Practice Questions
1.Blood flows through a vessel at a rate of 120 cm³ in 30 seconds. Calculate the rate of blood flow.
Rate = volume of blood/time taken
Rate = 120/30 = 40 cm3/s
2.A person’s heart rate is 95 beats per minute, and their stroke volume is 60 cm³ per beat.
Calculate the cardiac output (rate of blood flow from the heart).
Cardiac output = Heart rate × Stroke volume
Cardiac output = 95 x 60
Cardiac output (rate of blood flow) = 5700 cm3/min
3. Use the following table to answer the next question.
| Time (s) | Volume of blood (cm3) |
|---|---|
| 0 | 0 |
| 10 | 40 |
| 20 | 90 |
| 30 | 130 |
4. Jandeep keeps feeling very tired. Her doctor measured her pulse rate and found it to be lower than normal. How could her heart rate be corrected?
A pacemaker can be used to correct her irregular heart rate
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Measuring & calculating rates of photosynthesis
Inverse square law and photosynthesis
Economics of enhancing the conditions in greenhouses
Investigating the effect of light intensity on the rate of photosynthesis
Data analysis and nervous system
The effect of a factor on human reaction time
Controlling blood glucose concentration
Regulating water and nitrogen levels in the body.
Hormones and human reproduction
Using hormones to treat infertility
Control and coordination in plants using hormones
Investigating the effect of light or gravity on the growth of newly germinated seedlings