Neurones and synapses Study guides, Class notes & Summaries
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AQA GCSE Biology - Paper 2 questions and answers
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What is homeostasis? 
The regulation of the conditions inside your body and cells to maintain a stable internal environment, in response to changes in both internal and external conditions 
 
 
 
Name three coordination centres 
The brain, the spinal cord and the pancreas 
 
 
 
What is negative feedback? 
When your body brings the level of something (e.g. water or temperature) back to normal if it becomes too high or too low 
 
 
 
What detects a stimulus? 
A receptor, e.g. skin receptors detec...
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AQA GCSE Biology - Paper 2 Graded A+
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AQA GCSE Biology - Paper 2 Graded A+ 
What is homeostasis? The regulation of the conditions inside your body and cells to maintain a stable 
internal environment, in response to changes in both internal and external conditions 
Name three coordination centres The brain, the spinal cord and the pancreas 
What is negative feedback? When your body brings the level of something (e.g. water or 
temperature) back to normal if it becomes too high or too low 
What detects a stimulus? A receptor, e...
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AQA GCSE Biology - B5
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AQA GCSE Biology - B5 
What is homeostasis? The regulation of conditions inside the body to maintain a stable internal 
environment in response to changes in both internal and external conditions 
What things do automatic control systems regulate? Body temperature, blood glucose level and 
water content 
What are the three main components that work together in automatic control systems? Receptors, 
coordination centres and effectors 
What does negative feedback do? When the level of some...
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All sample questions with matching correct answer in chapter 5
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negative tropisms - Answer-growth away from a stimulus 
Define homeostasis - Answer-Homeostasis is the regulation of internal conditions in the 
body. It is necessary to maintain optimal conditions for body functioning. These internal 
conditions can change as a result of processes within the body and as external 
conditions change. 
systems responsible for homeostasis - Answer-the nervous system - uses electrical 
impulses to communicate 
the endocrine system - uses chemical molecules to commun...
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AQA GCSE Biology Topic 5 Homeostatis
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AQA GCSE Biology Topic 5 Homeostatis 
Homeostasis The maintenance of a constant internal state in a changing environment 
Why is homeostasis important? Homeostasis is important because it is essential for the survival of 
cells and enzymes 
Automatic control systems are made up of Receptors, coordination centres, effectors 
negative feedback a mechanism of response in which a stimulus initiates reactions that reduce the 
stimulus 
Receptor Detects change 
Coordination centre Receives an...
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Edexcel A-level biology 2023 with complete solutions questions and answers
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Describe the events of fertilisation that occur after the acrosome reaction. 
-Membrane of sperm and egg cell fuse together 
-cortical granules release contents into zona pellucida 
-Zona pellucida thickens 
-Haploid nuclei fuse 
 
 
 
Explain how phospholipids form a cell surface membrane 
-Hydrophilic parts associate with water 
-Hydrophobic parts repel water 
-a bilayer forms with hydrophobic parts pointing in towards the centre of the bilayer 
 
 
 
Describe the role of the CFTR protein in e...
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AQA GCSE Biology topic 5 - Homeostasis and Response
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AQA GCSE Biology topic 5 - Homeostasis and Response 
Homeostasis maintaining a stable environment e.g. nervous and hormonal communications, body 
temp, blood glucose levels. 
negative feedback A process that counteracts a change - increasing and decreasing levels to maintain 
homeostasis, e.g. sweating to lower the body temp 
the nervous system A system that manages the body through negative feedback, hormones and 
effectors made up of Central nervous system (CNS - brain + spinal cord), se...
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AQA Biology Paper 2 ALL SOLUTION LATEST EDITION 2023 GUARANTEED GRADE A+
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homeostasis 
A tendency to maintain a balanced or constant internal state; the regulation of any aspect of body chemistry, such as blood glucose, around a particular level 
nervous system 
A conglomeration of billions of cells specifically designed to provide a communication network within the human body. 
receptors 
Special structures that allow living organisms to sense the conditions of their internal or external environment 
stimuli 
Changes, occurring within or outside the body, that affect...
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AQA GCSE Biology - The Nervous System
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AQA GCSE Biology - The Nervous System 
What does the nervous system enable humans to do? React to (their) surroundings (and) coordinate 
their behaviour 
What is the central nervous system? Brain and spinal chord 
What do your brain and spinal chord make up? C(entral )N(ervous )S(ystem) 
What are stimuli? Changes in the environment 
What are receptors? Cells detecting stimuli 
What is a nerve impulse? (An) electrical message 
Where does a nerve impulse travel? (Along a) neurone 
What is...
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AQA A Level Biology : Year 2- Nervous Coordination Graded A
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AQA A Level Biology : Year 2- Nervous Coordination Graded A 
What is the value of the resting potential of a neurone? 
Why is the resting potential of a neurone negative? -70mV 
There are more positive ions outside the cell 
than inside 
How is the resting potential maintained? 
actively transports 
3 Na+ out for ever 2 K+ into the neurone 
(ATP Hydrolysed) 
Sodium-potassium pump 
Membrane more permeable to K+ and less permeable to Na+ 
What happens if the sodium ion channels rema...
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