Cells, tissues & organs
new specification aqa biology unit 2 additional cells tissues and organs
- Created by: Chloe
- Created on: 13-01-13 13:34
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- Cells, tissues & organs
- Tissues
- Multicellular organisms differentiate
- Different cells have different functions
- Group of cells with similar structure & function
- Plants & animals have different tissues
- Plant tissues
- Epidermal tissue - covers the plant
- Mesophyll - can photosynthesise
- Xylem & Phloem - transport substances
- Animal tissues
- Muscle tissue - can contract
- Epithelial tissue - covers parts of body
- Glandular tissue - produces enzymes and hormones
- Multicellular organisms differentiate
- Organs
- Made of tissues
- Stomach is made of -
- Muscular tissue - churns food contents
- Glandular tissue - produces the Digestive juices
- Epithelial tissue - covers inside and outside
- Leaves, Stem and Roots and plant organs
- Organ Systems are formed by groups of organs
- The Digestive system ia a human organ system
- Digestive system
- Insoluble food molecules change in the digestive system
- Soluble food molecules are absorbed into blood
- Is a muscular tube which digests food
- Pancreas & Salivary glands -digestive juices
- Small intestine & stomach - digestion occurs
- Liver - produces bile
- Small intestine - absorbs soluble foods
- Large intestine - absorbs water & produces faeces
- Specialised cells
- Structure of a cell is linked to its function
- Cells with many mitochondria need energy
- e.g. Muscle cell, sperm cell
- Cells with many ribosomes' make a lot of protein
- e.g. Gland cells which produce enzymes
- Cells with tails can move
- e.g. sperm cells
- Receptor cells can detect stimuli
- e.g. cone cells in the eye are sensitive to light
- Neurons carry impulses receptors to CNS
- CNS - Central Nervous System
- Plant cells with many chloroplasts will be photosynthesising
- e.g. Mesophyll cells of a leaf
- Root hair cells increase surface area of root to absorb minerals ions & water
- Diffusion
- Molecules in liquids & gasses move because of the energy they have
- Is the spreading out of particles
- Net Movement into or out of cells
- movement from areas of high concentration to low
- CONCENTRATION GRADIENT - difference in concentration
- Larger difference in concentration, faster the rate of Diffusion
- Bacteria & Yeast
- Bacteria are much smaller than plant & animal cells
- Bacteria cells do not have a nucleus
- Yeas is a single-celled organism
- Bacteria multiply to form colonies
- Bacteria have a cell membrane & a cell wall around cytoplasm
- Tissues
- Is a muscular tube which digests food
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