Mammary glands are -

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: 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.

Correct Answer: C

Rationale: The correct answer is C: Less sweat in cold weather. During cold weather, the body's sweat glands produce less sweat as a way to conserve heat. This decrease in sweat production leads to less moisture on the skin, causing it to become dry. Vasodilation (choice A) is the widening of blood vessels, which can actually lead to increased moisture on the skin. Vasoconstriction (choice B) is the narrowing of blood vessels, which can affect blood flow but not directly contribute to dry skin. Choice D is incorrect as less sweat production in cold weather is the primary reason for dry skin.

Correct Answer: C

Rationale: The correct answer is C: Nerves. Nails do not contain nerves, which are responsible for transmitting pain signals to the brain. Without nerves, the sensation of pain cannot be felt when cutting the nails. Blood vessels (choice A) and bones (choice B) are not directly related to the sensation of pain in this scenario. Choice D is incorrect as nails do not contain any of these structures that would transmit pain. In summary, the absence of nerves in nails is the reason why we do not feel pain when cutting them.

Correct Answer: A

Rationale: The correct answer is A: Dermis. Corium is another name for the dermis, the layer of skin beneath the epidermis. The dermis contains blood vessels, nerves, hair follicles, and sweat glands. The epidermis is the outermost layer of skin and is primarily composed of dead skin cells. Choice B (Epidermis) is incorrect because corium does not refer to the epidermis. Choice C (Both (1) and (2)) is incorrect because corium specifically refers to the dermis only. Choice D (None) is incorrect as corium is indeed another term for the dermis.