Homeostasis Essay

Homeostasis Essay

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Homeostasis

Homeostasis works to maintain the organism's internal environment,
where the body's processes are able to function at a level that would
allow life to continue in that organism. The three systems which are
controlled by homeostasis are the respiratory, cardiovascular, and
muscular systems.

Changes to the cardiovascular system are often a result of changes in
the activities of other systems. The heart rate, the cardiac output
and the blood pressure change to different degrees of bodily activity.
The heart rate slows and cardiac output falls when demands on bodily
systems are less high. However the opposite is true when demands on
the bodily systems are high, the heart rate increases and also the
cardiac output also increases.

Breathing is essential to life: it allows oxygen to be taken in and
carbon dioxide to be given off. Processing food in order to obtain the
energy needed for a wide range of activities is dependent on a
continuous supply of oxygen to the cells. The respiratory system takes
in oxygen and excretes carbon dioxide. Homeostasis allows the
respiratory system to take in oxygen in many different situations
where the breathing rate is irregular.

Muscular activity requires a source of energy. When muscles are
working aerobically, three main products are created: heat, carbon
dioxide, and water. The heat produced by active muscles helps to
maintain body temperature, so muscle is contributing to heat
homeostasis. However, if more heat is being produced than is needed,
as for example during vigorous exercise, the excess heat has to be
lost from the body to prevent a harmful rise in body temperature.
...


... middle of paper ...


...k system that can regulate the controlled condition in the
body's internal environment. Feed back systems can either form
positive or negative systems.

Negative feedback system: In negative feedback a change in the
internal environment is monitored by the receptor and transmitted to
the control center. The control center then evaluates the input and if
necessary issues a output command to an effecter generating a response
which cancels the effect of the stimulus and re-establishes the
homeostatic condition.

Positive feedback system: This system tends to strengthen or reinforce
a change in one of the body's controlled condition. A change in the
homeostatic condition is detected by receptors and the information is
transmitted to the control center. The control center activates
effectors which generate a response.

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