Biology 9700 · AS & A Level · Control and coordination in mammals
Control and coordination in mammals — practice question
Cloves are the fragrant flower buds produced by the tree Syzygium aromaticum. Eugenol is a drug obtained from cloves. Eugenol alters the passage of sodium ions across the cell surface membranes of sensory neurones.
(a(i))[2]
Describe how eugenol concentration changes the percentage decrease in sodium ion movement.
(a(ii))[1]
Using Fig. 6.1, work out the percentage decrease in sodium ion movement at a eugenol concentration of $0.5\,\text{mmol dm}^{-3}$.
(b)[5]
Suggest and explain how eugenol's action may lower pain.
Worked solution & mark scheme
This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “A higher eugenol concentration is associated with a larger percentage decrease in sodium ion movement.” …