PSIO 202 Exam 1 Question and
answers already passed 2025/2026
Pathway of blood through heart and lungs starting with right atrium - correct answer ✔1. Right atrium
(deoxy blood)>> **tricuspid valve**
2. Right ventricle>> **pulmonary vavle**
3. Pulmonary trunk/arteries
4. Pulmonary capillaries **blood loses CO2 and gains O2 here**
5. Pulmonary veins (oxy blood)
6. Left atrium **bicuspid valve**
7. Left ventricle **aortic valve**
8. Aorta/systemic arteries
9. In systemic capillaries, **blood loses O2 and gains CO2**
10. Superior vena cava, inferior vena cava, and coronary sinus spill into right atrium again
Poorly-conducting tissue is found at_____
the presence of the poorly-conducting tissue slows the impulse by about _____ - correct answer ✔AV
border, small fibers, few gap junctions.
0.1 sec
this gives the atria time to FULLY EMPTY before the ventricles begin to contract.
the AV bundle (Bundle of His) leads to ___
, these transmit the action potential into the muscle of both ventricles.
the sequence of excitation is such that the______of the ventricles contract first, pushing the blood ____
- correct answer ✔right and left bundle branches. Transmits action potential to the bundle branches,
Purkinje fibers, and the muscle of both ventricles
lower portions, pushing blood upwards
Aortic (or pulmonary artery) blood pressure is also called...
What happens here? - correct answer ✔AFTERLOAD- ventricles can not eject blood from ventricles
until the pressure exceeds the pressure in the vessel
-increase in pressure=inclrease in stroke volume
End-diastolic volume is....
Impact on stroke volume?
(Stroke volume is the measure of force developed by heart muscle) - correct answer ✔PRELOAD
• The cardiac chambers are mechanical pumps, and therefore can pump ONLY what is delivered to them
• has a major impact on the stroke volume:
• Stroke volume cannot increase unless the rate of cardiac filling also increases
What is active contractility? - correct answer ✔the stimulation of the sympathetic nerves to the heart
answers already passed 2025/2026
Pathway of blood through heart and lungs starting with right atrium - correct answer ✔1. Right atrium
(deoxy blood)>> **tricuspid valve**
2. Right ventricle>> **pulmonary vavle**
3. Pulmonary trunk/arteries
4. Pulmonary capillaries **blood loses CO2 and gains O2 here**
5. Pulmonary veins (oxy blood)
6. Left atrium **bicuspid valve**
7. Left ventricle **aortic valve**
8. Aorta/systemic arteries
9. In systemic capillaries, **blood loses O2 and gains CO2**
10. Superior vena cava, inferior vena cava, and coronary sinus spill into right atrium again
Poorly-conducting tissue is found at_____
the presence of the poorly-conducting tissue slows the impulse by about _____ - correct answer ✔AV
border, small fibers, few gap junctions.
0.1 sec
this gives the atria time to FULLY EMPTY before the ventricles begin to contract.
the AV bundle (Bundle of His) leads to ___
, these transmit the action potential into the muscle of both ventricles.
the sequence of excitation is such that the______of the ventricles contract first, pushing the blood ____
- correct answer ✔right and left bundle branches. Transmits action potential to the bundle branches,
Purkinje fibers, and the muscle of both ventricles
lower portions, pushing blood upwards
Aortic (or pulmonary artery) blood pressure is also called...
What happens here? - correct answer ✔AFTERLOAD- ventricles can not eject blood from ventricles
until the pressure exceeds the pressure in the vessel
-increase in pressure=inclrease in stroke volume
End-diastolic volume is....
Impact on stroke volume?
(Stroke volume is the measure of force developed by heart muscle) - correct answer ✔PRELOAD
• The cardiac chambers are mechanical pumps, and therefore can pump ONLY what is delivered to them
• has a major impact on the stroke volume:
• Stroke volume cannot increase unless the rate of cardiac filling also increases
What is active contractility? - correct answer ✔the stimulation of the sympathetic nerves to the heart
