A goalkeeper follows a ball at the far end of a pitch in bright floodlighting. The goalkeeper then enters a dim equipment room and examines a small code printed on a key held close to the eye.
Which combination of changes in muscle activity occurs as the eyes adjust?
The radial muscles of the iris contract and the ciliary muscles contract.
The radial muscles of the iris contract and the ciliary muscles relax.
The circular muscles of the iris contract and the ciliary muscles relax.
The circular muscles of the iris contract and the ciliary muscles contract.
102 exam-style questions on Edexcel GCSE Biology 2.4 The eye, covering 2.4.1 Structure and function of the eye and 2.4.2 Eye defects and their correction. Each one has a worked solution and a mark scheme showing where the marks go.