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Homeostasis is the technical term for the maintenance of a constant environment inside the body, particularly concerning breathing rate, body temperature, heart rate and blood glucose levels.

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Introduction

Homeostasis Homeostasis is the technical term for the maintenance of a constant environment inside the body, particularly concerning breathing rate, body temperature, heart rate and blood glucose levels. Inside out cells their thousands of chemical reactions happening every second, these reactions keep us alive. However, in order for our cells to work properly they need certain condition, which is where homeostasis comes into place by maintaining a constant environment. Negative Feedback System Negative feedback occurs when an important variable, such as body temperature lowers or increases from the accepted range, which then triggers a response so that it can then return the variable back to its normal range. Negative feedback systems require: * Receptors to detect change * A control centre to receive the information and process the response * Effectors to reverse the change and return it to the original state When a receptor detects a change in the system, either an increase or decrease, which affects the constant rate of the body processes, the information is sent to the processing centre. ...read more.

Middle

Temperature detectors in the skin and internal organs monitor this and send messages to the hypothalamus in the brain to take appropriate action depending on whether it rises or falls. Heat is lost through four main processes and these are; * Radiation- which is like diffusion but of heat temperature * Convection- when you warm up the layer of air net to you and is moved upwards to be replaced by cooler air * Conduction- when you are warming up anything that you are in contact with, such as clothes. * Evaporation- which is when liquid is converted into water vapour. When the thermoreceptors detect that the body temperature is lower than normal, the heat gain centre inhibits the activity of the heat loss centre and sends impulses to the skin, hair erector muscles, and sweat glands to decrease heat loss and increase heat production. Heat is produced as a result of metabolic reactions within the body. ...read more.

Conclusion

Blood Glucose Levels Too High Blood Glucose Levels Too Low Receptors in the pancreas sends messages to the brain to indicate a feeling of satiety which then stimulates the individual to stop eating Receptors in pancreas sends messages to the brain to indicate a feeling of hunger which stimulates the individual to eat Stimulates cells in the pancreas to release insulin Stimulates cells in the pancreas to release glycogen Reduces levels of glucose in blood plasma Increases levels of glucose in blood plasma Utilises excess glucose by increasing respiration rate Reduces respiratory rate to slow down the rate that glucose is used Removes glucose from blood plasma by increasing glucose absorption by the liver and body tissues Reduces glucose absorption by the liver and other body tissues and stimulates the liver to convert amino acids into glucose Converts glucose into glycogen so that it can be stored Releases glycogen from the liver and muscles where it is stored and converts into glucose Blood glucose levels fall Blood glucose levels rise ...read more.

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