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