Essays on Orexin

Describe how a nerve impulse is transmitted from one neuron to the next

The transmission from one neuron to another is characterized by exchange of electric charge across the membrane of each neuron (Fields, 2014). An unstimulated neuron would be polarised (McCance 2014). In the polarized state, there is difference in the electric charge across the membrane. However, during exchange, a neuron is said to undergo polarization, wherein there is an excess of Na+ (sodium ions) outside and excess of K+ (potassium ions) on the outside (Fields, 2014). Nerve impulse is transmitted through the process of polarization, repolarization, and hyperpolarization (McCance 2014).

Compare the structure and functions of the CNS and PNS.

The nervous system comprises of the central nervous system (CNS) ...

Narcolepsy is such a neurological disorder, the impact of which affects a person's ability to control its own state of wakefulness and sleep. The symptoms of narcolepsy are accompanied by excessive sleepiness and are not subject to control by the attacks of sleep that occur during the day and are somewhat dangerous. For example, sudden sleep attacks can occur at any time and for any actions. As a result, it becomes difficult to concentrate on sick people and they cannot work normally. (Chokroverty, Sudhansu) The cause of narcolepsy is still unknown, but there are many versions. For instance, scholars ...