Coordination
- Created by: Jasmine
- Created on: 21-02-16 13:57
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- Coordination
- why it is needed
- coordinate the functions of different cells and systems to operate effectively
- muscles need to respire constantly therefore need a good supply of oxygen in order to contract
- dependent on red blood cells for this
- in plants flowering needs to be coordinated with seasons- pollinators need to coordinate with plants
- temperature climates light sensitive chemicals allow plants to coordinate the development of buds with lengthening days- signals approach of summer and spring]
- muscles need to respire constantly therefore need a good supply of oxygen in order to contract
- coordinate the functions of different cells and systems to operate effectively
- homeostasis
- different organs have different functions in the body
- functions of organs must be coordinated in order to maintain a constant internal environment
- eg digestive organs such as exocrine pancrease, duodenum, ileum, endocrine pancreas and liver work together to maintain constant blood glucose concentration
- cell signalling
- coordination relies on communication
- one cell releases a chemical which has an effect on another cell known as the target cell
- cells can then:
- transfer signals locally eg between neurones at synapses-signal is a neurotransmitter
- transfer signals across large distances using hormones eg cells in the pituitary gland secrete ADH which allows cells in the kidneys to maintain water balance in the body
- coordination in plants
- they must respond to external and internal changes in the environment
- eg plants stem grow towards light source to maximise photosynthesis- achieved through use of plant hormones
- why it is needed
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