Nursing Elites

1. Which types of molecules can move through a cell membrane by passive transport?

• A. Complex sugars
• B. Non-lipid soluble molecules
• C. Oxygen
• D. Molecules moving from areas of low concentration to areas of high concentration

Correct answer: C

Rationale: The correct answer is C: Oxygen. Small, non-polar molecules like oxygen can easily pass through the cell membrane by passive transport as they move down their concentration gradient without the need for energy input. Complex sugars (choice A) are typically too large to pass through the membrane by passive transport. Non-lipid soluble molecules (choice B) may require active transport mechanisms. Choice D describes active transport, where molecules move against their concentration gradient, requiring energy input.

2. Which of the following correctly lists the four properties that all types of muscle tissue share?

• A. Contractile, excitable, elastic, extensible
• B. Contractile, voluntary, elastic, extensible
• C. Contractile, excitable, voluntary, extensible
• D. Contractile, excitable, elastic, voluntary

Correct answer: A

Rationale: The correct answer is A: 'Contractile, excitable, elastic, extensible.' All types of muscle tissue share these four properties. Muscle tissue can contract, respond to stimuli, stretch and return to its original shape (elastic), and extend or stretch (extensible). Choice B is incorrect because not all muscle tissues are voluntary (some are involuntary). Choice C is incorrect because not all muscle tissues are voluntary. Choice D is incorrect because not all muscle tissues are voluntary and lack the elastic property.

3. Which of the following is a pair of nerves that originates from the brain?

• A. Spinal nerves
• B. Olfactory nerves
• C. Sciatic nerve
• D. Optic nerve

Correct answer: B

Rationale: The olfactory nerves, choice B, are a pair of cranial nerves that originate from the brain. They are responsible for the sense of smell and are the only cranial nerves that directly connect to the cerebrum. Spinal nerves, choice A, originate from the spinal cord, the sciatic nerve, choice C, is a large nerve that originates in the lower back, and the optic nerve, choice D, originates from the retina of the eye. Therefore, choices A, C, and D are incorrect as they do not originate directly from the brain.

4. What is the term for the shedding of the outermost layer of the epidermis?

• A. Desquamation
• B. Exfoliation
• C. Keratinization
• D. Epidermolysis

Correct answer: A

Rationale: Desquamation is the correct term for the shedding of the outermost layer of the epidermis. This process is essential for skin renewal, allowing the removal of dead skin cells from the skin's surface. Exfoliation, on the other hand, involves the removal of dead skin cells through mechanical or chemical methods. Keratinization refers to the process where skin cells produce the protein keratin, contributing to the skin's protective barrier. Epidermolysis is a condition characterized by the separation of the epidermis from the dermis due to a structural defect in the skin.

5. What are the three types of capillaries?

• A. Continuous, fenestrated, sinusoidal
• B. Continuous, discontinuous, fenestrated
• C. Sinusoidal, alveolar, continuous
• D. Continuous, fenestrated, vascular

Correct answer: A

Rationale: The correct answer is A: Continuous, fenestrated, sinusoidal. Capillaries are classified into three types based on their permeability: continuous (least permeable), fenestrated (moderately permeable), and sinusoidal (most permeable). Choices B, C, and D are incorrect because they do not represent the three main types of capillaries. Choice B includes 'discontinuous' which is not a recognized type. Choice C includes 'alveolar' which is not a type of capillary, and Choice D includes 'vascular' which is too broad and not specific to capillary classification.

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