Corium is another name for -

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.

Correct Answer: A

Rationale: The correct answer is A: Stratum germinativum. This layer of stem cells constantly divides to renew the epidermis. The stratum germinativum is also known as the basal layer and is located at the bottom of the epidermis. It contains actively dividing cells responsible for producing new skin cells. The basal lamina (B) is a structure that separates the epidermis from the dermis but does not contain dividing stem cells. The stratum corneum (C) is the outermost layer of the epidermis composed of dead skin cells. The stratum granulosum (D) is a layer of the epidermis where cells begin to flatten and lose their nuclei, but it is not where active cell division occurs.

Correct Answer: B

Rationale: The correct answer is B: Areolar connective tissue. In the image, region '2' appears loose and has fibroblasts, collagen fibers, and elastic fibers, typical of areolar connective tissue. Areolar tissue is a loose connective tissue that provides support and elasticity. Rationale: 1. Areolar connective tissue is characterized by loose arrangement of cells and fibers, providing support and elasticity. 2. Presence of fibroblasts, collagen fibers, and elastic fibers in region '2' matches the characteristics of areolar connective tissue. 3. Areolar tissue is commonly found beneath the epithelial layers and around blood vessels and organs, supporting the body and connecting different tissues. Summary: A: Reticular connective tissue is more densely packed with reticular fibers and is found in organs like the spleen and lymph nodes. C: Stratified squamous epithelium is a type of epithelial tissue, which is not seen in region '2'.

Correct Answer: A

Rationale: Step-by-step rationale: 1. Melanin increases in concentration during sun exposure to protect the skin. 2. Option A is incorrect as melanin actually increases in concentration to protect against UV radiation. 3. Melanin is typically brown or black (B), released through melanosomes (C), and protects DNA from UV damage (D). 4. In summary, option A is the correct answer because melanin does not decrease in concentration during sun exposure; it increases to provide protection.

Correct Answer: D

Rationale: In thin skin, the epidermis contains 4 layers: stratum basale, spinosum, granulosum, and corneum. In thick skin, it contains an additional layer called stratum lucidum. Therefore, the correct answer is D. Option A is incorrect because thin skin has 4 layers. Option B is incorrect as thick skin has 5 layers. Option C is incorrect as thin skin has 4 layers and thick skin has 5 layers.