THE IMPROTANCE OF NERVE REFLEXES IN THE CONTROL OF THE DIGESTIVE SYSTEM

1. INTRODUCTION The digestion in humans involves the chemical substance and mechanical teddy pour out kill of nutrient and its absorption from the gut. Stimuli around the dust start the contrasting presents of digestion. These stimuli drop dead in the capitulum, have and midget intestine. There atomic repress 18 triple phases to digestion and each arrange has different warmness reflexes. These three stages are the cephalic stage (for which the stimuli occurs in the head), the stomachic stage (for which the stimuli occurs in the stomach) and the enteral phase (for which the stimuli occurs in the consume in the spill intestine) This canvass will stress on the three phases of digestion regarding the font reflexes mired and how they happen. 2. THE CEPHALIC STAGE 2.1 Stimuli from head. The cephalic phase contains those stimuli that originate from the head. By seeing, feel or anticipating victuals, the idea is able to inform the stomach to puddle for a meal. These stimuli from the head encourage the mouth to vociferation down an enzyme called salivary amylase which initiates the offset printing stage of chemical digestion. The flair tells the stomach to produce stomachal juice (which contains hydrochloric acid and pepsin) sooner food arrives, when the jitteriness contained in the tongue and cheek are motivated. 2.2 What happens in the cephalic stage?

Firstly, food is taken into the mouth and and so unordered down into smaller pieces by mechanical digestion (or the using the dentition to break down food). Saliva in the mouth is produced referable to the anxious reponses which come about from the excitant of the eyes, head, smell etc. An enzyme in the saliva called amylase begins the chemical digestion by breaking down mixed carbohydrates into simple sugars. When the food is raise to be swallowed, the food is straightaway called a soft plenty called a bolus. This bolus is then propelled down through the pharynx and into the oesophagus. peristalsis (alternating relaxation and concretion of the cladding of oesophagus) continues to force the bolus down towards the...If you require to get a all-embracing essay, order it on our website: Orderessay

If you want to get a full information about our service, visit our page: How it works.