• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

What is Homeostasis?

Extracts from this document...

Introduction

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. ...read more.

Middle

All systems must have homeostasis to maintain stability and to survive. Homeostasis is so important because it can allow an animal to adapt to a changing environment. The body attempts to maintain a constant level of physical output to achieve homeostasis. However, it can only work within its limits, where extreme conditions can disable the negative feedback mechanism. In humans, the process is a little different. It involves a constant monitoring of lots of different factors. An example of one of the factors it monitors is the gases oxygen and carbon dioxide. The concentrations of these substances in body fluid remain unchanged, despite changes in the external environment. The body can regulate its internal environment through feedback systems. A feedback system is a cycle of events in which the condition of the body is monitored, changed, re-monitored and re-evaluated. ...read more.

Conclusion

The control center then sends information to effectors which generate a response to the change in the internal environment. The group of effecters communicating with their control center forms a feedback 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. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Information Systems and Communication section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Information Systems and Communication essays

  1. Marked by a teacher

    Database Coursework on a Vehicle Rental System: Analysis

    5 star(s)

    The return date of the rental will be calculated automatically; 14. Overdue fees will be calculated automatically, and exponential to the number of days overdue; 15. List of vehicles due back on a particular day displayed onscreen/printed; 16. List of vehicles currently rented out displayed onscreen/printed; 17.

  2. Why homeostasis is a central theme in animal physiology

    or directly into the blood stream, (endocrine system). Homeostasis therefore is controlled by many systems, and although complex, many multi organ physiological mechanisms help regulate in many ways. However the theory of an internal environment wasn't recognised until a French physiologist Claude Bernard in 1872 put forward the idea of a constant internal environment stating, 1"Constancy of the internal environment is the condition of free life".

  1. ict as level coursework

    If you are experiencing any difficulties the best thing to do is make a note of the problem and contact us a soon as possible so we can come up with a solution. Troubleshooting FQA's Why doesn't the user form load up when I open the system?

  2. Cunha & Ribeiro Ltd: Stock Control & Invoice Database

    How often is it collected? It is normally collected after each sale or during each sale so timing can vary. 8. How is the information processed? The information collected is taken and processed into invoices and placed in address books. 9. Who processes the information? I process this information.

  1. Database Coursework on a Rental System: Design

    Data can be held in a single file, arranged in rows and columns and cells. This is a flat-file database, so there is much data redundancy and inconsistency Different data can be held in multiple interrelated files, reducing data redundancy and maximising data consistency Query data to find a specific

  2. communication and values

    And getting answer from them saying yes. In my one to one interaction at the end I got expression of new idea from the client by designing the card in other ways and to make different words in my group interaction.

  1. Performance Evaluation of an End-to-End Measurement Based Call Admission Control Method

    Thus IntServ is only used in access networks. Although DiffServ is scalable, it can provide weaker guarantees [2], because it does not maintain per-flow statistics. It is basically used in IP-core networks. Providing QoS also introduces the concept of Call Admission Control (CAC), which is a mechanism deciding if a new flow can be admitted to the network

  2. Emotional Minds - The Human Condition.

    It has been shown that many very different emotions result from very similar physiological changes and so there must be more to an emotion than this theory suggests. Finally there is the Schacter-Singer Theory. I believe that this theory is one of the best I have read about because it

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work