1. The cells of the multicellular organisms body live within an internal environment.
2. The internal environment of multicellular organism consists of the interstitial fluid and the blood plasma.
3. The interstitial fluid / Tissue fluid fills the spaces between the cells and constantly bathes the cells
2. The internal environment of multicellular organism consists of the interstitial fluid and the blood plasma.
3. The interstitial fluid / Tissue fluid fills the spaces between the cells and constantly bathes the cells
4. In order for the cells to function optimally, the physical factors and chemical factors of the internal environment must be maintained constant.5. The physical factors include temperature, blood pressure and blood osmotic pressure. The chemical factors include concentration of oxygen and carbon dioxide in blood, salt and blood glucose content and blood pH value.
6. The body mechanism which maintain the internal environment of the cells constant so that it can function optimally is called homeostasis. Homeostasis is very important because when it fails you become ill and may die.
7. The internal environment has to be maintained constant so that all enzymes in the organism can function efficiently at all times.
8. In maintaining the internal environment constant, cells, tissues, organs and organ systems are working together. For example, both nervous system and endocrine system work together to maintain the blood pH.
8. In maintaining the internal environment constant, cells, tissues, organs and organ systems are working together. For example, both nervous system and endocrine system work together to maintain the blood pH.
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Appreciating the uniqueness of the cell.
1. A cell is the basic unit of all living organisms which is capable of functioning on its own.
2. All the organelles in the cell work together so that cells are able to function at its optimum level.
3. Just as there are many cell types, there are varied cell functions. The generalized cell functions include movement of substances across the cell membrane, cell division to make new cells, and protein synthesis.
4. Vital functions of an organism occur within cells, and all cells contain the hereditary information necessary for regulating cell functions and for transmitting information to the next generation of cells.
5. Cells are unique but without organelles, hundreds of regular cellular functions could not be performed.
Appreciating the uniqueness of the cell.
1. A cell is the basic unit of all living organisms which is capable of functioning on its own.
2. All the organelles in the cell work together so that cells are able to function at its optimum level.
3. Just as there are many cell types, there are varied cell functions. The generalized cell functions include movement of substances across the cell membrane, cell division to make new cells, and protein synthesis.
4. Vital functions of an organism occur within cells, and all cells contain the hereditary information necessary for regulating cell functions and for transmitting information to the next generation of cells.
5. Cells are unique but without organelles, hundreds of regular cellular functions could not be performed.
Possible Question :
Predict what happen if the following organelles are absent / damage.
( You must explain your answer)
Organelles and Effect if absent -
Nucleus----All cell activity cannot be controlled.
Golgi apparatus----Synthesis of carbohydrates, glycoprotein and hormone cannot be completed
Vesicle----Protein which has been modified cannot be transport out of the cell.
Smooth endoplasmic reticulum----Synthesis and transported of fat and glycerol cannot be done.
Rough endoplasmic reticulum----Transported of protein synthesized by ribosome could not be done.
Mitochondrion----No energy produced.Cells unable to carry out its activities.
Lysosome----Worn our organelles could not be digested
Ribosomes----Protein could not be synthesized
Chloroplast----Photosynthesis could not take place in plants
Vacuoles----The plant cell would loss its shape and turgidity
--There is no place to store sugars, amino acids and waste products.
Nucleus----All cell activity cannot be controlled.
Golgi apparatus----Synthesis of carbohydrates, glycoprotein and hormone cannot be completed
Vesicle----Protein which has been modified cannot be transport out of the cell.
Smooth endoplasmic reticulum----Synthesis and transported of fat and glycerol cannot be done.
Rough endoplasmic reticulum----Transported of protein synthesized by ribosome could not be done.
Mitochondrion----No energy produced.Cells unable to carry out its activities.
Lysosome----Worn our organelles could not be digested
Ribosomes----Protein could not be synthesized
Chloroplast----Photosynthesis could not take place in plants
Vacuoles----The plant cell would loss its shape and turgidity
--There is no place to store sugars, amino acids and waste products.
Happy Revising..
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