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Question 1 of 6

1. Question
The main function of the circulatory system is to
- transport oxygen to the lungs.
- transport oxygen and nutrients to the tissues of the body, and carry waste products from the tissues to the kidneys.
- cause the heart to contract.
- All of the above are functions of the circulatory system.
Question 2 of 6

2. Question
The electrical activity in the heart causes it to contract. This electrical activity includes
- the firing of the SA node.
- the conduction of the impulse through the AV node.
- the conduction of the impulse through the Purkinje system in the ventricles.
- All of the above occur during cardiac electrical activity.
Question 3 of 6

3. Question
Atrial fibrillation is characterized by
- rapid atrial ectopic tachycardia, with a rate that ranges from 240 to 450 beats per minute.
- chaotic impulses propagating in different directions and causing disorganized atrial depolarizations without effective atrial contraction.
- a ventricular ectopic pacemaker.
- contractions that originate in the atrial conduction pathways or atrial muscle cells and occur before the next expected SA node impulse
Question 4 of 6

4. Question
The long QT syndrome (LQTS)
- is characterized by a prolongation of the QT interval.
- may turn into torsades de points and sudden cardiac death.
- may be hereditary or acquired.
- is described in all of the above statements.
Question 5 of 6

5. Question
Second degree heart block
- is characterized by complete failure of conduction of one or more impulses from the atria to the ventricles.
- may be type I, type II or type III.
- may have a constant PR interval or may have a PR interval that becomes progressively lengthened until it drops.
- always requires an external pacemaker.
Question 6 of 6

6. Question
The ECG
- is a representation of the heart’s electrical activity.
- documents spatial information about the heart’s electrical activity in 3 directions.
- can cause misdiagnosis if done incorrectly.
- All of the above statements are correct about the ECG.

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