Of the dozens of neurotransmitters that have been discovered, how many appear to be especially important in mental disorders?

Of the dozens of neurotransmitters that have been discovered 4 appear to be especially important in mental disorders.

Explanation:

The signal from one neuron is passed to another neuron with the help of a neuron transmitter. The signal that is produced by one neuron must be responded by another neuron. The receptor of neuron are bounded by the neuron transmitters.

Pre synaptic neurons are those that helps in releasing the neuron transmitters. Postsynaptic neurons are those that are helpful in receiving these neuron transmitter signals. The signals that are also released by neurons in the direct that are in reverse to the above mentioned steps. In metal disorders 4 neuron transmitters are considered to be very important.

fertilization, pictured in figure 24.23a is the process in which gametes (an egg and sperm) fuse to form a zygote. the egg and sperm each contain one set of chromosomes. to ensure that the offspring has only one complete diploid set of chromosomes, only one sperm must fuse with one egg. in mammals, the egg is protected by a layer of extracellular matrix consisting mainly of glycoproteins called the zona pellucida. when a sperm binds to the zona pellucida, a series of biochemical events, called the acrosomal reactions, take place. in placental mammals, the acrosome contains digestive enzymes that initiate the degradation of the glycoprotein matrix protecting the egg and allowing the sperm plasma membrane to fuse with the egg plasma membrane, as illustrated in figure 24.23b. the fusion of these two membranes creates an opening through which the sperm nucleus is transferred into the ovum. the nuclear membranes of the egg and sperm break down and the two haploid genomes condense to form a diploid genome.

explanation: