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Homeostasis

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Homeostasis is the process by which a constant internal environment is maintained by our body. The surroundings of body cells inside our body can be called as an ‘internal environment’. For instance, this means that in the human body, temperature, blood sugar levels, heart rate, breathing rate, etc in the fluid surrounding body cells must be kept within a narrow range even when we are in a freezing climate, or while doing vigorous exercise etc. All homeostatic control mechanisms have at least three interdependent components which are: The receptor responds to changes in the environment, for example, detects when things such as temperature changes. Then, after the receptor senses a stimuli, it sends information to a ‘’control centre’’ to regulate the response. The control centre which is in the brain decides a response to the stimuli. Then, the control centre sends signals to an effector such as muscles and organs. Negative feedback is a control system that occurs when an important variable such as pH of blood deviates from the certain limits which can cause reactions that will turn variable into a normal range. For instance, negative feedback keeps our body temperature at a constant 37°C. If we get too hot, blood vessels in our skin vasodilate and we lose heat and cool down. If we get too cold, blood vessels in our skin vasoconstrict, we lose …show more content…

When there is too much glucose in blood, pancreas produces insulin which enters blood. Then, insulin allows glucose to be absorbed by body cells causing blood glucose to reduce. When there is too little glucose in blood, insulin will not be produced leading to less glucose being absorbed by the body cells and blood sugar to increase. Diabetes is a disorder in which the blood glucose levels remain too high as our body is unable to break down glucose into energy. He/she will feel very thirsty and tired and lose

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