Homeostasis In order to function properly and efficiently, organisms have different control systems that ensure their internal conditions are kept relatively constant Physiological control systems ...
Muscle Pairs The effective movement of the human body requires both muscle and an incompressible skeleton This is because muscles will only produce effective movement if they pull on a structure th...
Myelinated Motor Neurones Information is sent through the nervous system as nerve impulses – electrical signals that pass along nerve cells known as neurones A bundle of neurones is known as a nerv...
Responding to Change Aids Survival Organisms must respond to changes in their environment in order to survive They can only survive if they are successful at: Finding favourable conditions for livi...
Nutrient Cycles Living organisms require nutrients from their environments for growth and other processes (e.g. reproduction) These nutrients are then returned to the environment when organisms pro...
Plants are Primary Producers An ecosystem in a particular area includes: All the living components (i.e. biotic factors such as organisms and their interactions) All the non-living components (i.e....
Structure & Function of the Mitochondria Mitochondria are rod-shaped organelles 0.5 - 1.0 µm in diameter They are the site of aerobic respiration in eukaryotic cells The function of mitochondri...
Chloroplast Structures & their Functions Chloroplasts are the organelles in plant cells where photosynthesis occurs Each chloroplast is surrounded by a double-membrane envelope Each of the enve...
Biodiversity Biodiversity can be thought of as a study of all the variation that exists within and between all forms of life Biodiversity looks at the range and variety of genes, species and habita...
