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humans cells - Coggle Diagram

- - - - or remove waste substances fast enough through simple diffusion.
- - - - Very narrow
      - Smaller
  - - - One-cell thick
      - Thicker
- - - - It is the liquid part of blood.
      - • It contains 90% water.
      - • It transports important substances in blood such as:
      - – hormones
      - – heat
      - – dissolved nutrients
      - – waste substances
      - – waste substances
      - – carbon dioxide
    - - • They help fight against diseases by destroying bacteria.
- - - - There are valves present in the heart. They ensure that blood flows in one direction only in the heart.
- - - - Veins ➤ Blood vessels that carry blood towards the heart