A student waits two minutes after exercise before counting their pulse. They report this as the heart rate immediately after exercise.
Why is their reported value likely to be too low?
Stroke volume always falls to zero during the waiting period.
The pulse stops reflecting heart contractions during the waiting period.
Heart rate falls as the body recovers during the waiting period.
Red blood cells lose their haemoglobin during the waiting period.
42 exam-style questions on Edexcel GCSE Biology 8.2 Blood and circulation, covering 8.2.1 Structure and function of the blood, 8.2.2 Structure of blood vessels, 8.2.3 Structure of the heart and circulatory system, and 8.2.4 Cardiac output. Each one has a worked solution and a mark scheme showing where the marks go.