Communication Flashcards
List conditions required for enzymes to function properly?
Suitable temperature
Suitable ph
Aqueous environment that keeps substrates and products in solution
Define Stimulus
A change in the external or internal environment of an organism
Define response
The way in which the organism changes its behaviour or physiology in reaction to a stimulus
What will a good communication system Have/ do?
Cover the whole body
Enable cells to communicate with each other
Enable specific communication
Enable rapid communication
Enable both short term and long term responses
Three ways cells communicate with each other
Inside cells between components
Outside the cell between cells
Different molecules send different signals
What are the 2 major systems of communication?
Neuronal system: interconnected network of neurones (nerve cells) — rapid response
Hormonal system: Hormones released into blood from an endocrine gland. Recognised by target cells.— longer term responses
Describe how hormones are used as messengers
Hormones are chemical messengers transported in the blood
Cell communication is often mediated by a hormone
Target cells any cell with a receptor for a hormone
Hormone and receptor on target cells bind due to their complementary shapes
Binding causes the target cell to respond in a certain way