When two excitatory postsynaptic potentials (epsps) occur at a single synapse so rapidly in succession that the postsynaptic neuron's membrane potential has not returned to the resting potential before the second epsp arrives, the epsps add together, producing

As mentioned the two EPSPs processes combine together producing a process called temporal summation The first procedure is fast in process where as the second procedure awaits the arrival of second EPSPs unlike in spatial summation, where the processes occurs in different phases.

the glands which are associated with each description is given below:

pancreas - is an endocrine and exocrine gland that secretes juices with enzymes for digestion. salivary glands- with protection and digestion in the mouth. liver- secretes bile for digestion.   lachrymal glands - secrete tears to moisten eyes and protect them from particles and infection.   sweat gland -regulates water, salt, and temperature. oil glands - to form a protective barrier on the skin.   goblet cells - secrete mucus for protection.