Biologija Dragomilov Laboratornaja Rabota 6 Spishi.ru — 8 Klass
Laboratory Work â„–6: Changes in Heart Rate (HR) During Physical Activity
To observe how physical stress affects the circulatory system and determine the rate of recovery. Equipment: A stopwatch (or a watch with a second hand). Procedure and Typical Results:
Immediately measure your pulse for 15 seconds and multiply by 4. Example: 30 beats in 15 sec × 4 = 120 bpm . Laboratory Work №6: Changes in Heart Rate (HR)
Sit down and measure your pulse again after 3 minutes of rest. Example: 75 bpm . Conclusion/Answers:
Based on common curriculum standards found on educational platforms like Infourok , here is the standard structure and answers you would find for this lab. Example: 30 beats in 15 sec × 4 = 120 bpm
In the 8th-grade biology textbook by Dragomilov and Mash, Laboratory Work â„–6 is typically titled (or focuses on cardiovascular/respiratory responses like heart rate).
If your heart rate returns to near-resting levels within 3–5 minutes, your cardiovascular system is functioning normally. A slow recovery may indicate a lack of physical fitness. Evaluation of Results: your cardiovascular system is functioning normally.
Depending on your specific edition of the textbook, Laboratory Work â„–6 might alternatively be "The Composition of Inhaled and Exhaled Air." If your lab involves limewater and blowing through a straw, the answer is that exhaled air turns limewater cloudy because it contains more carbon dioxide than atmospheric air.