Observing how breathing depth and frequency affect heart rate. Typical Results and Findings

Additional lab report examples and diagrams for this grade level are available on Super Resheba .

Comparing measurements during maximum inhalation and maximum exhalation to calculate respiratory excursion.

Based on typical 9th-grade biology curricula by these authors, Practical Work №4 generally includes the following sections:

Stopwatches, measuring tapes, and sometimes spirometers (though simpler household tools are often substituted in workbooks). Experimental Tasks:

Students are usually required to fill out tables and draw conclusions based on their measurements.