Final answer:
The form of signal in all neurons is primarily chemical, as neurotransmission occurs through the release of neurotransmitters at synapses. Sensory transduction also involves converting stimuli into chemical signals via the nervous system. Neurons are classified in various ways, including based on the chemicals they use for communication.
The correct option is c. primarily chemical in all neurons
Step-by-step explanation:
While there are multiple classes of neurons, the form of signal is primarily chemical in all neurons. This is because the signals between neurons occur at the synapses, where chemicals known as neurotransmitters are released. These neurotransmitters are then received by the second neuron's dendrites, or in some cases, its axon terminals. For instance, in a chemical synapse, the signal is transmitted from neuron A to neuron B via the release of neurotransmitters.
It is also important to note the process of sensory transduction, where all types of senses convert a stimulus into a chemical signal, which is then relayed by the nervous system. Moreover, neurons can be specialized based on various classifications such as their location, who discovered them, and the chemicals they use to communicate, like in the case of Purkinje cells.
In reference to the neuron functions, neuron A's axon would travel down to the spinal cord to meet neuron B, forming a chemical synapse in the spinal cord. The nerve that carries the axon of neuron B to a skeletal muscle and is part of the peripheral nervous system (PNS), is classified as an efferent nerve because it is carrying signals away from the central nervous system (CNS) towards the effector muscles.
The correct option is c. primarily chemical in all neurons.