Final answer:
A lack of neurotransmitters would cause problems because they are crucial for the transmission of signals between neurons. Insufficient neurotransmitters can lead to disrupted communication and may result in various neurological disorders. d. neurotransmitters are how signals move from neuron to neuron is correct.
Step-by-step explanation:
A lack of neurotransmitters would cause a problem in the nervous system because neurotransmitters are how signals move from neuron to neuron. Neurotransmitters are chemical messengers that carry, boost, and modulate signals between neurons and other cells in the body.
They play a major role in shaping everyday life and functions. When an action potential reaches the end of a neuron, it triggers the release of neurotransmitter molecules into a synaptic cleft. These molecules then bind to receptors on the surface of the next neuron. This binding process is crucial for the continuation of a nerve signal.
Without sufficient neurotransmitters, the nerve signal could potentially die at the synaptic junction, leading to miscommunication in the nervous system. This could manifest as physical and mental disorders, given the essential role of neurotransmitters like dopamine in neurological processes that affect a wide range of human behaviors. Conditions such as Parkinson's disease and schizophrenia are associated with dysfunctions in neurotransmitter systems.