PNB 2265 Exam 1 2026 | Questions & Answers | Latest
Update | Exam Prep
1. What is the primary ionic current that is active during the plateau phase of the
action potential in contractile myocytes?
Potassium current (I_K)
Chloride current (I_Cl)
Sodium current (I_Na)
Calcium current (I_Ca)
2. Which organ is primarily responsible for the production of erythropoietin
(EPO)?
Kidneys
Spleen
Heart
Liver
3. You are reading an ECG trace during an exercise test. If you wanted to
ensure the ventricles are depolarizing normally, what part of the trace would
you examine?
T. wave
QRS
P wave
ST segment
4. The hormone released by the kidneys in the figure above is ______ _.
, hemoglobin
vitamin K
adrenalin
erythropoietin
5. Arteries are under
highest pressure
lowest pressure
6. Based on the figure above, showing fetal (A) and adult (B) oxygen-
hemoglobin saturation curves, which of the following conclusions is true?
, At 50 percent saturation, fetal blood will have a higher affinity for
oxygen than adult blood will.
The mother binds oxygen with greater affinity than the fetus.
Adult saturation occurs at lower partial pressures of oxygen than fetal
saturation does.
As the partial pressure of oxygen increases, adult hemoglobin
approaches saturation faster than fetal hemoglobin does.
7. Describe the significance of hemoglobin's ability to bind oxygen in the
context of oxygen transport in the body.
Hemoglobin can only bind two oxygen molecules, which limits its
transport capacity.
Hemoglobin binds oxygen in the tissues and releases it in the lungs.
Hemoglobin's ability to bind four oxygen molecules allows for
efficient oxygen transport from the lungs to tissues.
Hemoglobin's binding of oxygen is not significant for oxygen
transport.
8. Which is correct in order of pressure from lowest to highest?
veins, venules, arterioles, arteries
veins, arteries, arterioles, ventricle
venules, veins, arterioles, arteries
veins, arterioles, venules, arteries
arteries, arterioles, venules, veins
9. What are the three main stages of hemostasis?
Platelet plug formation, coagulation, vascular spasm
Update | Exam Prep
1. What is the primary ionic current that is active during the plateau phase of the
action potential in contractile myocytes?
Potassium current (I_K)
Chloride current (I_Cl)
Sodium current (I_Na)
Calcium current (I_Ca)
2. Which organ is primarily responsible for the production of erythropoietin
(EPO)?
Kidneys
Spleen
Heart
Liver
3. You are reading an ECG trace during an exercise test. If you wanted to
ensure the ventricles are depolarizing normally, what part of the trace would
you examine?
T. wave
QRS
P wave
ST segment
4. The hormone released by the kidneys in the figure above is ______ _.
, hemoglobin
vitamin K
adrenalin
erythropoietin
5. Arteries are under
highest pressure
lowest pressure
6. Based on the figure above, showing fetal (A) and adult (B) oxygen-
hemoglobin saturation curves, which of the following conclusions is true?
, At 50 percent saturation, fetal blood will have a higher affinity for
oxygen than adult blood will.
The mother binds oxygen with greater affinity than the fetus.
Adult saturation occurs at lower partial pressures of oxygen than fetal
saturation does.
As the partial pressure of oxygen increases, adult hemoglobin
approaches saturation faster than fetal hemoglobin does.
7. Describe the significance of hemoglobin's ability to bind oxygen in the
context of oxygen transport in the body.
Hemoglobin can only bind two oxygen molecules, which limits its
transport capacity.
Hemoglobin binds oxygen in the tissues and releases it in the lungs.
Hemoglobin's ability to bind four oxygen molecules allows for
efficient oxygen transport from the lungs to tissues.
Hemoglobin's binding of oxygen is not significant for oxygen
transport.
8. Which is correct in order of pressure from lowest to highest?
veins, venules, arterioles, arteries
veins, arteries, arterioles, ventricle
venules, veins, arterioles, arteries
veins, arterioles, venules, arteries
arteries, arterioles, venules, veins
9. What are the three main stages of hemostasis?
Platelet plug formation, coagulation, vascular spasm
