LIFESCI 2N03 Lecture Notes - Esophageal Cancer, Phospholipid, Reticular Connective Tissue
10 Dec 2012
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Document Summary
2 main groups: good carbs contain fibre improves gi health bad carbs in the form of sugars contain minimal fibre: alimentary canal, gastrointestinal tract, continuous digestive tube through whole body. Lipids into fatty acids, glycerol, monoglycerides (glycerol with one fatty acid attached) Large intestine absorption is water, diameter opening of large is larger. 29: majority of this takes place in the mouth, physical preparation of food for absorption chewing, mixing food with enzymes (tongue), churning of food in stomach, stomach contracts rolls food around. Pincivero, 2012: elimination of indigestible substances through the rectal canal and anus. 31 stretching of tissue mechanoreceptors, sensory nerves, activate short reflexes. Reflexes: gastrocolic- stomach and colon- stomach distention, telling neurons there is food there sensory receptors, it stimulates colon evacuation (defecation) Enterogastric reflex- distention or irritation of small intestine will decrease stomach secretions/ activity, this reflex attempts to keep food in stomach, slow down stomach activity and give time to small intestine to absorb nutrients.
