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SCIENCE CHAPTER 24
Definitions
Term | Definition |
---|---|
Epidermis | A tissue that serves as a protective covering layer in plants; (24) the outer layer of tissue in humans and many animals. |
Dermis | The thick outer layer of the skin. |
subcutaneous layer | The layer of fat and connective tissues below the dermis of the skin. |
Melanin | A dark brown or black pigment. |
Callus | A area of skin w/ a thickened epidermis. |
Blister | A water-filled swelling of the epidermis of the skin. |
Bone marrow | A soft tissue that produce, blood cells; located in the marrow cavity of long bones and in the space of spongy bones. |
Ligament | A band of connective tissue that holds the bones of a joint in place. |
Tendon | The connective tissue that attaches muscle to bone. |
Bone | The strong supporting structure of vertebrates. |
Osteon | A microscopic unit of a bone consisting of a blood vessel and layers of hard nonliving material around it. |
Cartilage | A flexible supporting tissue that makes up part or all of some animals skeletons. |
Joint | The place where two or more bones meet. |
Voluntary muscle | A muscle that can be controlled at will. |
Skeletal muscle | Muscle tissue that attacks to and moves the skeleton. |
Striated muscle | Muscle tissue that displays a pattern of light and dark bands. |
Involuntary muscle | A muscle controlled automatically by thee brain; controlled w/out conscious effort. |
Smooth muscle | Muscle tissue that lacks striations; forms the walls of many internal organs. |
Cardiac muscle | A kind of striated involuntary muscle that is found in the heart. |