Homeostasis Ws1

Omar Bin Al-Khattab Sec. School Biology Dept

Homeostasis Worksheet – 1 Name : 1. Define Homeostasis. What is the importance of it? ____________________________________________________________________________ ____________________________________________________________________________ ______________ 2. What are the components of the control system that involved in homeostatic mechanism? What is the function of each component?  _______________ : _______________________________________________________________  _______________ : _______________________________________________________________  _______________ : _______________________________________________________________ 3. Define the following terms : 

Stimulus : _______________________________________________________________________

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Thermoregulation : _______________________________________________________________

4. What are the methods of heat gain and loss from an organism?  _______________ : _______________________________________________________________  _______________ : _______________________________________________________________  _______________ : _______________________________________________________________ 5. Compare between the ectotherms and endotherms according to the regulation of their body temperature.

Ectotherms

Endotherms 1

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6. Explain how does the lizard regulates their body temperature.

____________________________________________________________________________ ____________________________________________________________________________ ______________ ____________________________________________________________________________ ____________________________________________________________________________ ______________ 7. Draw a cross section in the skin. Label its main parts.

8. Explain why the skin considered as the most important part in the heat regulation. ____________________________________________________________________________ _______ 9. How does the hypothalamus detect changes in the body temperature? ____________________________________________________________________________ ____________________________________________________________________________ 2

______________Explain how does the following components helps in thermoregulation of the body : 

Capillaries : _____________________________________________________________________ _________________________________________________________________________ _______

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Sweat gland : ___________________________________________________________________ _________________________________________________________________________ _______

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Erector muscles : ________________________________________________________________ _________________________________________________________________________ _______

10.How does the thermoregulation occur at the following conditions : Overheating

Overcooling

Blood

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vessels

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Sweat

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gland

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Erector

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muscle Other mechanis

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11.By giving examples, explain how does the behavioral adaptations on an organism play a part in thermoregulation. _________________________________________________________________________ _______ _________________________________________________________________________ _______ 3