Organisms responses to internal and external changes Flashcards
What is a stimulus?
A change in the internal or external environment
What detects a stimulus?
A receptor
What formulates a response to a stimulus?
A coordinator
what are receptors specific to?
One type of stimulus
What do nerve cells do?
Pass electrical impulses along their length
What is a nerve impulse specific to and why?
A target cell only because it releases a chemical messenger directly to it
What is a nerve impulse response described as?
rapid, short-lived and localised
How do hormones travel to target cells
via the blood stream
What are hormones specific to?
The tertiary structure of receptors on their target cells
What are hormonal responses described as?
Slow, long-lasting and widespread
How do plants control their responses?
Using hormonal like growth substances
