What is a function of the male reproductive system?

Correct Answer: A

Rationale: The correct answer is A because the male reproductive system's primary function is to produce testosterone, a hormone responsible for male characteristics and sperm production. Testosterone is produced in the testes by Leydig cells. Choices B, C, and D are incorrect because progesterone is produced by the female ovaries, ova are produced by the female reproductive system, and estrogen is the primary female sex hormone.

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.

Correct Answer: D

Rationale: The correct answer is D (6) because performing range of motion exercises at least 6 times for each joint helps improve joint flexibility and prevent stiffness. This frequency strikes a balance between providing enough stimulus for the joints to maintain their range of motion without overexerting them. Option A (9) is excessive and may lead to joint strain. Option B (5) and Option C (3) may not provide enough stimulus to effectively improve joint flexibility.