body systems

consists of the skeletal system (bones and joints) and the skeletal muscle system (voluntary or striated muscle). Working together, these two systems protect the internal organs, maintain posture, produce blood cells, store minerals and enable the body to move

consists of the bones and joints

voluntary or striated muscle

the bones or shell of an animal that support and protect it as well as allowing movement

the pieces of hard tissue that make up the skeleton of a vertebrate

a substance inside bones in which blood cells are made

a waxy, whitish, flexible substance that lines or connects bone joints or, in some animals such as sharks, replaces bone as the supporting skeletal tissue. The ears and tips of noses of people are shaped by cartilage.

an element occurring in limestone, chalk, also present in vertebrates and other animals as a component of bone, shell etc. It is necessary for nerve conduction, heartbeat, muscle contraction and many other physiological functions.

a substance that plays an important role in almost every chemical reaction in the body. Together with calcium, it is required by the body to maintain healthy bones and teeth.

any of the inorganic elements that are essential to the functioning of the human body and are obtained from foods

hardening of bones

breaks easily into many pieces

region where two bones meet

band of tough tissue that connects the ends of bones or keeps an organ in place

the liquid inside the cavity surrounding a joint that helps bones to slide freely over each other

joint that allows a twisting movement

joints in which two bones are connected so that movement occurs in one plane only

joints where the rounded end of one bone fits into the hollow end of another

joints that allow no movement except when absorbing a hard blow

tissue consisting of cells that can shorten

muscles not under the control of the will; they contract slowly and rhythmically. These muscles are at work in the heart, intestines and lungs.

muscle attached to bones; it moves the bones by contracting and is controlled by an animal’s thoughts

tough rope-like tissue connecting a muscle to a bone

a break that is not completely through the bone, often seen in children