| A | B |
|---|
| taste buds | receptors on the tongue |
| heart | hardest working muscle |
| ear drum | thin piece of skin in ear that vibrates when touched by sound waves |
| voluntary muscles | muscles that you can stop and start |
| calcium | mineral needed for strong bones |
| nerve sensors | give us a sense of touch |
| skin | largest organ in body |
| bones | provide shape and protection |
| over 600 | muscles in body |
| opens | iris does this when it's dark |
| sense organs | skin, eyes, nose, ears, tongue |
| retina | curved back of eye |
| olfactory | nerves in the nose |
| vibrations | sound begins with |
| cornea | transparent window at front of eye |
| iris | a ring of muscles in the eye that gives it color |
| closes down | iris does this when it's bright |
| involuntary | muscles over which you have no control |
| sweet | taste buds in front of tongue |
| bitter | taste buds in back of tongue |
| sweet & sour | taste buds on sides of tongue |
| 206 | bones in body |
| long bones | arms & legs |
| short bones | wrists & ankles |
| flat bones | ribs & skull |
| irregular bones | bones in the spine |
| lens | helps eye to focus |
| spongy | inside of bones |
| 5 types of skin sensors | pain, touch, heat, cold, pressure |
| outer ear | sound waves are collected here |
| water, protein & minerals | make up of bones |
| cochlea | inner ear |
