Absorption & Secretion
- Created by: emily3
- Created on: 19-03-14 19:30
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- Absorption & Secretion
- Absoption
- Uptake of materials
- diffusion
- Secretion
- Discharge of useful intercellular molecules
- Secretion
- osmosis
- Secretion
- Discharge of useful intercellular molecules
- Secretion
- active transport
- Cell Wall
- Cellulose
- chains of glucose molecules grouped as fibres
- strong & rigid
- Plasma Membrane
- protein
- phospholipid
- Phospholipid bilayer
- hydrophilic head
- waterloving
- two outer surfaces
- forms hydrogen bond with water molecules
- outside layer in contact with extracellular fluid
- inside layer in contact with intracellular fluid
- hydrophobic tail
- water hating
- water insoluble
- hydrophilic head
- fluid arrangment
- provides stable and effective boundary
- allows small molecules through rapidly
- water
- larger molecules depend on proteins for entry/exit of the cell
- Glucose
- Proteins
- vary in size and structure
- provides structural support
- contain channels for small molecules
- act as carriers
- actively pump molecules across membrane
- serve as enzymes
- catalysing biochemical reactions in/on membrane
- selectively permable
- Active Transport
- movement of molecules across the plasma membrane
- against a conc. gradient
- opposite of passive transport
- always requires energy
- energy gained from respiration
- certain conditions required
- temperature
- availability of oxygen
- conc. of respiratory substance
- glucose
- movement of molecules across the plasma membrane
- Absoption
- slightly elastic
- chains of glucose molecules grouped as fibres
- strong & rigid
- chains of glucose molecules grouped as fibres
- Hydrophilic
- water loving
- spaces normally water filled
- Cellulose
- receptors for hormones
- Proteins
- vary in size and structure
- provides structural support
- contain channels for small molecules
- act as carriers
- actively pump molecules across membrane
- serve as enzymes
- catalysing biochemical reactions in/on membrane
- Proteins
- antigenic markers
- identify blood/tissue type
- freely Permeable
- diffusion
- opposite of passive transport
- osmosis
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