1. Cell membrane
1.1. the outermost covering of a cell , which protects it and democrates it from other cells . It is selectively permiable
1.2. Plants have an additional membrane called cell wall made of cellulose and is tougth which lets it give the cell the right shape
1.3. cytomplasm
1.3.1. viscious jelly like substance present within the cell membrane .
1.3.2. most chemical reaction happen here
1.3.3. it contains several , living membrane bound bodies that have a definite shape and functions which are called cell organelles
1.3.4. cell organels in the cytoplasm
1.3.4.1. gogli appartus (gogli body)
1.3.4.1.1. several membrane bound , fluid sacs
1.3.4.1.2. packaging and transporting of fats and proteins
1.3.4.1.3. formation of lysosmes
1.3.4.2. vacuole
1.3.4.2.1. fluid filles encolsed by membrane
1.3.4.2.2. store excess water,useful minerals , pigmaents
1.3.4.2.3. large vacuoles are present in plant cells to maintain their shape
1.3.4.3. lysosomes
1.3.4.3.1. sucide bags of the cell
1.3.4.3.2. have chemical sustances called enzymes that are capable digesting cells
1.3.4.3.3. in times of emergencies they burst and destroy the cells
1.3.4.4. endoplasmic reticlum
1.3.4.4.1. interconnected network f tubes and channels involved in the syntheses , storage , transport of cell products
1.3.4.5. ribosomes
1.3.4.5.1. small granular structures scatterd around the cytoplasm
1.3.4.5.2. primary sites for proteins
1.3.4.5.3. found attached to endomplasmic retiulum
1.3.4.5.4. not found attached to the endoplsmic reticulum
1.3.4.6. mitochondria
1.3.4.6.1. powerhouses of the cell
1.3.4.6.2. double membrane bound spherical , rod shaped bodies
1.3.4.6.3. sites of energgy produtions
1.3.4.7. plastids
1.3.4.7.1. double membrane bound organeels
1.3.4.7.2. only in plants
1.3.4.7.3. green pogment chlorophyll help in making food
1.3.4.7.4. non green pigment that give color to flowers and fruits
1.3.4.7.5. colorless and store food in the form of carbohydrates , fats and proteins
1.3.4.8. centrosomes
1.3.4.8.1. only animal cells
1.3.4.8.2. help in the division of cells
2. Nucleus
2.1. numcleur membrane
2.2. nucleaur pores
2.3. chromatin fibres
2.4. nuclelous
3. Variation in cells
3.1. Organisms composed of one cell
3.1.1. unicellular organisms
3.2. organisms composed of many cells
3.2.1. multicellular organisms
3.3. help in movement through controcation thin and long
3.3.1. muscle cells
3.4. help in carrying messages from body to brain or spinal cord elongated
3.4.1. nerve cells
3.5. cover large are flat and broad
3.5.1. skin cells
3.6. Cell size may vary from a mircometre to few centimeters .
3.6.1. the smallest cell is cell of batera
3.6.2. the largest cell is cell of egg of an ostrich
3.6.3. nerve cells are beleived to be the longest
4. Types of cells
4.1. cells the lack a well defined nucleus but contain a genetic material floating in the cytoplasm
4.1.1. prokaryotic cells
4.1.2. bacteria and clue green algae
4.2. cells that have a well defined nucleus
4.2.1. eukaryotic cells
4.2.2. amoeba and paramoecium