Question 1

When stimulated, the branch of the nervous system will increase heart rate, AV conduction, and irritability.&#10;A)inherent&#10;B)pacemaker&#10;C)parasympathetic&#10;D)sympathetic

Accepted Answer

The sympathetic branch of the nervous system is responsible for increasing heart rate, AV conduction, and irritability through the release of adrenaline and noradrenaline. The parasympathetic branch has the opposite effect, decreasing heart rate and AV conduction. The inherent and pacemaker options are not relevant to this question as they do not refer to specific branches of the nervous system.

Question 2

The inherent rate of the AV junction is bpm.&#10;A)20-40&#10;B)60-100&#10;C)40-60&#10;D)100-

Accepted Answer

The inherent rate of the AV junction is typically around 40-60 bpm.

Question 3

The built-in rate of each of the three major areas of the conduction system is referred to as the rate.&#10;A)fast&#10;B)inherent&#10;C)escape&#10;D)heart

Accepted Answer

The built-in rate of each of the three major areas of the conduction system is referred to as the inherent rate.

Question 4

Part of the parasympathetic branch of the autonomic nervous system is the nerve.&#10;A)aortic&#10;B)vagus&#10;C)pericardial&#10;D)coronary

Accepted Answer

The vagus nerve is a part of the parasympathetic branch of the autonomic nervous system, which is responsible for regulating many bodily functions at rest. The other options (aortic, pericardial, and coronary) are not part of the parasympathetic branch of the autonomic nervous system.

Question 5

If polarizing is considered the ready state, then would be considered the recovery state.&#10;A)depolarization&#10;B)discharge&#10;C)repolarization&#10;D)polarization

Accepted Answer

During depolarization, the cell membrane potential becomes more positive, moving away from the polarized state. Discharge is not a term commonly associated with cell membrane potential. Repolarization refers to the return of the membrane potential to the polarized state after depolarization, making it the recovery state. Polarization refers to the initial, polarized state.

Question 6

Which is the normal pacemaker of the heart?&#10;A)AV junction&#10;B)SA node&#10;C)AV node&#10;D)ventricle

Accepted Answer

The normal pacemaker of the heart is the sinoatrial (SA) node, also known as the sinus node. It is located in the wall of the right atrium and generates the electrical impulses that control the heart rate. The other options listed are not the primary pacemaker of the heart. The AV junction and AV node are backup pacemakers and the ventricles can also act as a pacemaker, but at a slower rate and less efficiently than the SA node.

Question 7

After leaving the area of the AV node, impulses go through the to reach the right and left bundle branches.&#10;A)Bundle of His&#10;B)Purkinje fibers&#10;C)AV junction&#10;D)SA node

Accepted Answer

The Bundle of His is the pathway through which impulses travel after leaving the AV node to reach the right and left bundle branches, facilitating the coordinated contraction of the ventricles.

Question 8

The inherent rate of the SA node is bpm.&#10;A)30-60&#10;B)100-120&#10;C)60-100&#10;D)40-60

Accepted Answer

The SA node's inherent rate lies typically between 60 to 100 beats per minute. Therefore, the best choice is C. The other options are incorrect as they either lie outside this range or are too low/high for a typical heart rate.

Question 9

What term is used to refer to the process of electrical discharge and the flow of electrical activity?&#10;A)polarization&#10;B)repolarization&#10;C)depolarization&#10;D)polarized

Accepted Answer

Depolarization refers to the process of electrical discharge and the flow of electrical activity in a neuron or muscle cell. Polarization and repolarization are related processes but do not specifically refer to the flow of electrical activity. Polarized simply means that a cell or material has a separation of charges, and does not necessarily refer to the flow of electrical current.

Question 10

Which of the following does NOT happen when the sympathetic branch is stimulated?&#10;A)Ventricular conduction slows down.&#10;B)The heart becomes more irritable.&#10;C)Impulses go faster through the AV node.&#10;D)Heart rate increases.

Accepted Answer

When the sympathetic branch is stimulated, ventricular conduction speeds up instead of slowing down. Choices B, C, and D are all effects of sympathetic stimulation on the heart.

Question 11

Which of the following best explains the mechanism called irritability?&#10;A)A lower pacemaker site speeds up to take control of the heart.&#10;B)The normal pacemaker changes its inherent rate.&#10;C)The ventricles repolarize before they are ready.&#10;D)The normal pacemaker slows down and gives up control.

Accepted Answer

The answer of Which of the following best explains the...

Question 12

What is the term for the fail-safe mechanism that allows a lower pacemaker to take over when a higher site fails?&#10;A)AV conduction&#10;B)polarization&#10;C)escape&#10;D)irritability

Accepted Answer

The answer of What is the term for the fail-safe...

Question 13

Which of the following is NOT a part of the normal cardiac conduction system?&#10;A)AV node&#10;B)internodal pathways&#10;C)Purkinje Fibers&#10;D)coronary sinus

Accepted Answer

The answer of Which of the following is NOT a...

Question 14

Which cardiac cells are responsible for initiating and conducting pacemaker impulses?&#10;A)mechanical cells&#10;B)electrical cells&#10;C)atrioventricular cells&#10;D)motor cells

Accepted Answer

The answer of Which cardiac cells are responsible for initiating...

Deck 1: Electrophysiology