BRAINCAKE

Cells and control

Edexcel GCSE BiologyTopic 2 of 917 lessons

Revision notes for Cells and control in Edexcel Biology (1BI0). Every lesson in BrainCake comes with R.E.C.I.P.E. recall steps, a quick check and spaced reviews.

  1. Mitosis and the cell cycleCells do not divide all the time.
  2. Importance of mitosisMitosis makes new cells that are genetically identical to the parent cell, so it is used whenever an organism needs more of the same cells.
  3. Daughter cells and chromosomesBefore a cell divides by mitosis it copies its DNA, so each chromosome is made of two identical chromatids.
  4. Cancer and cell divisionCell division by mitosis is controlled.
  5. Growth in animals and plantsGrowth is an increase in the size or mass of an organism.
  6. Importance of cell differentiationA fertilised egg divides by mitosis to make a ball of cells that are not yet specialised.
  7. Percentile charts and growthA percentile chart shows how a child's measurement compares with those of many other children of the same age and sex.
  8. Stem cells and meristemsA stem cell is an undifferentiated cell.
  9. Benefits and risks of stem cells in medicineStem cells could be used to replace cells that are damaged or lost through disease or injury.
  10. Describe the structures and functions of the brain including the cerebellum, cerebral hemispheres and medulla oblongataThe brain is part of the central nervous system.
  11. Explain how the difficulties of accessing brain tissue inside the skull can be overcome by using CT scanning and PET scanning to investigate brain functionThe brain is protected by the skull and is very delicate.
  12. Explain some of the limitations in treating damage and disease in the brain and other parts of the nervous system, including spinal injuries and brain tumoursThe brain and spinal cord are very complex and delicate, and they are hard to treat.
  13. Neurones, synapses and nerve impulsesA sensory receptor detects a stimulus and changes it into an electrical impulse.
  14. The reflex arcA reflex is a rapid, automatic response to a stimulus.
  15. Structure and function of the eyeThe eye is a sensory organ that detects light.
  16. Defects of the eyeSeveral defects can stop the eye forming a clear image.
  17. Correcting eye defectsEach eye defect is corrected by changing where the light is focused so that the image falls exactly on the retina.

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