A commercial enema is prelubricated and is inserted into the rectum

Correct Answer: C

Rationale: The correct answer is C: ¾ inch. This is the recommended insertion length for a prelubricated commercial enema. Inserting the enema too shallow (choices A and B) may not reach the colon effectively, leading to incomplete cleansing. Inserting it too deep (choice D) can cause discomfort or injury. Therefore, option C is the most appropriate length for safe and effective administration of a commercial enema.

Correct Answer: D

Rationale: The correct answer is D: Cardiomyopathy. Cardiomyopathy is a condition characterized by weakening of the heart muscle due to enlargement. This weakening impairs the heart's ability to pump blood effectively. A: Coronary artery disease involves blocked heart arteries, not weakening of the heart muscle. B: Angina pectoris is chest pain due to reduced blood flow to the heart muscle, not weakening of the heart muscle. C: Myocardial ischemia refers to reduced blood flow to the heart muscle, not the weakening and enlargement of the heart muscle seen in cardiomyopathy.

Correct Answer: D

Rationale: The correct answer is D: Pleur. The pleura is the double-layered membrane that covers and protects the lungs. The visceral pleura is in direct contact with the lung tissue, while the parietal pleura lines the chest cavity. This protective membrane helps reduce friction during breathing. Plaque (A), Pancreas (B), and Lymph (C) are incorrect choices. Plaque is a buildup of fatty deposits in arteries, not related to the lungs. The pancreas is an organ involved in digestion and hormone regulation, not part of the lung structure. Lymph refers to the fluid and the system that helps the body fight infections, not a membrane covering the lungs.

Correct Answer: C

Rationale: The correct answer is C: Blurred vision. The first symptom of a cataract is typically blurred vision, as the clouding of the lens causes light to scatter, leading to fuzzy or unclear vision. Reduced side vision (A) is not typically the first symptom, vomiting (B) is not associated with cataracts, and double vision (D) is more commonly linked to other eye conditions. Blurred vision is the hallmark initial symptom of cataracts due to the gradual clouding of the lens.

Correct Answer: D

Rationale: Immunotherapy is the correct answer because it uses antibodies or vaccines to boost the body's immune system to target and destroy cancer cells. It specifically targets malignant tumors without harming normal cells. Radiation therapy (A) uses high-energy rays to kill cancer cells, hormone therapy (B) blocks hormones that cancer cells need to grow, and chemotherapy (C) uses drugs to kill rapidly dividing cells, including cancer cells. However, only immunotherapy directly harnesses the immune system to fight cancer cells.