ลำไส้เล็กทําหน้าที่อะไร
ลำไส้เล็กทำหน้าที่สำคัญมากในระบบทางเดินอาหาร กล่าวคือทำหน้าที่ย่อยและดูดซึมอาหารที่ย่อยจนกลายเป็นสารอาหารโเลกุลเดี่ยว แล้ว เช่นกลูโคส กรดอะมิโน กรดไขมันและกลีเซอรอล เข้าสู่กระแสเลือด เพื่อให้ร่างการนำไปใช้ประโยชน์ต่อไป
การย่อยที่ลำไส้เล็กถือว่าเป็นการย่อยที่สมบูรณ์และมีการดูดซึมสารอาหารจากการย่อยได้มากที่สุด
น้ำย่อยทในลำไส้เล็ก เป็นน้ำย่อยประเภทเอนไซม์ ซึ่งมีหลายชนิด ทำหน้าที่ต่างๆกันดังนี้
- เอนไซม์ไดเปปดิเดส ทำหน้าย่อยสารพวกโปรตีน Dipeptide ได้กรดอะมิโนออกมา
- เอนไซม์มอลเทส ทำหน้าย่อยสารพวก Maltose ได้กลูโคส และ Glucese ออกมา
- เอนไซม์ซูเครส ทำหน้าย่อยสารพวกน้ำตาลซูโครส และได้กลูโคส และ Fructise ออกมา
- เอนไซม์แลกเตส ทำหน้าย่อยสารพวกแลคโตส และได้กลูโคส และ Galactose ออกมา
- เอนไซม์ไลเปส ทำหน้าย่อยไขมัน ได้กรดไขมันและ Glycerol ออกมา
ลำไส้เล็กถือว่ามีความสำคัญอย่างมากในระบบการย่อยอาหาร ดังนั้นการเลือกรับประทานอาหารที่มีประโยชน์และย่อยง่ายจะช่วยให้ลำไส้เล็ก ทำงานน้อยลงได้…
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