Biologi - Biology Chapter 3
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4 5 4 5 4 5 4 5 4 5 What we have learned earlier V arious types of responses are elicited by organisms in response to stimuli. Nervous system control s and coordinates numerous activiti es within the body . Control and coordinati on take place even in organisms such as hydra and planaria with low level of organization. Nervous system is formed of brain, spi nal cord and nerves. Brain is the centre that receives messages from various parts of the body and sends messages. Nerves are the pathways through which messages travel. Brain and nerves are formed of nerve cells. Formation of clot (thrombus) within the blood vessels of the brain is called cerebral thrombosis. Breakage of blood vessels of brain is call ed cerebral haemorrhage. Stroke is a condition that results when parts of the brain are deprived of blood. CONTROL AND COORDINATION CONTROL AND COORDINATION CONTROL AND COORDINATION CONTROL AND COORDINATION CONTROL AND COORDINATION 3
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