Nursing Elites

1. The microscopic functional unit of the kidney responsible for filtering blood is the:

• A. Ureter
• B. Nephron
• C. Renal pelvis
• D. Bladder

Correct answer: B

Rationale: The correct answer is B: Nephron. The nephron is the microscopic functional unit of the kidney responsible for filtering blood and producing urine. It consists of the glomerulus, Bowman's capsule, proximal convoluted tubule, loop of Henle, and distal convoluted tubule. The other options, A: Ureter, C: Renal pelvis, and D: Bladder, are incorrect as they are not parts of the nephron but rather other structures involved in the urinary system. The ureter is a tube that carries urine from the kidneys to the bladder, the renal pelvis is a funnel-shaped structure in the kidney that collects urine, and the bladder stores urine before it is excreted from the body.

2. Which property of a wave remains constant when the wave enters a different medium?

• A. Frequency
• B. Wavelength
• C. Amplitude
• D. Speed

Correct answer: d

Rationale: The speed of a wave remains constant when it enters a different medium, provided the conditions are unchanged.

3. The energy absorbed during a chemical reaction is called:

• A. Kinetic energy
• B. Potential energy
• C. Heat energy
• D. Endothermic energy

Correct answer: D

Rationale: Endothermic means "inward heat," indicating energy is absorbed during the reaction.

4. What is the relationship between the wavelength (λ) and frequency (f) of a wave with a constant speed (v)?

• A. λ = v / f
• B. λ = f / v
• C. λ = vf
• D. λ is independent of f and v

Correct answer: A

Rationale: The relationship between wavelength (λ), frequency (f), and speed (v) of a wave is given by the formula λ = v / f. This formula is derived from the wave equation v = fλ, where v is the speed of the wave, f is the frequency, and λ is the wavelength. By rearranging the equation, we get λ = v / f, indicating that the wavelength is inversely proportional to the frequency when the speed of the wave is constant.

5. Muscles that work in opposition to each other, producing opposing movements, are called:

• A. Synergists
• B. Antagonists
• C. Agonists
• D. Fixators

Correct answer: B

Rationale: The correct answer is B: 'Antagonists.' Antagonistic muscles are pairs of muscles that work in opposition to each other to produce opposing movements around a joint. For example, the biceps and triceps in the arm act as antagonists - when the biceps contract to bend the elbow, the triceps relax, and vice versa. Synergists (A) are muscles that work together to create a movement, agonists (C) are primary muscles responsible for generating movement, and fixators (D) are muscles that stabilize joints to allow other movements to occur. Understanding the roles of antagonistic muscles is crucial in biomechanics and exercise science.

6. What is the waxy or oily substance produced by sebaceous glands that helps lubricate the skin and hair?

• A. Keratin
• B. Melanin
• C. Sebum
• D. Sweat

Correct answer: C

Rationale: The correct answer is C: Sebum. Sebum is a waxy or oily substance produced by the sebaceous glands in the skin. It helps lubricate and waterproof the skin and hair, preventing them from drying out. Keratin is a protein found in the skin, hair, and nails, providing structure and strength. Melanin is a pigment that gives color to the skin, hair, and eyes. Sweat is produced by sweat glands and helps regulate body temperature by cooling the skin through evaporation. In this question, sebum specifically refers to the substance produced by sebaceous glands, making it the correct answer.

Similar Questions