Anatomy

Anatomy - It is the study of the structures/systems of the human body

Human body organisation 

All living and non-living things are made of one or more component called elements. The smallest unit of which is the atom.

 Atoms combine to form molecules.

 Molecules can be small, medium   or large. Molecules are the building blocks to all structures in the human body.

All living structures are made of cells, which are made of many different molecules. Cells are the smallest functional unit of living thing in the human body. The body is made of many different cell types, each with a particular function for example muscle cells contract to perform particular action or red blood cells carry oxygen.

 All human cells are made of a cell membrane (thin outer layer) that encloses a jelly-like cellular fluid containing tiny organ. Cells in the human body are organized into tissues. 

A tissue is a group of similar cells that work together to perform a specific function. There are four main tissue types in humans (muscular, epithelial, nervous and connective). 

An organ is an identifiable structure of the body composed of two or more tissues types. Organs often perform a specific physiological function (for example, the stomach helps digest food). 

An organ system is a group of organs that work together to perform a specific function (for example, the stomach, small and large intestines are all organs of the digestive system, that work together to digest foodstuff, move nutrients into the blood and get rid of waste). 

The most complex level of organization, the human organism is composed of many organ systems that work together to perform the functions of an independent individual.

Systems of Human Body

1) Skeletal System 2) Cardiovascular system 3) Respiratory system

4) Muscular System 5) Nervous system 6)Endocrine (hormonal) system 7) Integumentary system 8) Immune system 

9) Gastro-intestinal (Digestive) system 10) Reproductive system

11) Urinary (Excretory) system