Biology

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  • Created by: lucy
  • Created on: 29-11-12 17:45
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  • Biology
    • Movement in and out of cells:
      • Osmosis
        • Is the diffusion of water particles
          • It goes a down a water potential gradient.
        • It if from an area of high concentration to low concentration.
          • Is the diffusion of water particles
            • It goes a down a water potential gradient.
        • Through a  partially permeable membrane
        • Diffusion
          • The net movement of molecules within a gas or a liquid.
          • It is from an area of high concentrationto an area of low concentration
            • The net movement of molecules within a gas or a liquid.
          • It goes down a concentration gradient.
            • It results in a random movement and stops when a equilibrium.
              • It is from an area of high concentrationto an area of low concentration
            • Active  Transport
              • It requires energy
              • It involves protein carriers in membranes
                • The molecules can move against a concentration
                  • It requires energy
              • The molecules can move against a concentration
            • Tissues
              • Cells with similar structures and functions that are massed together to form tissues.
              • e.g.  Animal tissues: Epithelium, Connective tissue, Blood, Skeletal tissue, Nervous Tissue, Muscle tissue.
                • Cells with similar structures and functions that are massed together to form tissues.
              • e.g Plant: Epirdermis( protects against water loss), Mesophyll (photosythesis), xylem and phloem.
              • Organs and Systems
                • Tissues combine to form organs
                  • Tissue: Group of cells with similar structures, working together to perform a shared function.
                • Organs combine to form organ systems
                  • Organ: A group of systems, working together to perform specific functions
                  • Organ system:   group of organs with related functions, working together to perform body functions
                • e.g Organelle: Mitochondrion, Cell: Epithelial cell in intestine lining, Tissue : Epithelium lining the intestine, Organ: Small intestine, Organ System: Digestive System
              • Blood
                • Red Blood Cells: The have a dip in them and they are flexible to make sure they can fit through the capillaries, contains haemoglobin because it has no nucleus.
                  • Red blood cells (phagocytes) transport the blood from the lungs to the rest of the body in order for it to function.
                • White blood cells (lymphocytes)are weirdly shaped to allow the nucleus to get to different areas in the capillaries and have sensitive cell walls to detect micro-organisms.
                  • White Blood Cells fight disease.
                • Platelets: involved in blood clotting and can release blood clotting enzymes.

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