The Digestive System: Phases of Digestion The first phase of digestion is called
ID: 3481967 • Letter: T
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The Digestive System: Phases of Digestion The first phase of digestion is called the List the stimuli for this phase phase The response to these stimuli. This branch in turn signals several different target organs simultaneously. When the salivary glands receive this neural input, they or decrease) the secretion of saliva. When the stomach receives this neural input, different parts of the stomach respond differently branch of the autonomic nervous system becomes more active in (increase What does the musculars of the stomach do in response to these signals? What do the gastric glands do in response to these signals? The second phase of digestion is called the phase and is stimulated by Describe how the neural signaling to the stomach and salivary glands change during this phase and the effect of this change The third phase of digestion is called the phase and is stimulated by entering the small intestine (stimulated During this phase, digestive processes in the small intestine are or inhibited) while digestive processes in the stomach are (stimulated or inhibited) Describe what stimulates this change in digestive activity of the small intestine: Describe what stimulates this change in digestive activity of the stomach What causes the digestive activity in the small intestine and stomach to reverse? (hint: it's related to pH)Explanation / Answer
The first phase of digestion is called the cephalic phase.
Stimuli for this phase: a variety of sensory stimuli including sight, smell, thought of food, taste of food.
The parasympathetic branch of the autonomic nervous system becomes more active in response to these stimuli.this branch in turns signals several different target organs simultaneously. When the salivary glands receive this input they increase the secretion of saliva.
Gastric gland secrets gastric juices in response to the stimulus . gastric juice is the main exocrine product of the stomach. It is the mixture of mucus, hydrochloric acid and digestive enzymes.
The second phase of digestion is called gastric phase and is stimulated by vagus nerve.
As the food enters the stomach, it stretches and activates stretch receptors. The stretch receptors sends message to the medulla and then back to the stomach via vagus nerve. Gastric glands secrete more gastric juices.
The third phase of the digestion is called the intestinal phase and is stimulated by chyme entering the small intestine.
During this phase digestive processes in the small intestine are stimulated while digestive processes in the stomach are inhibited.
The acid and semidigested fats in the duodenum trigger the enterogastric reflexes. The duodenum sends inhibitory signals to the stomach by enteric nervous system.
Stretching of duodenum enhances gastric function via the vagal nerve. As the chyme causes the secretion of gastrin which stimulates the stomach.
Chyme also stimulates entero endocrine cells of the intestine to release compounds that stimulates the pancreas, gall bladder while also suppressing gastric secretion.
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