Nursing Elites

1. What is the membrane on the surface of a lung called?

• A. visceral pleura
• B. parietal pleura
• C. visceral pericardium
• D. parietal pericardium

Correct answer: A

Rationale: The correct answer is A: visceral pleura. The membrane covering the surface of the lungs is called the visceral pleura. It is a serous membrane that is in direct contact with the lung tissue. Choices B, C, and D are incorrect because the parietal pleura covers the inner surface of the chest wall and diaphragm, the visceral pericardium covers the surface of the heart, and the parietal pericardium is the outer layer of the pericardium surrounding the heart, respectively.

2. Signs of aging at the cellular level are

• A. graying hair, waning strength, and wrinkles.
• B. unrepaired DNA and abnormal proteins.
• C. impaired cell division and the ability to break down and recycle worn cell parts.
• D. a fatty liver and clogged blood vessels.

Correct answer: C

Rationale: The correct answer is 'impaired cell division and the ability to break down and recycle worn cell parts.' Aging at the cellular level involves reduced efficiency in cell division and the breakdown/recycling of cellular components, leading to functional decline. Choices A, B, and D are incorrect because they involve external physical manifestations or organ-specific issues rather than cellular-level changes associated with aging.

3. The organ systems responsible for integration and coordination are the nervous and endocrine systems.

• A. True
• B. False
• C. Not Sure
• D. None of the above

Correct answer: A

Rationale: The correct answer is True. The nervous and endocrine systems are indeed responsible for integration and coordination in the body. The nervous system uses electrical impulses to send signals quickly, while the endocrine system uses hormones to send chemical messages more slowly. Together, they work to regulate various bodily functions and maintain homeostasis. The other choices are incorrect as the statement accurately describes the roles of the nervous and endocrine systems in integration and coordination.

4. A parietal layer of a serous membrane lines cavities, whereas a visceral layer of a serous membrane covers organs.

• A. covers organs; lines cavities
• B. lines cavities; covers organs
• C. secretes serous fluid; secretes mucus
• D. secretes mucus; secretes a serous fluid

Correct answer: B

Rationale: In serous membranes, the parietal layer lines the cavities, providing support and protection, while the visceral layer covers the organs, reducing friction and allowing them to move freely. Therefore, the correct answer is 'lines cavities; covers organs.' Choices C and D are incorrect because serous membranes do not secrete mucus; instead, they secrete a watery serous fluid. Choice A is incorrect as it reverses the functions of the parietal and visceral layers in relation to organs and cavities.

5. Homeostasis exists if concentrations of water, nutrients, and oxygen in the body and heat and pressure __________.

• A. decrease steadily
• B. remain within certain limited ranges
• C. increase when the body is stressed
• D. fluctuate greatly between very high and low values

Correct answer: B

Rationale: Homeostasis is the body's ability to maintain stable internal conditions despite external changes. To achieve this balance, concentrations of essential substances must remain within specific ranges. Choice A is incorrect because decreasing concentrations would not maintain stability. Choice C is incorrect as increasing concentrations when the body is stressed would disrupt homeostasis. Choice D is incorrect as fluctuating greatly between high and low values would also not support the body's stability. Therefore, the correct answer is B, as it aligns with the concept of homeostasis by emphasizing the need for stability within certain limits.

Similar Questions