Vascular plants and multicellular animals both have transport systems. In humans, the circulatory system consists of three main types of blood vessel: arteries, capillaries, and veins.
Complete the table by putting a tick (✓\checkmark✓) in each row to identify which blood vessels have each feature.
| Feature | Arteries | Capillaries | Veins |
|---|---|---|---|
| Have walls that are only one cell thick | |||
| Carry blood under very high pressure | |||
| Contain valves to maintain one-way blood flow |
Varicose veins is a condition that can develop when the valves in the veins of the legs fail to work properly.
Describe how this failure affects the flow of blood in these veins and suggest one symptom a person with varicose veins might experience.
The volume of blood pumped from the left ventricle into the aorta during one contraction is 80 ml80\text{ ml}80 ml.
Calculate the volume of blood that will be pumped into the aorta in one hour if a person has a resting heart rate of 72 beats per minute72\text{ beats per minute}72 beats per minute.
Volume = ................................................... ml/hour\text{................................................... ml/hour}................................................... ml/hour
Red blood cells contain haemoglobin to transport oxygen.
Give one other feature of red blood cells. How does this other feature allow the cell to perform its function?
82 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.