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digest./excrete./ski
vocab. on body systems
| Question | Answer |
|---|---|
| epidermis | outer, thinnest layer of skin |
| dermis | below epidermis, contains blood vessels, nerves, ,muscles, oil, sweat glands, and other structures |
| melanin | pigment, protects skin, gives color to skin |
| digestion | process that breaks down food into smaller molecules |
| mechanical digestion | takes place when food is chewed, mixed, and churned |
| chemical digestion | occurs when chemical reactions breaks down large molecules |
| enzyme | type of protein that that speeds up the rate of chemical reaction in the body |
| peristalsis | waves of muscle contractions in digestive system |
| chyme | after being in stomach for 2 to 4 hours a thin-watery liquid is made |
| villi | finger-like projections in small intestines that help absorb food |
| urinary system | body system that rids blood of waste produced by cells |
| urine | wastewater |
| kidney | filters blood |
| nephron | tiny filtering units |
| ureter | tube from kidney to bladder |
| bladder | holds urine |
| urethra | carries urine from bladder to outside of body |