Human Body-4

1. Involuntary muscle – a muscle that works or moves on its own.
2. Voluntary muscle – a muscle that can be controlled.
3. Joint – a place in the body where bones come together and movement can occur.
4. Ligament – A tough, flexible connecting tissue that attaches one bone to another bone at a joint.
5. Nerve – Cells along which messages are carried to and from the brain.
6. Organ – Groups of tissues working together.
7. Reflex – An involuntary response not controlled by the brain.
8. Medulla – The smallest part of the brain that controls many involuntary movements.
9. Cell – The smallest unti of an organism that carries out all activities of life.
10.Cerebellum – The part of the brain that smoothes and coordinates movement.
11.Cerebrum – The part of the brain that controls the ability to think, learn, and talk.
12. Sensory nerve – A nerve that receives messages from inside or outside the body and sends them to the brain by way of the spinal cord.
13. Skeleton – A hard structure that supports and protects an animal or human body.
14. Spinal cord – A thick, cordlike bundle of nerves along which messages travel to and from the brain.
15. Tendon – A tough, white band of connecting tissue that attaches skeletal muscle to bone.
16. Tissue – Different cells working together to do the same job.
17. Oxygen – A gas having no color, smell, or taste that human need to live.
18. Carbon dioxide – A gas made of carbon and oxygen having no color or smell. When we breathe out, we put carbon dioxide into the air.
19. Ventricle – Either of the two lower chamber of the heart that receive blood.