Week 12 Anatomy control systems
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| Largest organ of the body | Skin 8-12 pounds
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| Functions of the skin | protection,, prevent dehydration, heat regulation, sensation, makes vitamin D
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| Epidermis | most superficial layer of skin
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| epidermis vascular/avascular? | avascular
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| 4 layers of epidermis | stratum corneum, lucidim, spinosim, basale/germanativim
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| merkel cell | touch receptor
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| melanocyte | produces melanin
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| Langerhans cell | immune cell
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| Keratonicyutes | produce keratin to harden cells and make them waterproof
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| Dermis | 2nd layer of skin
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| sudoriferous glands | sweat glands contained in the dermis
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| sebaceous glands | oil glands found in dermis
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| dermis is vascular? | true
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| meisner corpuscle | touch receptor
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| arrector pilli | smooth muscle that raises hair on skin
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| Subcutaneous layer | also called hypodermis, superficial fascia
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| Subcutaneous layer contains... | adapose & connective tissue
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| Orbit | bones that protect the eyeball
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| Bones that makes up the roof of the orbit | frontal
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| Bone that makes up the medial portion of the orbit | ethmoid
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| Bone that makes up the lateral portion of the orbit | zygomatic
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| bone that makes up the floor of the orbit | maxilla
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| portion of the eyeball that is exposed | 1/6
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| Palpabrie | eyebrows
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| conjunctiva | membrane that lines the eyes and runs over the surface of the eyeball
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| Eyelashes | traps dust & dirt & protects eyes
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| lacrimal apparatus | makes & drains tears
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| lacrimal fluid | tears
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| 3 layers of the eyeball | fibrous, vascular, retina
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| sclera | white of eye, protects and shapes
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| cornea | avascular layer covered by conjunctiva
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| choroids | dense pigment that absorbs light and prevents reflection of light in back of eyeball
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| cilliary body | makes aqueous humor
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| Aqueous humor | flows just behind cornea, replaced every 90 minutes
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| Glaucoma | too much aqueous humor
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| Iris | colored part of eye that contains pupil & regulates the diameter of the pupil
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| Retina | innerportion of the eye containing specialized nerve cells for vision
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| cones | photo receptors for color and bright light
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| rods | photo receptors responsible for B& W vision & dim light
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| Optic disc | contains no rods & cones - blind spot
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| Lens | behind iris & pupil, focuses light rays on back of retina
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| accomodation | the lense changing shape
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| vitreous humor | thick gel-like fluid that fills the posterior chamber, not replaced
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