IgE immunoglobulins are involved in:

Correct Answer: B

Rationale: IgE is primarily involved in allergic reactions and parasitic infections, binding to mast cells and basophils to release histamine. IgG protects newborns via placental transfer, IgA protects mucosal areas, and IgM fights bacteria.

Correct Answer: D

Rationale: The nurse’s first step is to assess the client (D) by checking heart sounds and pulses, as dizziness may indicate pacemaker malfunction or hemodynamic instability. Assessment precedes diagnostic tests like EKG (B) or interrogation (A), and calling the provider (C) comes after initial data collection. (Source: Document, p. 4-5)

Correct Answer: B

Rationale: Blood pressure is highest in the left ventricle (B) during systole (~120 mmHg), as it pumps into the aorta. The right ventricle (C) peaks at ~25 mmHg, pulmonary artery (D) is lower, vena cava (A) is near 0 mmHg, and left atrium (E) is ~8-12 mmHg.

Correct Answer: B

Rationale: The pulmonary semilunar valve (B) prevents backflow from the pulmonary artery into the right ventricle during diastole. The aortic valve (A) protects the left ventricle, tricuspid (C) the right atrium, and bicuspid (D) the left atrium.

Correct Answer: A

Rationale: Heart block (A) occurs when AV node failure prevents impulse transmission to ventricles (e.g., third-degree block). MI (B) is tissue death, arrhythmia (C) is irregular rhythm, and ectopic pacemaker (D) is an abnormal impulse source.