Neurones and synapses Study guides, Class notes & Summaries

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...

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...

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...

AQA BIOLOGY ESSAY TITLES VERSION 2 Biology essay titles Version 2 This document contains the essay titles and mark schemes used in AQA A-level Biology examinations since 2007. The specifications these exam questions came from are no longer in use, but the marking method has largely remained unchanged. Further guidance on the marking method used with the essay can be found in Paper 3 Essay marking guidance. Year Questio nTitle 7402/3 2017 7.1 The impo...

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...

Detailed A* level notes covering the whole topic of neuronal communication(specification point 5.1.3). This is for the OCR A level Biology A course. These notes cover every single specification point within this topic and are concise but contain everything you need to know. Topics covered: - sensory receptors - neurones - action potentials - synapses

Summary Exam for Biological foundations of mental health 2023 Striatal Dopamine neurotransmission abnormalities in obesity and addiction - CORRECT ANSWER-Such persistent activation of the reward pathway occurs in the case of chronic drug abusers or even in individuals consuming unusually large quantity of food. To answer this question, scientists have quantified dopamine neurotransmission in the brains of addicted or obese individuals, using positron emission tomography-- PET. They...

Martin Caon Examination Questions and Answers in Basic Anatomy and Physiology Third Edition Chapter 10: Endocrine System 10.1 Endocrine System and Hormones in General 1. Which statement below about hormones is true? a. Hormones are enzymes that catalyse reactions. b. Hormones are released into the blood circulation. c. Hormones affect all cells of the body. d. Hormones are released by neurones at synapses. Answer is B: Hormones are circulating messengers that are transported in blood...

(synapses) inhibitory neurotransmitters - ANS-hyperpolarise postsynaptic membrane so potential difference is more negative, preventing an action potential from firing / eg GABA opens Cl- channels so hyperpolarises membrane (synapses) synapse definition - ANS-a junction between neurones and effectors (synapses) process - ANS-action potential reaches pre-synaptic knob and triggers release of neurotransmitters from vesicles / diffuse across synaptic cleft to post-synaptic neurone or effec...

AQA Education (AQA) is a registered charity (number ) and a company limited by guarantee registered in England and Wales (number ). Our registered address is AQA, Devas Street, Manchester M15 6EX. AQA BIOLOGY ESSAY TITLES VERSION 2 Biology essay titles Version 2 This document contains the essay titles and mark schemes used in AQA A-level Biology examinations since 2007. The specifications these exam questions came from are no longer in use, but the marking method has largely remained unchan...