HUMAN BODY
Although we all look different, we are identical in the way our bodies are constructed and function. Each human body is built up from 12 major systems, including the digestive system, skeletal system, and muscular system. These systems interact to produce co-ordinated, active, intelligent humans. The study of the body’s structure is called anatomy. Externally, the only consistent anatomical differences between humans are between males and females.
From cells to systems
The body’s billions of cells are organized into tissues. Each tissue consists of similar types of cell. One or more types of tissue work together inside an organ, such as a bone or a lung. Organs are linked together to form a system that has one or more major roles. Together the systems are collected together to form the body.
Cell
Osteocyres, or bone cells, are spider-shaped cells that make up the tissues that form a bone. Osteocytes are found in spaces called lacunae that are scattered about the hard matrix (material) found in bone tissue. Their job is to maintain the hard matrix.
Tissue
Compact bone is one of the tissues that make up a bone. It consists of layers of hard bone around a central tube called the Heversion canal. This carries blood vessels which supply the osteocytes which food and oxygen.
Organ
Each bone consists of different tissues. Compact bone is a bone’s hard outer covering. Spongy bone and bone marrow are tissues found inside bones. Cartilage is the slippery tissue found in joints.
Skeleton
The adult skeletal system is made up of 206 bones. The skeleton provides a framework that support the body protects internal organs and provides attachment points for muscles.
Body
The skeleton and the other major body systems leaving human body. The body’s systems do not work in isolation, however. For example, the skeleton is supplied with blood vessels, Lymph vessels, and nerves, and requires muscles to move it.
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