Homeostasis We are learning to • Identify what homeostasis is • Describe what mechanisms can be used to maintain a constant body temperature. • Describe how thermoregulation is controlled by negative feedback and the role of the hypothalamus and receptors. I can • Define the terms Homeostasis, ectotherm, endotherm and negative feedback. • I can describe the mechanisms utilised to control body temperature and explain how they work to increase/reduce heat loss.
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Homeostasis · 2019-12-14 · Homeostasis We are learning to • Identify what homeostasis is • Describe what mechanisms can be used to maintain a constant body temperature. •
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Homeostasis
We are learning to
• Identify what homeostasis is
• Describe what mechanisms can be used to maintain a constant body temperature.
• Describe how thermoregulation is controlled by negative feedback and the role of the hypothalamus and receptors.
I can
• Define the terms Homeostasis, ectotherm, endotherm and negative feedback.
• I can describe the mechanisms utilised to control body temperature and explain how they work to increase/reduce heat loss.
Homeostasis
• Homeostasis is the maintenance of the body's internal environment within limits despite the external environment
• Regulation requires energy and is under negative feedback control
Negative feedback control
• When a body’s internal environment deviates from ‘normal’ it is detected by receptors
• Receptors send hormonal or nervous impulses
• Effectors act to return the environment back to ‘normal’
Conditions in the body change from
set point
Change detected
(by receptors)
Corrective mechanism(s) activated (by nerves or
hormones)
Corrective mechanism(s) switched off
Conditions returned to set point (by effectors)
Thermoregulation
• Thermoregulation is the control of temperature in an organism.
Y is a ectotherm/conformer because • Internal has varied with external
Z is a endotherm/regulator because • Internal has remained the same
Role of the hypothalamus
• The hypothalamus is the temperature monitoring centre. It contains thermoreceptors and receives electrical impulses through nerves from receptors in the skin
• It also senses the temperature of blood
• The hypothalamus sends appropriate impulses to effectors to trigger corrective feedback