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/storage/hf-datasets-cache/all/datasets/90464960732238-config-parquet-and-info-Achitha-10th_science_tami-3da38f41/downloads/extracted/d9d4926c0124d2e04cd19b14dc563fffc63a20ec0a8fb643177acf601be9c5d5/train/chapter 7 93-120 (20).mp3
Let us look at the other use of the word ‘reflex’ that we have talked about in the introduction.
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Our mouth waters when we see food we like without our meaning to.
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Our hearts beat without our thinking about it.
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In fact, we cannot control these actions easily by thinking about them even if we wanted to.
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Do we have to think about or remember to breathe or digest food?
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So, in between the simple reflex actions like change in the size of the pupil, and the thought out actions such as moving a chair, there is another set of muscle movements over which we do not have any thinking control.
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Many of these involuntary actions are controlled by the mid-brain and hind-brain.
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All these involuntary actions including blood pressure, salivation and vomiting are controlled by the medulla in the hind-brain.
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Think about activities like walking in a straight line, riding a bicycle, picking up a pencil.
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This is the second way in which the nervous system communicates with the muscles.
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The communication between the central nervous system and the other parts of the body is facilitated by the peripheral nervous system consisting of cranial nerves arising from the brain and spinal nerves rising from the spinal cord.
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The brain thus allows us to think and take actions based on that thinking.
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As you will expect, this is accomplished through a complex design, with different parts of the brain responsible for integrating different inputs and outputs.
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The brain has three such major parts or regions, namely the fore-brain, mid-brain and hind-brain.
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The fore-brain is the main thinking part of the brain.
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It has regions which receive sensory impulses from various receptors.
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