Grade 11 Exam > Grade 11 Videos > Biology for Grade 11 > Alimentary Canal: Digestion & Absorption
Alimentary Canal: Digestion & Absorption Video Lecture | Biology for Grade 11
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FAQs on Alimentary Canal: Digestion & Absorption Video Lecture - Biology for Grade 11
| 1. What is the function of the alimentary canal in digestion and absorption? |  |
Ans. The alimentary canal, also known as the digestive tract, plays a crucial role in both digestion and absorption of nutrients. It is a long tube-like structure that spans from the mouth to the anus and includes organs such as the esophagus, stomach, small intestine, and large intestine. The functions of the alimentary canal include breaking down food into smaller particles, mixing it with digestive enzymes, absorbing nutrients into the bloodstream, and eliminating waste products.
| 2. How does digestion occur in the alimentary canal? | |
Ans. Digestion in the alimentary canal involves the mechanical and chemical breakdown of food. The process begins in the mouth, where food is chewed and mixed with saliva, containing digestive enzymes like amylase. The food then travels down the esophagus into the stomach, where it is further broken down by stomach acid and digestive enzymes. Next, the partially digested food enters the small intestine, where it is mixed with enzymes from the pancreas and bile from the liver to break down carbohydrates, proteins, and fats. Finally, the nutrients are absorbed into the bloodstream through the walls of the small intestine.
| 3. What are the main organs involved in absorption in the alimentary canal? | |
Ans. The main organs involved in absorption in the alimentary canal are the small intestine and large intestine. The small intestine is the primary site of nutrient absorption. It has a large surface area due to the presence of villi and microvilli, which increase the absorption efficiency. The small intestine absorbs nutrients such as glucose, amino acids, and fatty acids into the bloodstream. The large intestine, on the other hand, mainly absorbs water and electrolytes, while also playing a role in the absorption of certain vitamins produced by gut bacteria.
| 4. How does the structure of the alimentary canal facilitate digestion and absorption? | |
Ans. The structure of the alimentary canal is well-suited for digestion and absorption. The inner lining of the canal is made up of specialized cells that produce mucus, enzymes, and hormones necessary for digestion. The presence of folds, villi, and microvilli in the small intestine increases the surface area available for nutrient absorption. Additionally, the walls of the intestine are lined with tiny blood vessels and lymphatic vessels, allowing for the efficient transport of absorbed nutrients into the bloodstream.
| 5. What are some common digestive disorders that can affect the alimentary canal? | |
Ans. There are several common digestive disorders that can affect the alimentary canal. Examples include gastroesophageal reflux disease (GERD), which occurs when stomach acid flows back into the esophagus, causing heartburn; peptic ulcers, which are sores that develop on the lining of the stomach or small intestine; irritable bowel syndrome (IBS), a chronic disorder characterized by abdominal pain, bloating, and changes in bowel habits; and Crohn's disease, a type of inflammatory bowel disease that causes inflammation in the digestive tract, leading to symptoms such as diarrhea, abdominal pain, and weight loss.
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Nov 22, 2024 Last updated |
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