PNB 2265 EXAM 1 QUESTIONS WITH VERIFIED ANSWERS LATEST
UPDATE 2026
This question refers to EKG traces in this figure below. At what point are the atria
repolarizing? - Answers QRS
Cardiac anastomoses - Answers Webbing of fibers in cardiac muscles only. They
pick up the slack of other fibers during contraction and act as bumping points for
communication between cells.
This question refers to the figure below. Which currents are NOT active during the
plateau phase of the action potential in panel A? (contractile myocyte) - Answers
Inward sodium current
Which of the following components of plasma is responsible for blood clotting? -
Answers fibrinogens
This question refers to EKG traces in the figure below. At what point are the
ventricles depolarizing? - Answers QRS
When mean arteriole blood pressure fails, baroreceptors in the _____ will _____ their
firing rate - Answers carotid arteries, decrease
Follow the correct path of blood through the heart, beginning at the LEFT ATRIUM:
- Answers Bicuspid valve --> Left Ventricle --> SL Valve --> Aorta
This question refers to the figure below. What effect will norepinephrine have on the
action potential shown in panel B? (pacemaker action potential) - Answers Increase
current through HCN channels
A pathological accumulation of fluid in the pericardium is called Cardiac Tamponade
- Answers True
FSK9027 is being investigated in clinical trials for its ability to increase cardiac
contractile force. This drug could work by - Answers activating ryanodine receptors
What is the correct sequence for the events of hemostasis, starting with damage to a
blood vessel? - Answers vasospasm --> platelet activation --> activation of thrombin
--> fibrin formation
carbon monoxide - Answers prevents oxygen from binding Hb
Iron released from hemoglobin is transported through the blood by _____ to the
_____. - Answers transferrin, bone marrow
Blood flow to a tissue will increase if - Answers the level of carbon dioxide at the
tissue increases
UPDATE 2026
This question refers to EKG traces in this figure below. At what point are the atria
repolarizing? - Answers QRS
Cardiac anastomoses - Answers Webbing of fibers in cardiac muscles only. They
pick up the slack of other fibers during contraction and act as bumping points for
communication between cells.
This question refers to the figure below. Which currents are NOT active during the
plateau phase of the action potential in panel A? (contractile myocyte) - Answers
Inward sodium current
Which of the following components of plasma is responsible for blood clotting? -
Answers fibrinogens
This question refers to EKG traces in the figure below. At what point are the
ventricles depolarizing? - Answers QRS
When mean arteriole blood pressure fails, baroreceptors in the _____ will _____ their
firing rate - Answers carotid arteries, decrease
Follow the correct path of blood through the heart, beginning at the LEFT ATRIUM:
- Answers Bicuspid valve --> Left Ventricle --> SL Valve --> Aorta
This question refers to the figure below. What effect will norepinephrine have on the
action potential shown in panel B? (pacemaker action potential) - Answers Increase
current through HCN channels
A pathological accumulation of fluid in the pericardium is called Cardiac Tamponade
- Answers True
FSK9027 is being investigated in clinical trials for its ability to increase cardiac
contractile force. This drug could work by - Answers activating ryanodine receptors
What is the correct sequence for the events of hemostasis, starting with damage to a
blood vessel? - Answers vasospasm --> platelet activation --> activation of thrombin
--> fibrin formation
carbon monoxide - Answers prevents oxygen from binding Hb
Iron released from hemoglobin is transported through the blood by _____ to the
_____. - Answers transferrin, bone marrow
Blood flow to a tissue will increase if - Answers the level of carbon dioxide at the
tissue increases
