Top7 Level Of Organization BBCCT 115

 Top7 level of organization

1. Atomic Level: 

All living organisms and non living things are made up of small substances called element, the smaller unit of which is the atom. These are major element such as carbon (C), hydrogen (H), nitrogen (N),oxygen (O), phosphorus (p) etc.; and trace element i.e.. sodium (Na) and calcium (Ca) etc. these are present in the specific composition in the body of an organism than the non- living matter of environment.

2. Molecular Level

Two or more atoms make molecules, such as one oxygen and two hydrogens make water molecules (H₂O); two atoms of oxygen from oxygen molecules( O₂) and one carbon and two oxygen atoms make carbon dioxide ( CO₂) The different atoms also from compound molecules, such as glucose  and amino acids. The biologically importance acids lead to formation of enclosed unit of life , cell. Recall the first semester course "molecules of life"  where you have studied the structure and function of biomolecules. these macromolecules form the tiny structure called subcellular organelles without eukaryotic cells.

3. Cellular level:

You have studied that the smallest unit of organization of human body is the cell. you are aware that a cell is the smallest structural and functional unit of living beings including humans.

A cell is a complex structure and all life activities take place at cellular level. all eukaryotic cells are enclosed by a thin cell membrane ,and have cytoplasm and nucleus containing genetic material DNA ( red blood cells is an exception). these cells have different organelles each of which perform a specific function. 

Human body contain about 200type of cells which make up the tissue and organ with different shape and size. the shape and sizes of representative human cells type are given in fig. Each of these cell types can associate with the right kind of cells to form the tissues and organ of complex multicellular organism and perform specialized roles. 

4. Tissue level

Cells are the basis units of tissue. cells with similar structure and function work as a unit and are referred to as tissues. the examples included epithelial tissue, connective tissue ,muscular tissue and nervous tissue. each tissue has a specific structure and function.

5. Organ level

Several group of tissue from an organ. since each organ is made up of specific tissue and thus specific cells, they are responsible to carry unique function, such as heart pumps blood throughout  the body, stomach helps in food digestion and liver metabolism food stuffs and releases energy the lungs, liver, kidney, and intestines are other examples that perform specialized function. 

6. Organ system level

Body's organ work together as system. the efficiency of each system depends upon the function of each organ. if any organ in your body isn't working properly, it will affect the function of not that organ system but also other system.

7. Organism level

All organ systems work harmoniously incoordination to perform life activities in an organism. the common daily function of human body are digestion, locomotion (movement),respiration (breathing), reproduction (making new human beings),and control. several organs system work collectively for conducting life processes needed for the survival of an organism. for example ,human body cannot produces energy on its own. body needs and digest food which is transported to body cells through blood and is broken down by oxygen to supply the energy required to carry out the daily activities.