BIOSC-139 Lecture Notes - Lecture 7: Loose Connective Tissue, Melanin, Subcutaneous Tissue
9 Sep 2020
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Document Summary
Richly supplied with blood vessels and nerves. Increase surface area for exchange of gases, nutrients, and wastes. Epidermal ridges (friction ridges) elevations of dermal ridges. Increase gripping ability of hands and feet. Deeper layer accounts for 80% of thickness of dermis. Deep creases in palms, wrists, soles, fingers, and toes. Blood vessels play important role in temperature regulation. Describe the structure and function of the hypodermis. Has different distribution in males and females. Describe the factors that contribute to skin color. Allows crimson color of blood to show through. Hair: a flexible strand made of dead cells filled with hard keratin. Root: the part embedded in the skin. Shaft:the part that projects above the skin surface. Medula: the central core that consists of large cells and air spaces. Cortex: surrounding the medulla, consists of several layers of flattened cells. Cuticle: a single layer of cells that overlap one another from below like shingles on a roof.
