Describe the structure of a villus b Describe the roles of capillaries and

Describe the structure of a villus b describe the

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Describe the structure of a villus b. Describe the roles of capillaries and lacteals in villi 3. State that water is absorbed in both the small intestine and the colon, but that most absorption of water happens in the small intestine Digested food absorbed in Ileum into blood or lymph Adaptation for Efficient Absorption a) _______________________ – enough time for absorption to occur b) _______________________ with villi– large surface area for absorption Villi = thousands of finger-like projections in the ileum wall Label the structure of a villus & epithelial cells with microvilli The continuous flow of blood ensures concentration gradient of nutrient molecules is maintained.
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Fat-soluble food molecules = enters ________________ Eg: _____________________________________________ Water-soluble food molecules = enters capillaries Eg: _____________________________________________ The _______________________then delivers them to the liver. Liver: determines what and how much nutrients enter the blood stream based on body’s need. FUNCTIONS OF LIVER 1) Manufacture ________________ 2) Store excess glucose as ________________ (excess glycogen is turned into fats) 3) Interconversion of glucose and glycogen to keep glucose level in blood constant 4) ________________________ = Interconversion of different amino acids 5) _____________________ = excretion of excess amino acid in the form of urea (excreted in urine) 6) Removal of haemoglobin & store iron 7) _____________________ = Breakdown of alcohol and other toxin _____________ = process of moving food molecules into the cells to be used Each type of cells uses food molecules for different purposes. Muscle cells take certain proteins to make muscle Bone cells take calcium and phosphate All cells take glucose to produce energy via respiration
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