communication and homeostasis Flashcards
what is excretion?
the removal of metabolic waste from the body
what is cell signalling?
the way in which cells communicate with each other.
what is an effector?
a cell, tissue or organ that brings about a response
what is homeostasis?
maintaining a constant internal environment despite changes in the external and internal factors
what is negative feedback?
the mechanism that reverses a change, bringing the system back to optimum
what is positive feedback?
the mechanism that increases a change, taking the system further away from the optimum
what are sensory receptors?
respond to stimuli
what are the aspects maintained by homeostasis?
- body temp
- blood glucose
- blood salt conc
- water potential of blood
- blood pressure
- co2 concentration
what is an ectotherm?
relies on external sources of heat to maintain body temperature
what is an endotherm?
uses heat from metabolic reactions to maintain boy temp
