"grandmother cells" are mostly closely associated with coding.

"Grandmother cells" are mostly closely associated with specificity coding. Specifity coding is the representation of particular objects in a particular environment by the firing of neuron that are tuned to respond specifically to that object. Single cells fires only in response to the presence of a particular face say a grand mother but no response to any other face.

The adrenal gland

Explanation:

The adrenal gland which is located above the kidneys produces adrenaline, a stress  hormone that invokes a flight-or fight-response in the body. The body will experience increased heartbeats, tightened muscles, dilated pupils, and sweating. This gland is under the regulatory influence of the hypothalamus-pituitary-adrenal (HPA) axis.