Response to Stimuli
Stimulus and Response:
Stumulus====>Detectable change in the internal or external environment
Abitlity to respond to a stimulus increases chance of survivial. E.G. moving away from harmful stimuli such as excessive heat.
Organisms that survive are more likely to pass their alleles onto offspring===> also a selection pressure. LINK TO ADAPTATION.
Stimuli are detected by receptors. Receptors transform the energy of a stimulus into some form on energy that can be processed by the organism and lead to a response.
Response is carried out by effectors. These can be a range of things such as muscle tissue, organs and systems.