Integumentary System I. Skin the largest ____________. – Also… nails, hair, glands, sensory receptors. Functions: 1. 2. 3. 4. 5. 6. Three layers Epidermis Dermis – Subcutaneous layer II. Epidermis 1. Stratum corneum layers of flat dead cells filled with – 2. Stratum lucidum layers of flat, dead cells found in – 3. Stratum granulosum - Cells die here, all organelles disintegrate, lipids diffuse out water proofing the skin. Keratin molecules develop forming a tightly packed layer. 4. Stratum spinosum live ____________ cells – (The cytoplasm shrinks during slide preparation leaving cytoskeleton and desmosomes causing cells to look like miniature porcupines. But hard to see) 5. Stratum basale - the ____________, single of cells. The stratum basale and stratum spinosum layers together are called the Cell Types: Keratinocytes - most _______________ skin cell that is found in all layers of the skin. It has fibrous keratin molecules that and intertwine around each other to form intermediate filaments of the cytoskeleton. Melanocytes _______________ producing, found in the stratum basale – Tactile cells (Merkel cells) Sensitive to _______________, found in the stratum basale – Dendritic cells Helps fight _______________ from pathogens that happen to get into the epidermis – Corneocytes keratinocytes in the stratum corneum that are dead, tightly packed, and ____________. – How long does it take for your skin to replace itself? ____________________
Integumentary System I. Skin – the largest ____________. Also… nails, hair, glands, sensory receptors. Functions: 1. 2. 3. 4. 5. 6. Three layers Epidermis Dermis – Subcutaneous layer II. Epidermis 1. Stratum corneum – layers of flat dead cells filled with 2. Stratum lucidum – layers of flat, dead cells found in 3. Stratum granulosum - Cells die here, all organelles disintegrate, lipids diffuse out water proofing the skin. Keratin molecules develop forming a tightly packed layer. 4. Stratum spinosum – live ____________ cells (The cytoplasm shrinks during slide preparation leaving cytoskeleton and desmosomes causing cells to look like miniature porcupines. But hard to see) 5. Stratum basale - the ____________, single of cells. The stratum basale and stratum spinosum layers together are called the Cell Types: Keratinocytes - most _______________ skin cell that is found in all layers of the skin. It has fibrous keratin molecules that and intertwine around each other to form intermediate filaments of the cytoskeleton. Melanocytes – _______________ producing, found in the stratum basale Tactile cells (Merkel cells) – Sensitive to _______________, found in the stratum basale Dendritic cells – Helps fight _______________ from pathogens that happen to get into the epidermis Corneocytes – keratinocytes in the stratum corneum that are dead, tightly packed, and ____________. How long does it take for your skin to replace itself? ____________________
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