In which phase of ventricular muscle action potent

ATI LPN

ATI LPN Test Bank

In which phase of ventricular muscle action potential is the potassium permeability the highest?

A. 0 B. 1 C. 2 D. 3

Correct Answer: D

Rationale: Phase 3 (repolarization) has the highest potassium permeability as potassium channels open to restore resting potential.

Which one of the following conditions would you normally expect to find decreased cardiac output?

A. Hyperthyroidism B. Anemia C. Atrioventricular fistula D. Acute myocardial infarction

Correct Answer: D

Rationale: Acute myocardial infarction impairs heart function, reducing cardiac output.

The origin of HDL is:

A. Liver and intestine B. Lymph nodes and the circulation C. Intestine and circulation D. Liver and bile

Correct Answer: A

Rationale: HDL is synthesized by the liver and intestine.

Which of the following bacteria produces glucans?

A. Staph epidermis B. Streptococcus mutans C. Viridans streptococci D. Staph aureus

Correct Answer: B

Rationale: Streptococcus mutans produces glucans, aiding dental plaque formation.

Which of the following histological feature is most commonly seen in thrombus formation?

A. Granuloma B. Giant cell C. Lines of Zahn D. White blood cells

Correct Answer: C

Rationale: Lines of Zahn, alternating layers of platelets and fibrin, are characteristic of thrombi.

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