Essay About Nervous System And Various Impulses

Explain the Concepts of Homeostasis Is with Reference to the Control of Heart Rate, Breathing Rate, Body Temperature and Blood Glucose Levels.
Explain the concepts of homeostasis is with reference to the control of heart rate, breathing rate, body temperature and blood glucose levels. Homeostasis is simply the act of the body controlling and maintaining its internal self to ensure a constant steadiness and regulation of crucial internal factors such as heart rate, breathing rate, body temperature and blood glucose levels, despite the external environment. Homeostasis is vital as human cells are extremely demanding. It is important to note that the term ‘constant’ within this context is not referring to an absolute or fixed state of internal factors, however it is rather referring to internal factors being kept within a confined range. This assignment will endeavour to thoroughly explain the concepts of homeostasis including reference to the control of heart rate, breathing rate and various other internal factors. Negative feedback in the body refers to the deviation of key variable’s accepted range limits, such as the PH of blood. This deviation provokes a response that returns the variable to within its designated range. An example of negative feedback can be seen within the liver. Once blood glucose levels fall, the liver glycogen converts into glucose to enable the vital energy levels to boost back up. The brain and nervous system are mainly responsible for controlling homeostatic mechanisms and they also play a part in forecasting the possibility of key variables rising or falling beyond the boundaries of their accepted ranges. For example, if it has been a while since a person has ate a meal and they are feeling cold and tired the body will begin to crave a hot meal as a response to these feelings. This act is regarded as ‘feedforward’ as oppose to feedback. Negative feedback systems depend upon; receptors to detect change, a control centre to receive the information and process a response and effectors to reverse the transitions and re-establish a response. The majority of control centres can be found within the brain. [pic 1]