A&P 2 University Of Memphis -A&P Exam 2 Review questions with verified solutions

A&P 2 University Of Memphis -A&P Exam 2 Review questions with verified solutionsLayers of Epidermis - correct answer 4 Cell Types of Epidermis - correct answer 1. *Keratinocytes* - produce fibrous protein keratin 2. *Melanocytes* - produce melanin to protect against UV rays/determines skin pigment 3. *Dendritic (Langerhans) cells* - immune cells from white blood cell line 4. *Tactile (Merkel) cells* - "Merkels disc" nerve cells in stratum basale Function of Stratum Basale (Basal Layer) - correct answer -deepest epidermal layer -single row of stem cells -actively mitotic -produces 2 daughter cells, one travels to surface (takes 25-45 days) -10-25% of layer are melanocytes Function of Stratum Spinosum (Prickly Layer) - correct answer -contains web-like system of intermediate prekeratin filaments attached/pulling to desmosomes -abundant melanosomes and dendritic cells -get flatter with age -several layers thick Function of Stratum Granulosum (Granular Layer) - correct answer -*where keratinization begins* (water proof layer of skin) -cells flatten in this layer -thin, 4-6 layers -cells above this layer die Function of Stratum Lucidum (Clear Layer) - correct answer -only in thick skin