A warehouse worker hears a warning alarm and quickly pulls a loaded trolley away from a falling stack. Adrenaline increases blood flow to the worker's arm muscles and acts on the liver.
Which statement gives the correct liver response and its effect on the arm muscles?
The liver releases extra adrenaline, which travels to the arm muscles and supplies the energy for their contraction.
The liver converts glycogen to glucose, which reaches the arm muscles and acts as a hormone that causes contraction.
The liver respires glycogen and sends the released energy in the blood to the arm muscles for contraction.
The liver converts glycogen to glucose, which reaches the arm muscles and increases their rate of aerobic respiration.
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.