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