Question

Can anyone please answer this question.

"Write notes on small intestine of human".

Answer 1

$\bold {small\:intestine}$

________

★The small Intestine is a narrow tube, about 6 meter long in a living adult.

★It is the longest part of alimentary canal.

★It comprises three parts:

■duodenm
__________

it follows the stomach. It is somewhat C shaped and about 25cm long.

■Jejunum
__________

The jejunum is the middle part of the small Intestine. It follows the duodenum and is about 2.4cm long. It's wall is thinner and more vascular than that of ileum.

■Ileum
_______

the ileum forms the lower part of the small Intestine. It is about 3.6 metres long and opens into large intestine. It's wall is thinner and less vascular than that of the jejunum.

___________________

The small Intestine serves 2 main functions-

◆completion of digestion and absorption of digested food.

◆ It also secrets some hormones such as cholecystokinin,secretin,duocrinin, villikinin, enterocrinin, enterogastrone.

___________________________________

Answer 2

HEYAA DEAR LOVELY FRIEND✌

HERE IS YOUR ANSWER⤵

⭐Small Intestine is distinguished into three regions:
1. Duodenum.
2. Jejunum.
3. Ileum.

✔The wall of intestine has thin layers of longitudinal and circular muscles.

✔Mucosa has folds called Plicae circulred and villi toward the lumen of the intestine.

✔Epithelial cells lining the villi have microvilli which further increases the absorptive area.

✔Intestinal glands or crypts of lieberkuhn have:
⭐Epithelial cells which secretes mucus.
⭐Paneth cells which secrete digestive enzymes.
⭐Argentaffin cells which probably secretes hormones.

✔In duodenum, Brunner's Glands are also present which secretes mucus.

✔Diffused patches of lymphoid tissues are present throughout the small intestine and aggregated in ileum to form Payer's Patches.

HOPE IT HELPS YOU!!!!⤴

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