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Published byChristina Robertson Modified over 9 years ago
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Body Membranes & Skin: Integumentary System Chapter 4
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Body Membranes Function of body membranes – Cover body surfaces – Line body cavities – Form protective sheets around organs
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2 types of membranes Epithelial membranes – Cutaneous membranes – Mucous membranes – Serous membranes Connective tissue membranes – Synovial membranes
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Epithelial Membrane: Cutaneous membrane Skin – Epidermis- stratified squamous – Dermis- dense connective tissue
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Epithelial Membrane: Mucous membrane Lines all body cavities that are open to the outside of the body
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Epithelial Membrane: Serous membrane Lines body cavities that are closed to outside of body – Peritoneum- abdominal cavity, evolved from coelom – Pleura- around the lungs – Pericardium- around the heart
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Saggital section: peritoneum in green
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Connective tissue membrane: Synovial membrane Lines cavity between joints
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Integumentary System Skin (cutaneous membrane) Skin Derivatives – Sweat glands – Oil glands – Hair – Nails
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Skin Functions: – protection of deeper tissues from chemicals, bacteria, and drying. – Regulates body temp – makes vitamin D. – Contains sensory receptors.
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Skin Epidermis – stratified squamous epithelial tissue, no blood supply Dermis – dense connective tissue – blood vessels, nerves, skin appendages, produce fingerprints
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Skin Color Pigment= melanin Amount of melanin depends on genetics & exposure to sunlight
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Is a zebra black with white stripes or white with black stripes?
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Sebaceous Glands Produce oil – Keeps skin from drying out – Kills bacteria Acne is an infection of the sebaceous gland
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Sweat Glands Produce sweat that dumps into pores or hair follicles Sweat= water, salt, fatty acids, urea Acidic to kill bacteria Bacteria is what causes sweat odor
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Fun (Smelly) Fact The bacteria in your armpits are more closely related to the bacteria in your friend’s armpits than the bacteria in your own pubic area.
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Fun Fact On a hot day you can lose up to 7 liters of water X 7
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