Question

1.) How large a voltage has to be applied to the neuron to be a threshold stimulus?

2.) Fill in the following table:

Neurotransmitter	Important synthetic enzymes	Receptor	Ionotropic/metabotropic
Acetylcholine			I
		Muscarinic
Dopamine
Serotonin
Norepinephrine	Dopamine beta hydroxylase	a	M
		b
GABA		GABA-A	I
		GABA-B	M
	Glutaminase	NMDA, AMPA/kainate	I
		mGluR	M

Answer 1

1)The neurons transmit the signals in the form of electrical pulses. When a neuron is at rest, no pulse is flowing thorugh it, this is called resting membrane potential. This is typically -70mV. When a pulse passes through it, the neuron depolarises and the volatege increases to -55mV. This is called Threshold voltage or stimulus. The action potential is not set in and it fires the signal.

2)