional syncytium.
11. During periods of ventricular filling .
Answer: blood flows mostly passively through the atria and the open AV valves into the ventricles.
12. Norepinephrine acts on the heart by .
Answer: causing threshold to be reached more quickly
13. Blood within the pulmonary veins returns to the .
Answer: left atrium
14. What organ in the body regulates erythrocyte production?
Answer: kidney
,15. What is isovolumetric contraction?
Answer: the short period during ventricular systole when the ventri- cles are completely closed
chambers.
16. 85% of Americans carry the Rh agglutinogen on their RBCs.
Answer: D
17. A blood vessel that contains one-way valves is known as .
Answer: a vein
18. A lack of intrinsic factor, leading to a deficiency of vitamin B12 and causing
an appearance of large pale cells called microcytes, is a characteristic of
.
Answer: pernicious anemia
19. If we were able to artificially alter the membrane permeability of pacemaker
cells so that sodium influx is more rapid, .
Answer: threshold is reached more quickly and heart rate would increase.
20. Factors that aid venous return
Answer: 1. sympathetic nerve activity that stimulates smooth muscle contraction in the venous
walls and reduces compliance
2. skeletal muscle pump, which squeezes veins during muscle contraction
3. pressure ditterence between the thoracic and abdom. cavities which promotes the blood of venous blood back to
, the heart.
4. respiratory pump
21. The arteries that directly feed into the capillary beds are called .
Answer: ar- terioles
22. Jenny was studying for EXSC 224 exam when a friend came up from behind
and startled her causing her heart rate to increase due to an increase in
sympathetic activity. the sympathetic nervous system increased Jenny's heart
rate primarily by .
Answer: causing threshold to be reached more quickly
23. An incompetent valve increases the stress on the heart because .-
Answer: the valve leaks and a portion of the blood pumped must be pumped twice.
24. During what phase of the cardiac cycle does intraventricular pressure rise
and the pulmonary valve is open?
Answer: ventricular ejection
25. Site where blood pressure is lowest
Answer: large veins
26. Site where exchanges of food and gases are made
Answer: capillaries
