Nokea
What does the ceruminous gland secrete?
- A. Ear wax
- B. Keratin
- C. Mucus
- D. Oily sebum
Correct Answer: A
Rationale: The ceruminous gland, located in the ear canal, secretes ear wax, also known as cerumen. Ear wax plays a crucial role in protecting the ear canal by trapping dust and other particles, preventing them from reaching the delicate eardrum. Additionally, ear wax possesses antibacterial properties that aid in safeguarding the ear from potential infections. Therefore, the correct answer is A: Ear wax.
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What is the response of cells in the collecting tubules in the nephrons when antidiuretic hormone (ADH) is secreted?
- A. Serum potassium retention increases.
- B. Large quantities of dilute urine are formed.
- C. Water is reabsorbed from the urinary filtrate.
- D. The tubules become impermeable to water.
Correct Answer: C
Rationale:
Which organ is part of the male reproductive system and urinary system?
- A. Epidermis
- B. Ureter
- C. Testis
- D. Urethra
Correct Answer: D
Rationale: The correct answer is D: Urethra. The urethra is a part of both the male reproductive system, as it serves as the duct for semen during ejaculation, and the urinary system, as it allows the passage of urine from the bladder to outside the body. The epidermis is the outermost layer of the skin, the ureter is a tube that carries urine from the kidneys to the bladder, and the testis is a male reproductive organ responsible for producing sperm.
Which structure is found in the upper respiratory tract?
- A. Bronchi.
- B. Alveoli
- C. Pharynx.
- D. Lungs.
Correct Answer: C
Rationale:
What is the name of the outermost layer of the skin?
- A. dermis
- B. epidermis
- C. subcutaneous tissue
- D. hypodermis
Correct Answer: B
Rationale: The correct answer is B, 'epidermis.' The epidermis is the outermost layer of the skin, providing a protective barrier against environmental factors and regulating water loss. The dermis is located beneath the epidermis and contains important structures like blood vessels and glands. Subcutaneous tissue, also known as the hypodermis, is located below the dermis and serves functions such as insulation and energy storage.
Which heart chamber has the thickest wall?
- A. Right atrium
- B. Left atrium
- C. Right ventricle
- D. Left ventricle
Correct Answer: D
Rationale: The left ventricle has the thickest wall of all the heart chambers because it needs to pump oxygenated blood to the entire body. Its muscular wall is thicker and more powerful compared to the other heart chambers. The right atrium receives deoxygenated blood from the body, the left atrium receives oxygenated blood from the lungs, the right ventricle pumps deoxygenated blood to the lungs, while the left ventricle pumps oxygenated blood to the body. Due to the higher workload and pressure required to push blood to the entire body, the left ventricle is the most muscular and has the thickest wall.