Cell Structure and Function

Cell functions

• Respiration: Cells require and absorb Oxygen to produce heat and energy. 
• Growth: Cells grow to maturity by manufacturing proteins. They may then divide or specialise.
• Excretion: Waste products pass out through the cell membrane. 
• Irritability: Cells can respond to a physical, chemical or thermal stimulus.

Human cell structure in detail

• Cell membrane: An outer coating which selectively transports substances into and out of the cell.
• Nucleus: The control centre of the cell, regulating its general and specialist functions.
• Ribosomes: Made of ribonucleic acid (RNA) and protein, they manufacture other proteins. 
• Rough and smooth endoplasmic recticulum: This manufactures…