bio 201 sept 25 notes
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- KNOW stratum basale = actively dividing stem cells
- - stem cells undergo cell division, to produce new kerainocytes
- cells responsible for touch
- Merkle cells
- 3 muscles
- skeletal, cardiac, elastic
- papillary & reticular layers
- = dense irregular & loose connective
- where are eccrine glands found? what products are secreted?
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palms of hands, soles of feet
- water, sale, nitrogen waste - lamellar granules
- release lipid-rich, water-repellent secretion
- keratohyalin
-
strong tough fibrous protein called keratin
-these are flattened cells, where organelles are begining to degenerate - Where are apocrine glands found ___ what does it secrete?
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armpit, analgenital,
-more milky, not watery (stinkier ) - what do sebaceous glands produce?
- oil, contributes to keeping hair moist
- 4 sensory receptors
- Merkle, free nerve endings, Meissner corpuscles, Pacinian corpuscles
- ceruminous glands
- -produces ear wax, found in external ears
- Reticular Region consists of what type of tissue?
- dense irregular tissue (containing fibroblasts, collagen, &coarse elastic fibers) Between fibers are adipose, hair follicles, neves, sebaaceous glands & sudoriferous glands. So it's a combinatio nof collagen & elastic fbers, gives skin strenght, extensibility & elasticity
- nail matrix
- -where mitosis occurs
- hair matrix
- -where mitosis occurs