Cardiac Electrophysiology

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Which of the following is true about the end of the P wave on an EKG?

The atria are half depolarized

The atria are completely depolarized (correct)

The atria are completely repolarized

The atria are mostly hyperpolarized

What is the dominant effect of activation of the vagal nerve (parasympathetic) on cardiac electrophysiology?

Increased automaticity in the SA node

Decreased conduction in the atria (correct)

Decreased conduction in the Purkinje Fibers

Decreased conduction in the AV node

Which ion movement would increase the slope of the pacemaker potential?

Increased outward movement of potassium

Increased inward movement of calcium via L-type calcium channels (correct)

Decreased inward movement of calcium via T-type calcium channels

Decreased inward current through the HCN (funny) channel

During the isovolumetric contraction phase of the heart, what happens to blood flow in the left coronary artery?

Blood flow increases Signup and view all the answers

Which of the following is true about veins?

Veins are much more compliant than arterioles Signup and view all the answers

Which symptom of angina is reported more frequently in women than in men?

Fatigue Signup and view all the answers

According to the myogenic theory of autoregulation, what happens to arterial vascular smooth muscle in response to an increase in internal pressure?

It contracts Signup and view all the answers

Which of the following is a characteristic that is shared by both hard and soft coronary artery plaque?

Cellular degradation exceeds growth Signup and view all the answers

Negative dp/dt is

An index of ventricular relaxation Signup and view all the answers

A drug company is developing a new drug to act on the arterial vascular system. This drug increases the activity of myosin light chain phosphatase. It is expected that this drug will be used to

Decrease blood flow to the tissues Signup and view all the answers

A predominant effect of a small release of epinephrine from the adrenal medulla would be

Vasoconstriction in the arterioles of the intestine Signup and view all the answers

Which of the following is a likely consequence of mild to moderate mitral stenosis?

Decreased cardiac output Signup and view all the answers

A decrescendo-crescendo diastolic murmur would be consistent with

Aortic regurgitation Signup and view all the answers

Which of the following is a characteristic that is shared by both hard and soft coronary artery plaque?

Cellular degradation exceeds growth Signup and view all the answers

Which of the following would be expected to DECREASE the amount of oxygen consumed by the heart?

A decrease in end diastolic volume Signup and view all the answers

The correct placement for the V1 precordial lead of the EKG is

4th intercostal space to the left of the sternum Signup and view all the answers

Malnutrition is associated with the development of ascites, i.e. edema fluid in the abdominal cavity. A mechanism that contributes to this effect is

An increase in capillary hydrostatic pressure Signup and view all the answers

An increase in arterial blood pressure from 130 to 190 mm Hg would be expected to produce a ________ in cerebral blood flow.

Sustained large increase Signup and view all the answers

Which of the following would increase vasoconstriction in vascular smooth muscle?

A decrease in myosin light chain phosphatase activity Signup and view all the answers

A murmur heard during the diastolic phase of the cardiac cycle would be consistent with

Aortic regurgitation Signup and view all the answers

One of the major effects of an increase in afterload on cardiac mechanics is

A decrease in stroke volume Signup and view all the answers

Which of the following would be the most appropriate strategy to slow conduction of the cardiac action potential through the ventricle?

Block potassium channels. Signup and view all the answers

Measurements taken in a typical continuous capillary indicate that plasma hydrostatic pressure is 32, plasma oncotic pressure is 27, interstitial hydrostatic pressure is -6 and interstitial osmotic pressure is 5. Under these conditions, there is a net

Filtration pressure of 16 mm Hg. Signup and view all the answers

An important factor contributing to the blister at the site of a burn is

An increase in capillary permeability. Signup and view all the answers

In a continuous capillary, the net filtration pressure is determined by the difference between

Plasma hydrostatic pressure and interstitial hydrostatic pressure. Signup and view all the answers

Which of the following would increase the hydrostatic pressure in a capillary?

Increased blood volume. Signup and view all the answers

Which of the following would decrease the oncotic pressure in a capillary?

Decreased plasma protein concentration. Signup and view all the answers

Which of the following would increase the interstitial hydrostatic pressure?

Increased blood flow. Signup and view all the answers

Which of the following would decrease the osmotic pressure in a capillary?

Decreased interstitial protein concentration. Signup and view all the answers

Which of the following would increase the reabsorption pressure in a capillary?

Decreased plasma oncotic pressure. Signup and view all the answers

Cardiac Electrophysiology

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Questions and Answers

Which of the following is true about the end of the P wave on an EKG?

What is the dominant effect of activation of the vagal nerve (parasympathetic) on cardiac electrophysiology?

Which ion movement would increase the slope of the pacemaker potential?

During the isovolumetric contraction phase of the heart, what happens to blood flow in the left coronary artery?

Which of the following is true about veins?

Which symptom of angina is reported more frequently in women than in men?

According to the myogenic theory of autoregulation, what happens to arterial vascular smooth muscle in response to an increase in internal pressure?

Which of the following is a characteristic that is shared by both hard and soft coronary artery plaque?

Negative dp/dt is

A drug company is developing a new drug to act on the arterial vascular system. This drug increases the activity of myosin light chain phosphatase. It is expected that this drug will be used to

A predominant effect of a small release of epinephrine from the adrenal medulla would be

Which of the following is a likely consequence of mild to moderate mitral stenosis?

A decrescendo-crescendo diastolic murmur would be consistent with

Which of the following is a characteristic that is shared by both hard and soft coronary artery plaque?

Which of the following would be expected to DECREASE the amount of oxygen consumed by the heart?

The correct placement for the V1 precordial lead of the EKG is

Malnutrition is associated with the development of ascites, i.e. edema fluid in the abdominal cavity. A mechanism that contributes to this effect is

An increase in arterial blood pressure from 130 to 190 mm Hg would be expected to produce a ________ in cerebral blood flow.

Which of the following would increase vasoconstriction in vascular smooth muscle?

A murmur heard during the diastolic phase of the cardiac cycle would be consistent with

One of the major effects of an increase in afterload on cardiac mechanics is

Which of the following would be the most appropriate strategy to slow conduction of the cardiac action potential through the ventricle?

Measurements taken in a typical continuous capillary indicate that plasma hydrostatic pressure is 32, plasma oncotic pressure is 27, interstitial hydrostatic pressure is -6 and interstitial osmotic pressure is 5. Under these conditions, there is a net

An important factor contributing to the blister at the site of a burn is

In a continuous capillary, the net filtration pressure is determined by the difference between

Which of the following would increase the hydrostatic pressure in a capillary?

Which of the following would decrease the oncotic pressure in a capillary?

Which of the following would increase the interstitial hydrostatic pressure?

Which of the following would decrease the osmotic pressure in a capillary?

Which of the following would increase the reabsorption pressure in a capillary?

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