B3a
Teacher recommended
?- Created by: dreamer01
- Created on: 27-07-13 15:29
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- B3
- Gas Exchange
- large surface area
- thin surface
- good blood supply
- moist lining allowing gases to diffuse
- good ventilation
- Active transport
- movement of particles
- the concentration gradient,
- extra energy
- respiration
- extra energy
- the concentration gradient,
- movement of particles
- Exchange in the gut
- Lacteal
- absorbs fats and carries them away from the villus
- maintains concentration gradient for fat absoroption
- Dense capillary network
- inside each villus are many capilaries
- take away absorbed molecules
- inside each villus are many capilaries
- Epithelial membrane
- very thin - 1 cell thick
- provides short diffusion path
- digested food molecules
- provides short diffusion path
- very thin - 1 cell thick
- Lacteal
- Artificial breathing aids
- an iron lung
- maintains breathing
- artificial means.
- maintains breathing
- an iron lung
- Ventilation in the lungs
- in the throax
- lungs are protected by the ribcage
- intercostal muscles contract to move your ribs up and down
- increasing the volume of the thorax
- intercostal muscles contract to move your ribs up and down
- lungs are protected by the ribcage
- in the throax
- Exchange in plants
- Plants mainly lose water vapour through the leaves
- most of the loss of water vapour takes place through the stomata
- Plants mainly lose water vapour through the leaves
- Transpiration
- the process in which water movies up the xylem
- from the roots to evaporating out of the stomata
- the process in which water movies up the xylem
- Double circulatory system
- Arteries
- small so more pressure can be maintained.
- Veins
- larger so less pressure can be maintained
- Capillaries
- 1 cell thick to allow a high diffusion rate
- Heart
- Arteries
- Transport within the blood - blood is made up of:
- Plasma
- involved in transport around the body
- Carbon dioxide, blood cells, urea, digested food, hormones
- involved in transport around the body
- Red blood cells
- transport oxygen around the body
- White blood cells
- part of the body's defence for disease
- Platelets
- involved in the clotting of your blood
- Plasma
- Transport systems in plants
- Transpiration
- process in which water moves up the xylem from the roots to evaporating out of the stomata
- Factors affecting transpiration: light intensity, temperature, air movement. humidity
- Translocation
- the movement of sucrose (sugar solution) up the phloem.
- Transpiration
- Homeostasis
- maintaining a constant balance which creates a state of equilibrium
- Kidneys & Homeostasis
- Removal of urea
- Adjustment of ions in blood
- adjustment of water content of the blood
- Kidney Functions
- 1. Ultra filtration
- high pressure is built up
- which squeezes water, urea, ions & sugar out of blood.
- high pressure is built up
- 2. Reabsorption
- useful substances are reabsorbed back into blood:
- 1. All sugar
- 2. Sufficient ions
- 3. Sufficient water
- 2. Sufficient ions
- 1. All sugar
- useful substances are reabsorbed back into blood:
- 3. Release of wastes
- remaining substances e.g. urea are excreted.
- 1. Ultra filtration
- Kidney Failure
- Regular Dialysis
- to filter the blood - remove waste substances
- Transplant
- kidney transplants can be rejected by the body
- Regular Dialysis
- Controlling blood glucose
- Insulin and glucose control blood glucose level
- type 1 diabetes is caused by a lack of insulin
- Energy drinks
- replace lost water, sugar and ions
- Gas Exchange
- Red blood cells
- transport oxygen around the body
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