CXC CSEC exam guide: Human and Social Biology - Section B: Life Processes: Unit 5: Excretion and Homeostasis

CXC Human and Social Biology exam guide: Life processes Unit 1

CXC CSEC exam guide: Human and Social Biology



UNIT 5: Excretion and Homeostasis  

Specific Objectives

Students should be able to:


Explanatory notes


Explain the importance of excretion in human beings;

Include definition of excretion.

(Lnk to Specific Objective B1.27)


explain the roles of the organs involved in excretion;


Lungs, skin and kidney;

examples of metabolic waste



relate the structures of the kidney to their functions; 

internal structure of the kidney (diagram required),

structure and function of the nephron (diagram required);

selective reabsorption of substances;

composition of urine,

mention renal dialysis.




relate the structures of the skin to their functions; 

diagram required.


5. explain the concept of homeostasis;

Definition of homeostasis; examples of homeostasis.

6. explain the concept of feedback mechanisms;

Include regulation of carbon dioxide(CO2)



describe the regulation of blood sugar;

Role of insulin and glucagon.

(Link to Specific Objective D6)


8. explain the regulation of water;


9. distinguish between heat and temperature;


10. describe the regulation of temperature.


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