Respiration and Gas Exchange
- Created by: meggilmore
- Created on: 02-04-16 13:52
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- Respiration and Gas Exchange
- Respirtation
- Aerobic
- Aerobic respiration needs oxygen
- Aerobic respiration happens all the time in animals and plants
- Most of the reactions in aerobic respiration happen inside mitochondria in cells.
- Note that respiration is different to breathing (ventilation)
- Anaerobic
- Unlike aerobic respiration, anaerobic respiration does not need oxygentled
- It is the release of a relatively small amount of energy in cells
- Anaerobic respiration happens in muscles during hard exercise:
- glucose ? lactic acid
- Aerobic
- Gas exchange in plants
- The Leaf
- The structure of the leaf is adapted for gas exchange
- The cells in thespongy mesophyll (lower layer) are loosely packed
- covered by a thin film of water
- There are tiny pores, called stomata, in the surface of the leaf
- The stomata control gas exchange in the leaf
- Each stoma can be open or closed, depending on how turgid its guard cells are.
- Diffusion of carbon dioxide, oxygen and water vapour into (or out of) the leaf is greatest when the stomata are open.
- In the light, the guard cells absorb water by osmosis, become turgid and the stoma opens.In the dark, the guard cells lose water, become flaccid and the stoma closes.
- The Leaf
- The respiratory system
- The trachea branches into two bronchi
- The bronchi split into smaller and smaller tubes called bronchioles.
- These end in microscopic air sacs called alveoli
- The bronchi split into smaller and smaller tubes called bronchioles.
- The bronchi split into smaller and smaller tubes called bronchioles.
- These end in microscopic air sacs called alveoli
- Untitled
- The trachea branches into two bronchi
- Respirtation
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