A commercial enema is prelubricated and is inserted into the rectum

Correct Answer: C

Rationale: The correct answer is C: ¾ inch. This length is appropriate for inserting a prelubricated commercial enema into the rectum. Inserting it too shallow (choices A and B) may not reach the desired area for effective administration. Inserting it too deep (choice D) can potentially cause discomfort or injury. Therefore, ¾ inch strikes a balance between reaching the rectum effectively and avoiding unnecessary depth.

Correct Answer: D

Rationale: The correct answer is D: Cardiomyopathy. Cardiomyopathy is a condition characterized by weakening of the heart muscle due to enlargement, leading to reduced heart function. Coronary artery disease (A) involves blockages in the heart's blood vessels, not weakening of the heart muscle. Angina pectoris (B) is chest pain caused by reduced blood flow to the heart muscle, not weakening of the heart muscle itself. Myocardial ischemia (C) refers to reduced blood flow to the heart muscle, which can lead to heart muscle damage but is not specifically related to weakening and enlargement of the heart muscle as seen in cardiomyopathy.

Correct Answer: D

Rationale: The correct answer is D: Pleur. The pleura is a double-layered membrane that covers and protects the lungs. The outer layer is attached to the chest wall, while the inner layer covers the lungs. This membrane helps to reduce friction during breathing. Plaque (A) is a buildup of fatty deposits in arteries, not related to lung protection. The pancreas (B) is an organ that produces digestive enzymes and insulin, not a membrane covering the lungs. Lymph (C) is a fluid that circulates in the lymphatic system, not a membrane covering the lungs. Therefore, the correct answer is Pleur as it is directly related to the lung's protection and function.

Correct Answer: C

Rationale: The correct answer is C: Blurred vision. The first symptom of a cataract is usually blurred vision, as the clouding of the eye's lens affects the clarity of vision. Reduced side vision (A), vomiting (B), and double vision (D) are not typical initial symptoms of cataracts. Blurred vision is the most common and specific early sign, indicating the need for further evaluation and potential treatment for cataracts.

Correct Answer: D

Rationale: Immunotherapy is the correct answer because it uses antibodies or vaccines to boost the body's immune system to recognize and destroy cancer cells. This approach specifically targets cancer cells without harming normal cells. Radiation therapy (A) uses high-energy radiation to kill cancer cells, hormone therapy (B) blocks hormones that fuel cancer growth, and chemotherapy (C) uses drugs to kill cancer cells, but they do not directly involve antibodies or vaccines like immunotherapy.