Respiration (a) outline why plants, animals and microorganisms need to respire, with reference to active transport and metabolic reactions Respiration– the process whereby energy stored in complex organic molecules (carbohydrates, fats and proteins) is used to make...
Animal Behaviour explain the advantages to organisms of innate behaviour Behaviour – the responses of an organism to its environment, which increase its chances of survival. An organism must be able to detect changes in the environment, which form stimuli, then carry...
Plant Responses explain why plants need to respond to their environment in terms of the need to avoid predation and abiotic stress Like animals, plants must also need to respond to external stimuli. This is important to: Avoid predation. Avoid abiotic (non-living)...
Excretion (a) define the term excretion Excretion - the removal of metabolic waste from the body, of by-products or unwanted substances from normal cell processes. Functions of the Liver: control of: blood glucose levels, amino acid levels, lipid levels synthesis of:...
Communication outline the need for communication systems within multicellular organisms, with reference to the need to respond to changes in the internal and external environment and to co-ordinate the activities of different organs All living things to maintain a...
Hormones (a) define the terms: (b) explain the meaning of the terms first messenger and second messenger, with reference to adrenaline and cyclic AMP (cAMP) First messenger - the hormone that transmits a signal around the body. Second messenger - molecules called cAMP...
Nerves outline the roles of sensory receptors in mammals in converting different forms of energy into nerve impulses Sensory receptors – specialised cells that can detect changes in our surroundings. They are energy transducers that convert one form of energy...