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Yr 7 Biology Revision, :arrow_up_down: - Coggle Diagram

- - - - breasts grow
      - hips become wider
      - period/ menstruation begins
      - ovaries release eggs
    - - get erections
      - growth spurt
      - testicles (aka testes) produce sperm
      - growth of pubic hair
      - penis and testicles increase in size
- - - - Sensory neurone- carries electrical signals- nerve impulses- towards the central nervous system. The signal starts in a receptor-whcih detects change.
      - Relay neurone- carry nerve impulses within the central nervous system
      - Motor neurones- carry nerve impulses away from the central nervous system. The neurone ends in either a muscle or gland, which are effectors.