Topic Summaries
Diffusion
Transport Systems
Blood and heart disease
Stem cells, microscopy, and microorganisms
Transport in cells
Human health and enzymes
Plant transport systems
Pathogens and non-specific immunity
The immune system and drugs
Plant disease and monoclonal antibodies
Photosynthesis and respiration
The nervous system and homeostasis
The brain and the eye
Hormone regulation and waste excretion
Reproductive hormones and plant hormones
Cell division, reproduction, and DNA structure
DNA synthesis and inheritance
Genetic engineering and modification
Evolution and natural selection
Species and classification
Resource cycles and environmental change
Biodiversity and environmental management
Biomass and trophic levels
Food supply and biotechnology
Science skills: Experimental procedures
Science skills: Presenting and using data
Science skills: Measuring results
Transport Systems
Blood and heart disease
Stem cells, microscopy, and microorganisms
Transport in cells
Human health and enzymes
Plant transport systems
Pathogens and non-specific immunity
The immune system and drugs
Plant disease and monoclonal antibodies
Photosynthesis and respiration
The nervous system and homeostasis
The brain and the eye
Hormone regulation and waste excretion
Reproductive hormones and plant hormones
Cell division, reproduction, and DNA structure
DNA synthesis and inheritance
Genetic engineering and modification
Evolution and natural selection
Species and classification
Resource cycles and environmental change
Biodiversity and environmental management
Biomass and trophic levels
Food supply and biotechnology
Science skills: Experimental procedures
Science skills: Presenting and using data
Science skills: Measuring results
- Diffusion is the net movement of particles in solution or of a gas from an area of higher concentration to an area of lower concentration.Examples include oxygen and carbon dioxide in gas exchange, and waste urea from cells into the blood plasma for excretion in the kidney.
- Factors affecting diffusion rate:
- Steeper concentration gradients increase diffusion rate.
- Higher temperatures increase diffusion rate.
- Increasing surface area increases diffusion rate.
- The effectiveness of diffusion exchange surface in humans is increased by having:
- A large surface area
- A thin membrane (short distance for diffusion)
- Efficient blood supply in animals
- Well-ventilated in animals for gas exchange
- Moist membrane in animals for gas exchange
|
Diffusion in human lungs
|
Diffusion in human small intestine
|
|
Diffusion in fish gills
|
Diffusion in plant roots
|
Diffusion in plant leaves
|
Unlock Diffusion
Subscribe to SnapRevise+ to get immediate access to the rest of this resource.
Premium accounts get immediate access to this resource.