Neurones Study guides, Class notes & Summaries

What is homeostasis? - ANSWER-The maintenance of a constant internal environment. What is a stimulus? - ANSWER-A change in your environment than requires a response. e.g Light, sound, touch, pressure, pain, chemical or temperature. What do the receptors do? - ANSWER-Detect the stimulus or change in environment. What happens after the receptors? - ANSWER-Receptors send messages to the CNS via the sensory neurone. What makes up the central nervous system? - ANSWER-The brain or spinal c...

Draw the reflex arc. - ANSWER What is homeostasis? - ANSWER Homeostasis involves physiological control systems that maintain the internal environment despite changes in the external environment of an organism within restricted limits. What factors does our internal environment consist of? - ANSWER Temperature, water potential, pH and blood glucose levels, water levels, etc. Why is homeostasis important? - ANSWER If body temperature and blood pH change too much then enzymes will becom...

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...

OCR A A level biology notes for chapter 13 neuronal communication. These detailed notes include everything you need to know about this chapter for the exam and helped me achieve an A grade at A level. (includes diagrams!!)

NEUROMUSCULAR SYSTEM QUESTIONS AND ANSWERS All or none law - ANSWER->Where a sequence of impulses must be sufficient intensity to stimulate all the muscle fibres in a motor unit in order for them to contract. If not, none of them contract Autogenic inhibition - ANSWER->Where the is a sudden relaxation of the muscle in response to high tension. The receptors involved in this process are Golgi tendon organs Golgi tendon organs - ANSWER->These are activated when there is tension in ...

AQA A LEVEL RESPIRATION EXAM QUESTIONS WITH ANSWERS VERIFIED. Suggest the advantages of the change in blood flow in blood vessels during exercise. [3 marks] -more blood flow to muscles during exercise -supplying more glucose and oxygen/ removing carbon dioxide/ lactic acid/ heat -for high rate of respiration/ to meet increased demand for energy Explain how microorganisms contributed to the increase in temperature during processing of organic waste. [2 marks] respiration produces heat ex...

Unit 9 Human Regulation and Reproduction The Nervous System The function of the nervous system is to detect internal and external environmental changes for our physical safety and survival. The nervous system monitors all functions of the body. It receives information from inside and outside the body and then sends signals to the appropriate organs in the body in direct response to this information. The central nervous system has two main organs: the brain and the spinal cord. The peripheral ...

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

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...

WHAT IS THE MOST CAUDAL PART OF PART IF THE CENTRAL NERVOUS SYSTEM? - ANSWER-SPINAL CORD WHAT EMBRYONIC BRAIN REGION IS THE PONS DEVELOPED FROM? - ANSWER-METENCEPHALON WHAT NEURAL CELL TYPE IS PURPORTED TO FORM THE SO CALLED "BLOOD BRAIN BARRIER"? - ANSWER-ASTROCYTES WHICH LOBE OF THE BRAIN IS SITUATED ON THE INFEROMEDIAL ASPECT OF THE CEREBRAL CORTEX? - ANSWER-LIMBIC WHAT IS THE LARGEST CROSSING FIBRES IN THE CNS? - ANSWER-CORPUS COLLOSUM IN GENERAL, HOW MANY NEURONES IN SYMPA...