The receptors for touch present in mammalian skin are known as -

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Integumentary System Exam Questions Questions

Question 1 of 5

The receptors for touch present in mammalian skin are known as -

Correct Answer: B

Rationale: The correct answer is B: Meissner's corpuscles. Meissner's corpuscles are responsible for detecting light touch and low-frequency vibration. They are located in the upper dermis and have rapidly adapting receptors, making them sensitive to changes in stimuli. Pacinian corpuscles (A) detect deep pressure and high-frequency vibration, Krause's bulbs (C) detect cold temperatures, and Corpuscles of Ruffini (D) detect skin stretching and continuous pressure. Meissner's corpuscles specifically match the description of touch receptors in mammalian skin, making it the correct choice.

Question 2 of 5

Which organ of the body is known as 'Jack of all trades' -

Correct Answer: C

Rationale: The correct answer is C: Skin. The skin is known as the 'Jack of all trades' because it performs multiple functions such as protection, regulation of body temperature, sensation, and synthesis of Vitamin D. It acts as a barrier against pathogens and harmful substances, regulates body temperature through sweat production, contains sensory receptors for touch, pressure, and pain, and plays a role in the synthesis of Vitamin D when exposed to sunlight. Rationale for other choices: A: Kidney - While the kidney plays a crucial role in filtering waste and maintaining electrolyte balance, it doesn't perform as wide a range of functions as the skin. B: Brain - The brain is the control center of the body, responsible for processing information, coordinating movements, and regulating bodily functions. However, it doesn't have the same versatility in functions as the skin. D: All of the above - This choice is incorrect because not all organs mentioned (kidney, brain) are known as the 'Jack of all

Question 3 of 5

The following are stages in the regeneration of skin following an injury: blood clot/scab formation, calcium injection, epidermis covers granulation tissue, epidermis covers scar tissue. The correct order for these events is:

Correct Answer: C

Rationale: The correct order for the stages in skin regeneration following an injury is: 1) Blood clot/scab formation, 2) Epidermis covers granulation tissue, 3) Epidermis covers scar tissue, and 4) Calcium injection. Rationale: 1) Blood clot/scab formation occurs first to stop bleeding and prevent infection. 2) Epidermis covering granulation tissue signifies the growth of new tissue. 3) Epidermis covering scar tissue indicates the completion of tissue repair. 4) Calcium injection is not a typical stage in skin regeneration; it does not play a direct role in the natural healing process. Summary: Choice A is incorrect as it starts with covering scar tissue, which is a later stage. Choice B is incorrect as it introduces calcium injection, which is not a standard stage. Choice D is incorrect as it places calcium injection before blood clot formation, which is inaccurate.

Question 4 of 5

The protein that reduces water loss at the skin surface is

Correct Answer: B

Rationale: The correct answer is B: Keratin. Keratin is a structural protein found in the skin that forms a protective barrier to reduce water loss. It is abundant in the outermost layer of the skin, the epidermis, helping to prevent dehydration. A: Keratin is the same as the correct answer, so it is not the correct choice. C: Melanin is a pigment that gives color to the skin and provides some protection against UV radiation, but it does not directly reduce water loss. D: Eleidin is a precursor to keratin in the skin, but it is not the protein responsible for reducing water loss.

Question 5 of 5

The keratinocytes are tightly connected with each other by

Correct Answer: B

Rationale: The correct answer is B: desmosomes. Desmosomes are specialized cell junctions that firmly attach keratinocytes together in the epidermis. Desmosomes provide mechanical strength and stability to the epidermis by forming strong connections between adjacent cells. Elastic fibers (choice A) provide elasticity to tissues but are not involved in cell-to-cell connections. Keratin (choice C) is a fibrous protein that forms the structural basis of keratinocytes but does not directly connect them. Prekeratin (choice D) is a precursor to keratin and is not involved in cell-cell adhesion.

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