Question

match the following.
drag the terms on the left to the appropriate blanks on the right.
epidermal dendritic cell
subcutaneous tissue
stratum basale
keratinocyte
papillary layer of dermis
melanocyte
stratum corneum

1. cell responsible for alerting and activating an immune response to a bacterial or viral invasion
2. superficial layer of the epidermis made of 20 - 30 cell layers of dead, keratin - filled cells
3. upper layer of the dermis that forms dermal papillae
4. cell commonly found in the epidermis that produces keratin
5. hypodermis
6. cell that produces a pigment known as melanin
7. deepest layer of the epidermis that is situated closest to the dermis

Explanation:

1. Epidermal dendritic cells (also known as Langerhans cells) are part of the immune system. They detect pathogens (like bacteria or viruses) in the skin and alert the immune system.
2. The stratum corneum is the outermost layer of the epidermis. It consists of many layers of dead keratin - filled cells which provide a protective barrier.
3. The papillary layer of the dermis is the upper layer of the dermis. It forms dermal papillae which help in gripping (in hands and feet) and also contain blood vessels that nourish the epidermis.
4. Keratinocytes are the most common cells in the epidermis. Their main function is to produce keratin, a protein that gives strength and waterproofing properties to the skin.
5. The subcutaneous tissue is also called the hypodermis. It is a layer of tissue below the dermis and is involved in insulation, energy storage (as fat), and anchoring the skin to underlying structures.
6. Melanocytes are cells in the epidermis (usually in the stratum basale) that produce melanin. Melanin is a pigment that gives color to the skin and protects it from ultraviolet radiation.
7. The stratum basale is the deepest layer of the epidermis. It is adjacent to the dermis. Cells in this layer divide to produce new keratinocytes which then move up through the epidermal layers.

Answer:

1. Epidermal dendritic cell
2. Stratum corneum
3. Papillary layer of dermis
4. Keratinocyte
5. Subcutaneous tissue
6. Melanocyte
7. Stratum basale