Makes blood cells.
Bones to help you move. These are your voluntary muscles.
Control the movement of your internal organs and blood vessels. This is involuntary.
A muscle found only in the heart. It controls how the blood is pumped throughout your body. It is involuntary.
The process of skin cells hardening so that they form your hair, nails, and the outer layer of your skin.
the sum total of all bones in the body
All creatures with a vertebral column backbone.
The portion of the skeleton that supports and protects the head, neck, and trunk.
The portion of the skeleton that attaches to the axial skeleton and has the limbs attached to it.
Organisms from kingdom Animalia with no backbone.
A body covering, typically made of chitin, that provides support and protection.
Animals with exoskeletons, such as grasshoppers and crawdads.
connective tissue that attaches the skeletal muscles to the skeleton.
A tough, flexible substance that allows joints to rub up against each other without damage.
Holds bones together in a joint.
Lubricates the joints so that their motion is smooth and easy.
Muscles that cause involuntary movement, which is movement made without conscious thought.
The tendency of plants to grow so that they face the light.
The tendency for a plant to sense which way is "up" and to grow that way.
Outer layer of skin
The inner layer below the epidermis
Below the dermis and composed mostly of fat. It is not technically considered part of the skin
A close relationship between two or more species where at least one benefits.
A protein found in bones that makes bones flexible.
Rigid, hard chemicals in bones. Calcium is usually one of these minerals.