Structure of an epithelial cell
- Created by: Jasmin
- Created on: 19-10-13 15:41
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- Structure of an epithelial cell
- Function: absorb and secrete
- NUCLEUS: contains organisms hereditary material and controls cells activities, spherical
- Nuclear Envelope: double membrane that surrounds the nucleus
- Outer membrane is continuous with endoplasmic reticulum of cell, often ribosomes on surface
- Controls entry and exit of materials in and out of nucleus
- Contains reactions taking place within it
- Nuclear Pores: allow passage of large molecules out of nucleus, around 3000 pores in each nucleus
- Nucleoplasm: jelly like, granular material makes up bulk of nucleus
- Functions
- Control centre of cell through production of mRA hence protein synthesis
- Retain genetic material of cell in form of DNA and chromosomes
- Manufacture ribosomal RNA and ribosomes
- Nuclear Envelope: double membrane that surrounds the nucleus
- MITOCHONDRIAN: rod shaped
- Double Membrane: surrounds organelle, outer one controlling entry and exit of material
- Inner membrane folded to form extensions known as cristae
- Cristae: extensions of inner membrane and some extend across whole width of mitochondrian
- Provide a large SA for attachment of enzymes involved in respiration
- Cristae: extensions of inner membrane and some extend across whole width of mitochondrian
- Inner membrane folded to form extensions known as cristae
- Matrix: semi rigid material containing protein, lipids, traces of DNA which allows M to control production of own proteins
- Enzymes involved in respiration found in matrix
- Sites of certain stages of respiration
- Responsible for production of energy carrier molecule ATP from carbohydrates
- High level of metabolic activity so need supply of ATP
- Examples metabolically active cells include muscle and epithelial cells
- Use a lot of energy in process of absorbing substances from the intestines by active transport
- Examples metabolically active cells include muscle and epithelial cells
- High level of metabolic activity so need supply of ATP
- Double Membrane: surrounds organelle, outer one controlling entry and exit of material
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