The hyperalgesia that is common in phantom limb pain could potentially be blocked if a new drug was developed that could prevent (without triggering any side-effects) the
a) binding of enkephalins to nmda receptors
b) diffusion of calcium ions through nmda receptors
c) release of enkephalins diffusion of enkephalins
d) across synaptic clefts

The answer is B- Diffusion of calcium ions through NMDA receptors.

Explanation:

Phantom limb pain (PLP) is a painful sensation experienced after the loss or amputation of a limb. The limb is no longer there but the individual can still feel real and severe pains in the limb. This occurs soon after surgery.

NMDA is a receptor for Glutamate which is an excitatory neurotransmitter. The activation of NMDA receptors are associated with hyperalgesia which is an abnormally heightened sensitivity to pain.

on the planet jupiter, the acceleration due to gravity is approximately 26 m s2 , roughly 2.7 times the acceleration due

a covalent bond, specfically triple bond