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Concept explainers
Introduction:
The hair is present in every part of the human body except the lips, palm, the nipple, etc. the color and the structure of hair may vary due to age. In the sixth month of fetal development, the hair is very delicate and is termed as lanugo, during the birth time the baby has pigmented hairs which are termed as terminal hairs. The lanugo hair is replaced by the vellus hairs which get replaced during puberty. The growth of hairs consists of growth and resting phases. In the growth phase, the hair will grow in length due to the production of new cell matrix to get keratinized and die, after this the hair growth enters the resting phase the old hairs will be changed by new hairs that cause hair fall, therefore hair fall is normal.
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Chapter 5 Solutions
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- Epidermal cells synthesize a substance that prevents damage from the atmosphere’s oxygen. This substance is calledarrow_forwardWhich of the following phenomena involve dermal plasticity? (can be more then one) Group of answer choices release of Cuvierian tubules casting off arms (autotomy) extension of podia eviscerationarrow_forwardWhich of the following phenomena involve dermal plasticity? release of Cuvierian tubules casting off arms (autotomy) evisceration extension of podiaarrow_forward
- Describe the growth, distribution, and replacement of hairsarrow_forwardEpidermal cells that aid in the immune response include: Melanocytes Dendritic cells Spiny cells Tactile cellsarrow_forwardWhat do hair, fingernails, and the stratum corneum all have in common? Select ALL answers that are correct. They are dead They grow in 2-7 year cycles They contain keratin They contain collagen fibersarrow_forward
- Which has more stomata, the upper or lower epidermis? Why?arrow_forwardMany antiaging skin creams contain collagen and hyaluronic acid. Manufacturers claim that the collagen and hyaluronic acid applied to the surface of the skin will be absorbed into the dermis, where they will be incorporated into dermal tissue?arrow_forwardCollagen fibers in the dermis provide ____________ while elastic fibers provide ______________. Group of answer choices insulation, strength netlike structure, durability strength, stretch thermoregulation, stretcharrow_forward
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