If dead cells of stratum corneum (outer most layer) alive then the most harmful effect is likely to-

Correct Answer: A

Rationale: The correct answer is A because if dead cells of the stratum corneum are alive, it means the skin barrier is compromised, allowing bacteria to penetrate the skin and enter the body, leading to potential infections and health risks. Choice B is incorrect because the growth of hairs is unrelated to the status of the stratum corneum. Choice C is incorrect as the secretion of sweat is not directly affected by the condition of the stratum corneum. Choice D is incorrect because bacteria developing on the skin is a common occurrence, regardless of the state of the stratum corneum.

Correct Answer: A

Rationale: The correct answer is A: Mastology. The term "masto-" refers to breasts or mammary glands, making mastology the study of mammary glands. Stomatology (B) is the study of the mouth and its diseases, heptatology (C) is the study of the liver, and angiology (D) is the study of blood vessels. Therefore, A is the only choice that accurately represents the study of mammary glands.

Correct Answer: C

Rationale: The correct answer is C: Apocrine. Mammary glands secrete milk through the process of apocrine secretion, where the cell membrane buds off to release the secretory product. This is different from merocrine secretion (choice A) where the secretory product is released by exocytosis without any loss of cytoplasm, and holocrine secretion (choice B) where entire cells are released with their secretory product. Choice D is incorrect because mammary glands do indeed secrete milk through apocrine secretion.

Correct Answer: B

Rationale: The correct answer is B: Dermis. Leather is obtained from the dermis layer of animal skin, where the collagen fibers are tightly packed, providing strength and durability. The dermis contains the necessary components for tanning and processing into leather. Epidermis (A) is the outermost layer of the skin and does not contain the required collagen fibers. Adipose tissues (C) are responsible for fat storage and do not contribute to leather production. Collagen fibers (D) are present in the dermis, but the process of converting them into leather involves the entire dermal layer, not just the fibers alone.

Correct Answer: C

Rationale: The correct answer is C: Involuntary. Arrector pili muscles are small muscles attached to hair follicles that contract involuntarily in response to various stimuli like cold or fear. They cause hairs to stand on end, known as "goosebumps." Choice A is incorrect because arrector pili muscles are not under voluntary control. Choice B is incorrect because they are purely involuntary. Choice D is incorrect as the correct answer is C.