Senior Bio Notes Pt 1.docx - 1 Overview of the Digestive System a Digestive system organs i Alimentary canal those organs that act on food mechanically

Senior Bio Notes Pt 1.docx - 1 Overview of the Digestive...

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1. Overview of the Digestive System a. Digestive system organs: i. Alimentary canal - those organs that act on food, mechanically and chemically , so that it can be absorbed and provide a continuous supply of water, electrolytes, and nutrients for the body: mouth → anus. ii. Accessory organs - include the salivary glands, tongue, teeth, pancreas, gallbladder, and liver. b. Digestive processes: i. Ingestion - the process of taking food into the digestive tract; usually through the mouth . ii. Propulsion - processes that move food through the alimentary canal; includes swallowing and peristalsis. iii. Mechanical digestion - the physical preparation of food by chewing / mastication, mixing food with saliva, churning, and mixing in the stomach, and segmentation or rhythmic local constructions of the intestine. iv. Chemical digestion - a catabolic process in which large food molecules are broken down into their building blocks , to be absorbed by the body; included break down by water = hydrolysis and a variety of glands secreting specific enzymes.
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