HUMAN BODY PRESENTATION

science 8

digestion process

INGESTION, DIGESTION, ABSORPTION & ELIMINATION

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EXPLAIN THE DIGESTION RPOCESS

Digestion

Ingestion

Absorption

Assimilation

Elimination

1. INGESTION

The first activity of the digestive system refers to the entry of food into the alimentary canal through the mouth. The presence of food in the mouth triggers a nervous reflex that causes the salivary glands to deliver a watery fluid called saliva to the mouth.

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1. INGESTION

The presence of a digestive enzyme, known as amylase, in saliva allows chemical digestion of starches to begin.

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2. DIGESTION

• The food is broken down both physically and chemically.
• The process of converting complex food particles into simpler substances in the presence of enzymes and acids secreted by different digestive organs.

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TYPES OF DIGESTION

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3. ABSORPTION

The simple molecules that result from chemical digestion pass through cell membranes of the lining in the small intestine into the blood.

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4. ASSIMILATION

The process of absorbing nutrients during digestion and distributing them to the body for growth and repair.

Small Intestine

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5. elimination

The final step in digestion is the elimination of undigested food content and waste products. The undigested food material enters the colon, where most of the water is reabsorbed. The solid waste is eliminated through the anus using peristaltic movements of the rectum.

Large Intestine

Rectum

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Anus

REFERENCES:

• Baum, H.(n.d.). The Digestive System. https://www.uc.edu/content/dam/uc/ce/docs/OLLI/Page%20Content/OLLI%20-%20The%20Digestive%20System.pdf
• Begum, J. (2023, May 5). The Digestive System. WebMD. https://www.webmd.com/digestive-disorders/digestive-systemScience
• Digestive System. Cleveland Clinic. https://my.clevelandclinic.org/health/body/7041-digestive-system
• How Does Digestion Work. IBD Clinic. University of Alberta. http://www.ibdclinic.ca/what-is-ibd/digestive-system-and-its-function/how-it-works-animation/#:~:text=Digestion%20works%20by%20moving%20food,break%20down%20into%20smaller%20molecules.
• Learning Hub (2011. July 1). Digestion of food. https://www.sciencelearn.org.nz/videos/814-digestion-of-food

• Tresca, A. (2023, June 3). Parts of the Small Intestine. Very Well Health. https://www.verywellhealth.com/small-intestine-1942443

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