Investigating Human Respiration

SCIENTIFIC CONCEPTS/PROCESSES

• Creating models is one way to understand and communicate scientific information
• Each system within the human body is defined by the functions that it performs
• Lungs provide surface area for oxygen to enter and carbon dioxide wastes to leave the blood
• An indicator can help measure changes, such as shifts in the concentration of carbon dioxide present in a solution

Students explore the role of the respiratory system in the regulation of gases in the blood. Students qualitatively investigate the use of bromthymol blue (BTB) as an indicator. They then quantitatively measure the amount of carbon dioxide in their exhaled breath by using the indicator to perform a simple titration.

Contents List

• 1 Teachers Guide with MSDS
• 32 Student Worksheets and Guides
• 24 plastic cups
• 4 dropper bottles of bromthymol blue (BTB) indicator
• 8 dropper bottles of 0.05 M sodium hydroxide
• 8 SEPUP trays
• 8 droppers
• 16 stir sticks
• 16 30-mL graduated cups
• 16 1-gallon plastic bags
• 18 straws