The part of dermis is mainly composed of

Correct Answer: A

Rationale: The dermis is mainly composed of fibrous connective tissue, which provides structural support and flexibility to the skin. This tissue contains collagen and elastin fibers, giving the skin its strength and elasticity. Nerve fibers and receptors are present in the dermis for sensation, but they are not the main component. Blood capillaries supply nutrients and oxygen to the skin, but they are not the primary composition of the dermis. Elastin proteins are important for elasticity, but they are a component within the fibrous connective tissue in the dermis. Therefore, choice A is correct as it accurately represents the main composition of the dermis.

Correct Answer: A

Rationale: The correct answer is A: End organs of Ruffini. These corpuscles are stimulated by hot temperatures due to their function as thermoreceptors. Ruffini corpuscles respond to sustained pressure and warmth, making them sensitive to hot temperatures. The other choices are incorrect because: B: Crases corpuscles respond to deep pressure. C: Bulb corpuscles, also known as Pacinian corpuscles, respond to deep pressure and vibration. D: Meissner's corpuscles respond to light touch and are located in the dermal papillae of hairless skin.

Correct Answer: D

Rationale: The correct answer is D: Acting as a receptor organ. Mammalian skin contains sensory receptors for touch, pressure, pain, temperature, and vibration. These receptors play a crucial role in detecting and responding to external stimuli, aiding in survival. Skin is not primarily meant for A: The removal of excess water, as this function is mainly carried out by the kidneys. Skin does not excrete urea, making B incorrect. Skin is not responsible for storage of food, making C an incorrect choice. Thus, the correct answer is D as skin primarily acts as a receptor organ for sensory perception.

Correct Answer: B

Rationale: The correct answer is B: Colostrum. Colostrum is the first milk produced by the mammary glands following childbirth. It is rich in antibodies, proteins, and nutrients, essential for the newborn's immune system and overall development. It is crucial for providing protection and nourishment to the newborn. Incorrect choices: A: Infant milk - Incorrect, as the milk produced immediately after childbirth is colostrum, not infant milk. C: Casein - Incorrect, as casein is a protein found in milk but not specifically related to the first milk produced after childbirth. D: None of these - Incorrect, as colostrum is the correct term for the first milk secreted after childbirth.

Correct Answer: B

Rationale: The correct answer is B: Dermatology. Dermatology is the branch of medicine that deals with the study of skin and its diseases. "Hypology" (Choice A) is not a recognized term related to skin study. "Tricology" (Choice C) is the study of hair and scalp, not skin. "Mastology" (Choice D) is the study of breast diseases, not skin. Therefore, the correct term for the study of skin is Dermatology.