A2 Unit F214 - Communication, Homeostasis and Energy
Summary
thermoregulation topic summary
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Course
A2 Unit F214 - Communication, Homeostasis and Energy
Institution
OCR
coincise notes on thermoregulation in ectotherms and endotherms, including examples of heating up and cooling down for both organisms, and temperature receptors in hypothalamus and in skin.
definitions for homeostasis,
advantages and disadvantages of methods of heat exchange for both types of o...
A2 Unit F214 - Communication, Homeostasis and Energy
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Available practice questions
communication & homeostatis
Flashcards56 Flashcards
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Flashcards56 Flashcards
$5.460 sales
Some examples from this set of practice questions
1.
how do animals try to increase their chances of survival ?
Answer: by responding to changes in their internal and external environment
2.
what other words we can refer to changes in the internal and external environment?
Answer: stimuli
3.
what is the definition of homeostatis?
Answer: maintaining a constant internal environment to ensure optimal conditions for enzyme action and functions of all cells, despite fluctuations in the external environment
4.
what are the 2 communication systems in the body?
Answer: nervous system and endocrine system
5.
what is cell signalling?
Answer: communication between cells, for example by a hormone binding to its receptor
6.
example of cell signalling
Answer: 1 cell releases a chemical which has an effect on the target cell, which responds to the signal
7.
how can cells transfer signals ?
Answer: locally and over large distances
8.
example of how cells transfer signals locally?
Answer: neurotransmitters transfer signals between neurones at synapses
9.
example of how cells transfer signals over large distances ?
Answer: hormones travel through the bloodstream to reach a target cell and trigger a chemical response within the cell
10.
definition of negative feedback
Answer: reverse change detected
Content preview
COMMUNICATION
HOMEOSTASIS
___
INTRODUCTION
To increase survival chances, organisms need to respond to changes in their internal and
external environment (stimuli) and coordinate different functions of specialised cells, organs
and organ systems to operate efficiently.
Cell signalling (nervous system and endocrine system)
1 cell releases a chemical that has an effect on the target cell which responds to the signal
Cell can transfer signals :
- locally btw neurons at synapses (with neurotransmitters)
- Distantly : hormones travel in the bloodstream
Homeostasis
Maintains a constant internal environment for optimal conditions for enzyme action and all cell
functions, despite fluctuations in the external environment.
1. negative feedback
Reverses change detected
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