Biology
- 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.
- Is the diffusion of water particles
- Through a partially permeable membrane
- Is the diffusion of water particles
- 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
- 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
- The molecules can move against a concentration
- Osmosis
- 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
- Tissues combine to form organs
- 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.
- 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.
- Movement in and out of cells:
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