Circulatory & Breathing Systems
- Created by: EmiliaR
- Created on: 16-09-18 14:55
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- Respiratory & Circulatory System
- Exchange & Transport
- stay alive- organisms must transport into cells...
- ... things they need from environment.
- Transport out waste products from environment
- Can be transported into or out of cells.
- Osmosis, diffusion or active transport.
- Can be transported into or out of cells.
- Gas exchange- lungs.
- Occurs in alveoli.
- Have large surface area, short diffusion pathway...
- ........ good blood and air supply- due to ventilation.
- Occurs in alveoli.
- stay alive- organisms must transport into cells...
- Lungs
- Responsible for gas exchange
- Breathe in- air flows through trachea and bronchi.
- Diaphragm & intercostal muscles contract
- Relax- breathe out
- Diaphragm & intercostal muscles contract
- Short diffusion pathway, huge surface area, good blood & air supplies
- Diffusion
- Substances move in & out of cells
- Random motion of particles in liquids & gases
- Particles press out- till concentrationequal
- Random motion of particles in liquids & gases
- Substances move in & out of cells
- A pump- double circulatory system
- Heart rate controlled by pacemaker
- A pump- double circulatory system
- Exchange & Transport
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