BY2: Gas Exchange WJEC
- Created by: brittani
- Created on: 18-03-14 18:03
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- Gas Exchange
- Humans
- Alveoli are the gas exchange surfaces in humans
- They are moist to allow oxygen to diffuse through the cell wall
- good bloody supply to keep the concentration gradient constant
- The cell wall is only 1 cm thick for a short diffusion pathway
- They are moist to allow oxygen to diffuse through the cell wall
- Alveoli are the gas exchange surfaces in humans
- Fish
- Water contains far less oxygen than air does
- each gill is supported by the gill arch, and each gill has 2 rows of lamellae
- once in water, the lamellae give large surface area for gas exchange
- The gill plates are the exchange surface in fish
- Blood vessels bring de-oxygenated blood the gill plates,
- Oxygen passes through the gill plates into the capillaries and carbon dioxide passes out into the water
- counter current flow
- blood in the capillaries flows in the opposite direction to the water flowing over the surface
- they extract 80% of oxygen from the water
- Insects
- system of tracheal tubes with spiracles open into a branching system that supply tissues with air
- tracheoles attached to the tissues allow oxygen to diffuse straight into the tissues
- the spiracles open and close so that it prevents water loss
- system of tracheal tubes with spiracles open into a branching system that supply tissues with air
- Breathing
- humans
- diagphram goes down, intercostal muscles contract, pulling the ribcage upwards, allowing more air into the lungs
- the internal intercostal muscles contract and the external intercostal muscles relax, diagphram moves upwards, forcing the outsdie of the lungs
- fish
- the mouth opens, the operculum closes, the floor of the mouth cavity lowers, the volume inside the mouth increase, water rushes into the mouth
- the moth closes, the floor of the mouth cavity is raised, the volume inside the mouth decreases, and the operculum opens and water flows out
- humans
- Humans
- Alveoli are the gas exchange surfaces in humans
- They are moist to allow oxygen to diffuse through the cell wall
- good bloody supply to keep the concentration gradient constant
- The cell wall is only 1 cm thick for a short diffusion pathway
- They are moist to allow oxygen to diffuse through the cell wall
- tracheoles attached to the tissues allow oxygen to diffuse straight into the tissues
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