SBI 4U0 -Grade 12 University Biology
Thermoregulation Activities
Name(s): __________________
Date: _____________________
Part 1: Temperature Regulation
A) Detecting Temperature Changes
Materials:
3 Beakers, warm water, cold water, room temperature water, thermometers, hot
plate
Hypothesis: What will happen (with rationale) (1 mark)
Procedure: See page 333 of Nelson Biology 12
Discussion: Page 333 questions A and B (2 marks)
B) Cooling Effects of Evaporation
Purpose:
To investigate the relationship between evaporation and temperature.
Materials:
Cotton Balls, alcohol, water, elastic bands
Hypothesis: What will happen (with rationale) (2 marks)
Method:
1. Wrap a cotton ball around the bulb of a thermometer and secure it with an
elastic band.
2. Record starting temperature.
3. Dip the cotton ball and thermometer into a beaker of alcohol. Remove and
set it on your desk. Wait 3 minutes and record temperature reading.
4. Re-dip the cotton ball thermometer in the beaker of alcohol. Wave it in the
air for 3 minutes. Record temperature reading.
5. Place a drop of water and a drop of alcohol on the back of your hand. Which
evaporates faster? Which feels cooler?
Discussion:
1. What is the relationship between evaporation and temperature. (1 mark)
2. Where does the heat for evaporation of sweat come from? (1 mark)
Mammalian Diving Reflex  Bonus
Materials:
Ice Bath, thermometers, stopwatch.
Hypothesis: What will happen (with rationale) (1 mark)
Procedure: See page 340 of Nelson Biology 12
Discussion: Page 340 Questions a-c (3 marks)
Part 2: Regulation of Breathing
Part C: Effect of Stretch Receptors in the Lungs
Materials:
Stop watch
Hypothesis: What will happen (with rationale) (1 mark)
Method:
1. Breathe normally. After inhaling, hold your breath for as long as you can.
Record time.
2. Breathe normally. After exhaling, hold your breath for as long as you can.
Record your time.
Part D: Effects of Carbon dioxide
Materials:
Stop watch, paper bag, stairs
Hypothesis: What will happen (with rationale) (1 mark)
Method:
1. Hyperventilate 20 times then inhale and hold your breath. Time and record
your results in a data table.
2. Hyperventilate 20 times into a paper bag, then inhale and hold your breath.
Time and record your results in a data table.
3.Exercise vigorously (step-ups, push-ups, jumping jacks) for 5 minutes.
Inhale, hold your breath. Time and record your results in a data table.
Discussion for Part C and D:
1. Describe and explain the differences in results obtained in each part of Part D. (2 marks)
2. Describe and explain the differences in the results obtained in Part E. (2 marks)
3. Describe and explain why the results in the first part of Part D are different from the results
in the first part of Part E. (2 marks)
4. How might these responses help an Otter (Mammal) or Loon (Bird) dive underwater to
catch fish? (1 mark)
Marks:
Part One:
Results tables for parts B & B
Appropriate information in table
Hypotheses
Questions
0
0
0
0
1
1
1
1
2
2
2
2
3
4
Possible Bonus Marks for Mammalian Diving Reflex:
Results table (1), Information (1), Hypothesis (1) Questions (3)
Part Two:
Results tables for parts D & E
Appropriate information in table
Hypotheses
Questions
0
0
0
0
TOTAL
/24
1
1
1
1
2
2
2
2
3
3
4
5
6
7