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 need to be delivered to the lab immediately because these organisms can deteriorate quickly outside the body, affecting the accuracy of the results. Ova and parasites are living organisms that can multiply or die off rapidly, so a timely delivery is crucial. Blood, constipation, and mucus do not require immediate delivery to the lab as they are more stable and do not degrade as quickly as ova and parasites.

Correct Answer: B

Rationale: The correct answer is B: Aorta. The left ventricle pumps oxygen-rich blood into the aorta, which is the largest artery in the body and carries oxygenated blood to the rest of the body. This is a crucial step in the systemic circulation process. The other choices are incorrect because: 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 between blood and tissues, not a site where blood is pumped. D: Veins - Veins carry blood back to the heart, with oxygen-poor blood returning to the right atrium, not the left ventricle.

Correct Answer: B

Rationale: The correct answer is B: Lending support to body structures. Bones provide structural support for the body, protect vital organs, and allow for movement. They also serve as storage for minerals and production of blood cells. Protecting the body from disease (A) is mainly the function of the immune system. Sending messages throughout the human body (C) is the role of the nervous system. Pumping blood throughout the body (D) is the function of the heart and circulatory system.

Correct Answer: B

Rationale: Paraplegia is the loss of function of the lower body and legs. "Para" means alongside or beside, indicating the lower part of the body. The other choices, A: Concussion, C: Quadriplegia, and D: Hemiplegia, do not specifically refer to the loss of function in the lower body and legs. Concussion is a head injury, Quadriplegia affects all four limbs, and Hemiplegia affects one side of the body.

Correct Answer: A

Rationale: The correct answer is A because normal age-related changes in the endocrine system often involve a decrease in hormone levels, such as estrogen signaling menopause in women. This is a typical physiological process in aging females. Testosterone levels do not typically increase in males with age, making choice B incorrect. Insulin production may decrease or remain stable with age, but it does not typically increase, so choice C is incorrect. Lastly, the body's ability to handle stress usually decreases with age due to changes in hormone levels and other factors, making choice D incorrect.