Marine biologists measured the blood flow rates to different organs and tissues of a Weddell seal while resting on ice and during a deep dive. The results are shown in the table below:
| Organ/Tissue | Rate of blood flow at rest (mL/min\text{mL/min}mL/min) | Rate of blood flow during a deep dive (mL/min\text{mL/min}mL/min) |
|---|---|---|
| Brain | 150 | 150 |
| Heart | 130 | 120 |
| Skeletal muscles | 1500 | 80 |
| Kidneys | 1100 | 30 |
| Digestive tract | 1200 | 10 |
| Other tissues | 420 | 20 |
| Total | 4500 | 410 |
Calculate how many times greater the total blood flow is when the seal is at rest compared to when it is performing a deep dive. Give your answer to the nearest whole number.
Explain the differences in blood flow to the skeletal muscles and the brain during a deep dive compared to when at rest.
194 exam-style questions on OCR GCSE Biology 2.1 Supplying the cell, covering 2.1.1 Transport across cell membranes, 2.1.2 Mitosis and the cell cycle, 2.1.3 Importance of cell differentiation, and 2.1.4 Stem cells. Each one has a worked solution and a mark scheme showing where the marks go.