Good communication system will:
⦁ cover the whole body
⦁ enable specific communication
⦁ enable rapid communication
⦁ enable short term and long term responses
⦁ enable cells to communicate with each other
Stimulus -->A change in the environment that causes a response.
Response --> A change in behaviour or physiology due to a change in the environment.
Homeostasis --> Maintenance of the internal environment at a constant state despite external changes.
E.g. Bloob pressure, blood sugar levels, body temperature
Negative feedback --> Process that brings about a reversal in any change in conditions. (essential for homestasis).
Positive feedback--> A process that increases any change detected by receptors (Usually harmful & does not lead to homeostasis.)
Cell signalling--> A process in which one cell releases a chemical that is detected by another cell. This 2nd cell then responds to this signal.
Ectotherms--> An organism that relies on external sources of heat to regulate its body temperature.
⦁ Less food is used in respiration
⦁ May be able to survive for long periods without eating
⦁ Greater proportion of energy obtained from food, used for growth
⦁ Less active in cooler temperatures (more risk of predation)
⦁ May not be capable of activity during winter as they never warm up sufficiently.
Change behaviour or physiology to increase or decrease…