7 Levels of Organization

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					7 Levels of Organization
Dr. Muhammad Rafique

Every animal has five major levels of organization: cell, tissue, organ, organ system and organism. Each level in is of increasing complexity, and all organ systems work together to maintain life.


Levels of Organization in the Human Body
The simplest level of organization within the body is the chemical level, which is composed of atoms and molecules.

Level of Organization in Human
1.Cell 2.Tissue 3.Organ 4.Organ System 5.Organism

1. 2. 3. 4. 5. 6. 7.

7 Level of Organization
Atom Molecule Cell Tissue Organ Organ System Organism

Level 1 Atom
Atoms are the smallest units of matter. The different are important parts of Carbohydrate, Lipid and proteins like H, N, C, O These are called as elements that, why included in organization of human

Level 2 Molecules
Two or more atoms combine to form a molecule, such as a protein, a water molecule, or a vitamin. Macromolecules. Larger and more complex molecules such as DNA and proteins.

Cell’ s Organelles
At the cellular level, specialized structural and functional units called organelles permit all living cells to share some common functions.

Large molecules join in specific ways to form cells, the basic units of structure and function in organisms. The cell is the smallest structural unit that exhibits the characteristics of living things(organisms), and it is the smallest living portion of the human body.

Level 3 Cell

Level 4 Tissues
Groups of similar cells with a common function form tissue. Tissues are precise organizations of similar cells that perform specialized functions.




Level 5 Organs
Different tissue types that work together to perform specific, complex functions form an organ.

Level 6 Organ Systems
The organ system level consists of related organs that work together to coordinate activities and achieve a common function. There are 11 organ systems in the human body.




All body systems function interdependently in a single living human being, the organism

Body Basic Tissues
The Five Types of Tissues in the Human Body Are: Epithelial tissue Connective tissue Muscles tissue Nervous tissue Blood

Provides protection Regulates body temperature Site of cutaneous receptors Synthesizes vitamin D Prevents water loss

Skeletal System
Provides support and protection Site of hematopoeisis (blood cell production) Stores calcium and phosphorus Allows for body movement

Muscular System
Produces body movement Generates heat when muscles contract

Nervous System
A regulatory system that controls body movement Responds to sensory stimuli Helps control all other systems of the body Also responsible for consciousness, intelligence, memory

Endocrine System
Consists of glands and cell clusters that secrete hormones, some of which Regulate body and cellular growth chemical levels in the Body reproductive functions

Cardiovascular Vascular System
Consists of a pump (the heart) that moves blood through blood vessels in order to distribute hormones, nutrients, gases, and pick up waste products

Lymphatic System
Transports and filters lymph (interstitial fluid) Initiates an immune response when necessary

Respiratory System
Responsible for exchange of gases (oxygen and carbon dioxide) between blood and the air in the lungs

Digestive System
Mechanically and chemically digests food materials Absorbs nutrients Expels waste products

Urinary System
Filters the blood and removes waste products from the blood Concentrates waste products in the form of urine, and expels urine from the body

Male Reproductive System
Produces male sex cells (sperm) and male hormones (e.g., testosterone) Transfers sperm to the female

Female Reproductive System
Produces female sex cells (oocytes) and female hormones (e.g., estrogen and progesterone) Receives sperm from male Site of fertilization of oocyte Site of growth and development of embryo and fetus

Level No 7

The creator of the universe works in mysterious ways. But he uses a base ten counting system and likes round numbers. Scott Adams