Question

create a concept map to show how an electrical signal is sensed by the nervous system and transferred into synapses that the brain reads.

Answer 1

A signal is transferred to a neuron in the form of an electrical impulse known as an action potential which then moves from the dentrites of the neuron to the axon terminal.

Neural pathway is the connection formed by axons that project from neurons to make synapses onto neurons in another location, to enable a signal to be sent from one region of the nervous system to another.

Neurons are connected by a single axon, or by a bundle of axons known as a nerve tract.

Descending motor pathways of the pyramidal tracts travel from the cerebral cortex to the brainstem or lower spinal cord.

Ascending sensory tracts in the dorsal column–medial lemniscus pathway carry information from the periphery to the cortex of the brain.

Transmission of chemical signals across  the synapse is initiated when an action potential arrives at the axon terminal of the presynaptic neuron.

The change in membrane potential leads to the opening of voltage-gated calcium channels in the presynaptic membrane.

Impulse signalling pathways:

Stimulus - received by receptors - dentrite of sensory neurones - cell body-axon - synapse- dentrites of other neuron - cell body - various neuron - central nervous system - dentrite of motor neuron - cell body - axon - effector.