The Pacinian corpuscle is a mechanoreceptor found in the skin that transduces mechanical pressure into nerve impulses.
Which of the options correctly describes the physiological response of a Pacinian corpuscle to pressure?
The mechanical pressure deforms the membrane, opening stretch-mediated sodium ion channels and allowing sodium ions to diffuse into the sensory neurone.
Increased pressure causes more potassium channels to open, resulting in hyperpolarisation of the sensory neurone membrane.
A larger pressure stimulus produces action potentials of greater amplitude in the sensory neurone.
The Pacinian corpuscle acts as a transducer, directly converting mechanical energy into chemical energy stored in the lamellae.
22 exam-style questions on OCR A A Level Biology Neuronal communication. Each one has a worked solution and a mark scheme showing where the marks go.