Which of the following cells contain granules of keratohyaline protein in their cytoplasm-

Correct Answer: B

Rationale: The correct answer is B: Stratum granulosum. This layer of the epidermis contains granules of keratohyaline protein, which play a crucial role in the formation of keratin. Keratohyaline granules help bind keratin filaments together, leading to the development of a tough, protective barrier in the skin. A: Stratum malpighi is not the correct choice as it refers to the combination of the stratum basale and stratum spinosum layers of the epidermis, which do not contain keratohyaline granules. C: Stratum lucidum is not the correct choice as it is a thin, translucent layer found only in certain areas of the skin, such as the palms and soles, and does not contain keratohyaline granules. D: Stratum corneum is not the correct choice as it is the outermost layer of the epidermis composed of dead, ker

Correct Answer: A

Rationale: The correct answer is A: Epidermis. In rabbits, hairs and most glands are developed from the epidermis, the outermost layer of the skin. The epidermis contains specialized cells that differentiate into hair follicles and various glands. The dermis (choice B) is the layer beneath the epidermis, primarily consisting of connective tissue. The subcutaneous layer (choice C) is primarily made of fat cells and helps insulate the body. The reticular layer (choice D) is part of the dermis and provides structural support. Therefore, the epidermis is the correct choice as it is the primary source of hair and gland development in rabbits.

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.