A person moves out of the way of a falling object. Once the person is safe, no more adrenaline is released. At this time, the concentration of adrenaline in the blood is 8.0 nmol dm−38.0\ \mathrm{nmol\ dm^{-3}}8.0 nmol dm−3.
The concentration then halves every 4 minutes.
Calculate how long it takes for the concentration of adrenaline to fall to 0.50 nmol dm−30.50\ \mathrm{nmol\ dm^{-3}}0.50 nmol dm−3.
89 exam-style questions on Edexcel GCSE Biology 7.1 Hormones and coordination, covering 7.1.1 Endocrine glands and hormone transport, 7.1.2 Adrenalin and fight or flight, and 7.1.3 Thyroxine and negative feedback. Each one has a worked solution and a mark scheme showing where the marks go.