Chemistry of life and homeostasis

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6 Terms

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Elements of the body

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Homeostasis

the body maintains a fairly stable internal environment despite external factors

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regulate the internal concentration of:

  1. hydrogen

  2. calcium

  3. potassium

  4. sodium

  5. fluid balance

  6. oxygen

  7. PH level

  8. Glucose

  9. temperare

  10. Blood pressure

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Feedback loops

  1. set point: the normal range of a variable

  2. Stimulus: something that needs to be controlled for life e.g. temperature

  3. Receptor: detects a stimulus and sends a nerve impulse

  4. Control (coordination centre): the brain assesses information and decides what to do

  5. Effector: creates a change to influence the stimulus

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Negative feedback loop

Heat is an example if you get to hot you sweat, if to cold you shiver. basically your body keeping a regular internal environment

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Positive feedback loop

its the opposite to a negative feedback loop as it sets in motion a change. for example in child birth the baby stretching the cervix releases oxytocin causing stronger uterine contractions which pushes the bebeh out