exact 20 sentences about human alimentary canal. please. I will mark the best answer.
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Answer:
The digestive system starts with the mouth, followed by the food pipe or oesophagus that opens into the stomach. The stomach secretes acid and powerful enzymes that continue the process of breaking the food down into simpler substances. From there, food moves to the small intestine, which is made up of three segments, i.e., the duodenum, jejunum, and ileum.
Enzymes released by the pancreas and bile from the liver are poured in here. The duodenum is largely responsible for the continuing breakdown process, with the jejunum and ileum being mainly responsible for the absorption of nutrients into the bloodstream. The colon (large intestine) is a five to the seven-foot long muscular tube that connects the small intestine to the rectum. It is made up of the cecum, the ascending (right) colon, the transverse (across) colon, the descending (left) colon and the sigmoid colon, which connects to the rectum. The large intestine is a highly specialized organ that is responsible for processing waste so that defecation (excretion of waste) is easy and convenient through the anus.
So, the correct answer is option D
Explanation:
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The alimentary canal is a muscular tube, which extends from the mouth to the anus. The human digestive system comprises mouth, pharynx, oesophagus, stomach, small intestine, large intestine, and anus.
The human alimentary canal has following main parts: Mouth: Alimentary canal starts from the mouth and ends in the anus. Mouth opens into a chamber or cavity called buccal cavity.
The buccal cavity contains teeth, tongue and salivary glands.
The teeth cut the food into small pieces, chew and grind it.
Oesophagus: Buccal cavity opens into pharynx which leads to a long tube called oesophagus.
Oesophagus is also known as food pipe.
The walls of Oesophagus are highly muscular. Digestion does not occur in the Oesophagus.
It carries the food down into the stomach. Stomach: Stomach is a bag-like organ.
Highly muscular walls of the stomach help in churning the food.
Small intestine: It is a highly coiled tube-like structure.
The small intestine is longer than the large intestine but its lumen is smaller than that of the large intestine.
The small intestine is divided into three parts, viz. duodenum, jejunum and ileum.
In humans, small intestine is the site of complete digestion of food like carbohydrates, proteins and fats.
Large Intestine: Undigested food goes into the large intestine.
Anus is the opening at the end of the alimentary canal through which undigested food is thrown out.
The alimentary canal performs the function of digesting food.
It breaks it down to smaller pieces and aids in the absorption of the digested food.
The mucous membrane-lined tube of the digestive system that extends from the mouth to the anus and through which food passes, digestion takes place, and wastes are eliminated; it includes the pharynx, esophagus, stomach, and intestines. alimentary tract digestive tract.
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