The Human Body is composed of
Organs
- An ORGAN is a structure composed of at least two different tissue types that perform a specific function within the body. - Examples include the brain, stomach and liver. - Complex functions begin to emerge at this level TOGETHER THEY FORM ORGAN SYSTEMS
Cellular Level
- The cellular level is made up of the smallest unit of living matter, the cell. - Individual cells may have some common functions but vary widely in size and shape. - Each type of cells carries out a set of unique tasks within the human body. e.g. nerve cell. TOGETHER THEY FORM TISSUES
Chemical Level
- Tiny Building blocks of matter: Atoms, eg - Hydrogen combine to form molecules - Molecules: Two or more atoms combined. eg: Water, sugar, protein - In turn, molecules combine to form organelles, the internal organs of a cell. TOGETHER THEY FORM CELLS
Tissues
- Tissues are groups of similar cells that have a common function - A tissue must contain two different types of cells - The four basic tissue types in humans include; Epithelium, Connective, Muscle, and Nervous Tissue. TOGETHER THEY FORM ORGANS
The Cardiovascular System
Blood vessels transports blood carrying oxygen, Co2, Nitrogen, Nutrients and wastes
The Digestive system
Breaks food down into absorbable units that enter the blood to be distributed to cells, tissues, organs, glands. Wastes eliminated in feces.
The Urinary System
Eliminates Nitrogenous wastes from the body. Regulates water, electrolyte, acid-base balance of the blood.
The Nervous System
Fast Acting Control System. Electrical impulses sent to respond to internal and external changes.
The Respiratory System
Keeps blood constantly supplied with O2 and removes Co2: Gaseous Exchange
The Muscular system
Movement, Heat, Posture, Expression.
Organ system
One or more organs work in unison to accomplish a common purpose - For instance, the heart and blood vessels work together and circulate blood throughout the body to provide oxygen and nutrients to cells. TOGETHER THEY FORM AN ORGANISM
The Lymphatic System
Picks up fluid leaked from blood vessels and returns it to blood. Immune function. Houses white blood cells.
The Skeletal System
Protects and supports body organs. Provides a framework. Muscles attach to cause movement
The Reproductive System
Reproduction of offspring. Testes produce sperm and male sex hormones. Ovaries produces eggs and female sex hormones
Organism
The organism level is the highest level of organisation It is the sum total of all structural levels working together In short, it is the human being (or organism) as a whole