PNB 2265 EXAM 1 QUESTIONS AND
ANSWERS
This question refers to EKG traces in this figure below. At what point are the atria
repolarizing? - Correct Answers -QRS
Cardiac anastomoses - Correct 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) - Correct
Answers -Inward sodium current
Which of the following statements is TRUE about Fetal Hemoglobin (FHb)? - Correct
Answers -It is not affected by the sickle cell trait
Each hemoglobin molecule is able to bind _____ oxygen molecule(s) - Correct Answers
-Four
Which of the following components of plasma is responsible for blood clotting? - Correct
Answers -fibrinogens
This question refers to EKG traces in the figure below. At what point are the ventricles
depolarizing? - Correct Answers -QRS
When mean arteriole blood pressure fails, baroreceptors in the _____ will _____ their
firing rate - Correct Answers -carotid arteries, decrease
Follow the correct path of blood through the heart, beginning at the LEFT ATRIUM: -
Correct 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) - Correct Answers -
Increase current through HCN channels
A pathological accumulation of fluid in the pericardium is called Cardiac Tamponade -
Correct Answers -True
FSK9027 is being investigated in clinical trials for its ability to increase cardiac
contractile force. This drug could work by - Correct Answers -activating ryanodine
receptors
ANSWERS
This question refers to EKG traces in this figure below. At what point are the atria
repolarizing? - Correct Answers -QRS
Cardiac anastomoses - Correct 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) - Correct
Answers -Inward sodium current
Which of the following statements is TRUE about Fetal Hemoglobin (FHb)? - Correct
Answers -It is not affected by the sickle cell trait
Each hemoglobin molecule is able to bind _____ oxygen molecule(s) - Correct Answers
-Four
Which of the following components of plasma is responsible for blood clotting? - Correct
Answers -fibrinogens
This question refers to EKG traces in the figure below. At what point are the ventricles
depolarizing? - Correct Answers -QRS
When mean arteriole blood pressure fails, baroreceptors in the _____ will _____ their
firing rate - Correct Answers -carotid arteries, decrease
Follow the correct path of blood through the heart, beginning at the LEFT ATRIUM: -
Correct 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) - Correct Answers -
Increase current through HCN channels
A pathological accumulation of fluid in the pericardium is called Cardiac Tamponade -
Correct Answers -True
FSK9027 is being investigated in clinical trials for its ability to increase cardiac
contractile force. This drug could work by - Correct Answers -activating ryanodine
receptors
