BIOS 20188 Lecture Notes - Lecture 24: Antiporter, Symporter, Paracellular Transport
3 Apr 2020
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Lecture 25: describe the significance of bile secretion to the absorption of fat soluble vitamins such as vitamin a, explain why na + absorption in the small intestines is critical for the absorption of water. H 2 o absorption: dependent on basolateral na/k atp-ase, creates sodium gradient that allows for sodium to enter via multiple ways i. ii. iii. iv. 2. (water follows sodium: via transcellular or paracellular, ph balance, chlorine and bicarb antiporter allows for ph balance due to the secretions of protons due to the sodium proton antiporter i. Heme is broken down into porphyrin and iron: heme transporter , dmt1 (divalent metal transporter, leave, ferroportin; when iron leaves it will bind to transferrin, or iron will not leave to bind to ferritin. Hepcidin: inhibits ferroportin: describe the significance of calcitriol and the vitamin d receptor for calcium absorption in the small intestines.
