A stool sample that is to be tested for ______ must be delivered to the lab immediately.

Correct Answer: D

Rationale: The correct answer is D: Ova and parasites. Stool samples for ova and parasites testing must be delivered immediately to prevent the degradation of the specimens, ensuring accurate results. Ova and parasites can deteriorate quickly in the stool, affecting the validity of the test. Blood (A), constipation (B), and mucus (C) do not require immediate delivery to the lab as they are more stable and can be tested accurately even if the sample is not delivered immediately.

Correct Answer: B

Rationale: The correct answer is B: Aorta. The left ventricle pumps oxygen-rich blood into the aorta, which is the main artery that carries blood away from the heart to the rest of the body. This is a crucial step in the systemic circulation of the circulatory system. The aorta then branches out into smaller arteries, leading to the capillaries where gas exchange occurs. Explanation for Incorrect Choices: A: Right ventricle - The right ventricle pumps deoxygenated blood to the lungs, not oxygen-rich blood. C: Capillaries - Capillaries are tiny blood vessels where gas exchange occurs, but blood is not pumped directly from the left ventricle to capillaries. D: Veins - Veins carry blood back to the heart, but they do not receive blood directly from the left ventricle.

Correct Answer: B

Rationale: The correct answer is B: Lending support to body structures. Bones provide structural support for the body, helping maintain posture and protect internal organs. They also serve as attachment points for muscles, allowing movement. Choices A, C, and D are incorrect. Bones do not protect the body from disease (A), send messages throughout the body (C), or pump blood (D). Bones are not involved in immune responses, nervous system communication, or cardiovascular functions.

Correct Answer: B

Rationale: The correct answer is B: Paraplegia. Paraplegia specifically refers to the loss of function of the lower body and legs. "Para" means alongside, indicating paralysis affecting both legs. Concussion (A) is a head injury affecting cognitive function, not related to lower body paralysis. Quadriplegia (C) involves paralysis of all four limbs, not just the lower body. Hemiplegia (D) is paralysis affecting one side of the body, not limited to the lower body. Thus, paraplegia is the most appropriate term for the loss of function in the lower body and legs.

Correct Answer: A

Rationale: Rationale for choice A being correct: As women age, hormone levels decrease, leading to menopause. This is a normal age-related change due to the decline in estrogen and progesterone production by the ovaries. Menopause typically occurs around the age of 45-55. Summary of why other choices are incorrect: B: Testosterone levels in males actually decrease with age, leading to symptoms like decreased muscle mass and libido. C: Insulin production may decrease or remain stable with age, but it does not typically increase as a normal age-related change. D: While the body's ability to handle stress may change with age, it does not necessarily improve as a normal age-related change.