Biology Unit 5 Chapter 12 -
Homeostasis Exam With
Comprehensive Questions and Well
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, What is homeostasis? (2) - correct ans:The maintenance of a constant internal environment;
allows cells to function normally despite external changes
What is the importance of homeostasis? (6) - correct ans:pH and temperature affect enzymes;
may reduce efficiency of enzymes/denature enzymes;
need reactions to occur at a constant, predictable rate;
Changes to water potential causes water to enter or leave cells;
so cells shrink and expand;
so blood glucose must be maintained
What are the features of a control mechanism? (5) - correct ans:Set point (desired level/norm);
Receptor (detects deviation from set point and informs controller);
Controller (coordinates information from receptor to effector);
Effector (brings about changes to return system to set point);
Feedback loop (informs receptor of changes done by effector)
Explain why maintaining a constant temperature is important in mammals. (3) - correct ans:Enzymes
function within a narrow range of temperatures;
Fluctuations from optimum temperature reduce efficiency/denature enzymes;
Need reactions to occur at a constant, predictable rate
Explain why maintaining a constant blood glucose concentration is important in mammals. (3) - correct
ans:Important in maintaining constant water potential;
Changes may cause cells to shrink or expand due to water entering or leaving cells;
Reliable source of glucose for respiration by cells
How is body temperature regulated in ectotherms? (3) - correct ans:Adapt behaviour to changes in the
external temperature;
Expose themselves to sun;
Homeostasis Exam With
Comprehensive Questions and Well
Elaborated Correct Answers GRADED
A+
Professional Academic Assistance Services
Services Offered
Proctored Exam Assistance
Online Class Management (Full Course Support)
Exam Preparation & Study Materials
Assignments and Coursework Support
Essays and Research Papers
Discussion Posts and Replies
, What is homeostasis? (2) - correct ans:The maintenance of a constant internal environment;
allows cells to function normally despite external changes
What is the importance of homeostasis? (6) - correct ans:pH and temperature affect enzymes;
may reduce efficiency of enzymes/denature enzymes;
need reactions to occur at a constant, predictable rate;
Changes to water potential causes water to enter or leave cells;
so cells shrink and expand;
so blood glucose must be maintained
What are the features of a control mechanism? (5) - correct ans:Set point (desired level/norm);
Receptor (detects deviation from set point and informs controller);
Controller (coordinates information from receptor to effector);
Effector (brings about changes to return system to set point);
Feedback loop (informs receptor of changes done by effector)
Explain why maintaining a constant temperature is important in mammals. (3) - correct ans:Enzymes
function within a narrow range of temperatures;
Fluctuations from optimum temperature reduce efficiency/denature enzymes;
Need reactions to occur at a constant, predictable rate
Explain why maintaining a constant blood glucose concentration is important in mammals. (3) - correct
ans:Important in maintaining constant water potential;
Changes may cause cells to shrink or expand due to water entering or leaving cells;
Reliable source of glucose for respiration by cells
How is body temperature regulated in ectotherms? (3) - correct ans:Adapt behaviour to changes in the
external temperature;
Expose themselves to sun;
