JAMB Exam > JAMB Videos > Biology for JAMB > Chemical & Mechanical Digestion
Chemical & Mechanical Digestion Video Lecture | Biology for JAMB
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FAQs on Chemical & Mechanical Digestion Video Lecture - Biology for JAMB
| 1. What is the difference between chemical digestion and mechanical digestion? |  |
Ans. Chemical digestion involves the breakdown of food through the action of enzymes and other chemicals, while mechanical digestion refers to the physical breakdown of food through processes like chewing and churning in the stomach.
| 2. How does chemical digestion occur in the human body? | |
Ans. Chemical digestion in the human body begins in the mouth with the action of saliva, which contains enzymes that start breaking down carbohydrates. The process continues in the stomach, where gastric acid and enzymes break down proteins. Finally, in the small intestine, enzymes from the pancreas and intestinal lining break down proteins, carbohydrates, and fats further.
| 3. What are some examples of mechanical digestion processes in the human body? | |
Ans. Examples of mechanical digestion processes in the human body include chewing, which breaks down food into smaller pieces, and the churning action of the stomach, which mixes food with digestive juices. Additionally, peristalsis, the rhythmic contraction of muscles in the esophagus and intestines, helps move food along the digestive tract.
| 4. How does chemical digestion contribute to nutrient absorption? | |
Ans. Chemical digestion is essential for nutrient absorption as it breaks down complex molecules into smaller, soluble forms that can be absorbed by the body. For example, carbohydrates are broken down into simple sugars, proteins into amino acids, and fats into fatty acids and glycerol, which can then be absorbed through the intestinal lining into the bloodstream.
| 5. Can you provide an example of a chemical digestion enzyme and its role? | |
Ans. One example of a chemical digestion enzyme is amylase. It is found in saliva and helps break down starches and carbohydrates into smaller sugar molecules. Amylase begins the process of breaking down carbohydrates in the mouth, preparing them for further digestion in the stomach and small intestine.
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Dec 24, 2024 Last updated |
Video Description: Chemical & Mechanical Digestion for JAMB 2024 is part of Biology for JAMB preparation.
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