Cell The basic unit of structure and function

Cell The basic unit of structure and function in living things Cell Membrane The outside cell boundary that controls which substances can enter or leave the cell Nucleus The control center of a eukaryotic cell that directs cell activities and contains information that determines cell form and function Cytoplasm The material within a cell apart from the nucleus Tissue A group of similar cells that preform the same function

Muscle Tissue A body tissue that contracts or shortens making body parts move Connective Tissue Nervous Tissue Epithelial Tissue A body tissue that carries electrical messages back and forth between the brain and every other part of the body Organ A structure in the body that is composed of different kinds of tissue A body tissue that provides support for the body and connects all of its parts A body tissue that covers the surfaces of the body inside and out

Organ System A group of organs that work together to perform a major function in the body Homeostasis The maintenance of stable internal conditions in an organism Stress The reaction of a person’s body to potentially threatening, changing or disturbing events Skeleton The inner framework made of all the bones of the body Vertebrae The small bones that make up the backbone

Joint A place in the body where two bones come together Ligament Strong connective tissue that holds bones together in moveable joints Cartilage A connective tissue that is more flexible than bone and that protects the ends of bones keeping them from rubbing together Compact Bone Hard dense bone tissue that is beneath the outer membrane of a bone Spongy Bone Layer of bone tissue having many small spaces and found just inside the layer of compact bone

Marrow The soft connective tissue that fills the internal space in bone Osteoporosis A condition in which the body’s bones become weak and break easily Involuntary Muscle Voluntary Muscle Skeletal Muscle A muscle that is not under conscious control A muscle that is attached to the bones of a skeleton and provides the force that moves the bones

Tendon Strong connective tissue that attaches muscle to bone Striated Muscle Smooth Muscle Cardiac Muscle Involuntary muscle found inside many organs of the body Epidermis The outer layer of the skin A muscle that appears banded also called skeletal muscle Muscle tissue found only inside of the heart

Melanin A pigment that gives the skin its color Dermis The inner layer of the skin Pore A opening through which sweat reaches the surface of the skin Follicle Structure in the dermis of the skin from which a strand of hair grows Cancer A disease in which some body cells divide uncontrollably