Question

through the nervous system. impulse wakes up the nervous system. include where the impulse starts, how it travels, and what happens at different parts of the nervous system.

Explanation:

This description is based on the fundamental principles of neural communication in the nervous system. Receptors detect stimuli, neurons transmit impulses, and synapses allow for communication between neurons. The central nervous system is the processing center for these impulses.

Answer:

The nerve impulse typically starts at a receptor (such as a sensory receptor in the skin, eyes, ears etc.). It travels along a neuron as an electrical - chemical signal called an action potential. When the impulse reaches the dendrites of a neuron, it causes a change in the electrical potential across the membrane. If the threshold is reached, an action potential is generated in the axon hillock. The action potential then travels down the axon. When it reaches the axon terminal, neurotransmitters are released into the synapse. These neurotransmitters cross the synapse and bind to receptors on the dendrites of the next neuron, potentially causing the impulse to continue its journey through the nervous system. At the central nervous system (brain and spinal cord), the impulses are processed and integrated, leading to appropriate responses such as muscle contractions, glandular secretions, or cognitive functions.