Question

i) What are three different pathways of glucose break down in respiration
ii) What is dual role of intestine in nutrition​

Answer 1

Answer:

I) Cellular respiration is a metabolic pathway that breaks down glucose and produces ATP. The stages of cellular respiration include glycolysis, pyruvate oxidation, the citric acid or Krebs cycle, and oxidative phosphorylation.

2)The GI tract evolved to facilitate the transport of nutrients ... to play a negligible role in the intestinal SO42− absorption.

Explanation:

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Answer 2

Answer:

Cellular respiration is a metabolic pathway that breaks down glucose and produces ATP. The stages of cellular respiration include glycolysis, pyruvate oxidation, the citric acid or Krebs cycle, and oxidative phosphorylation.

It is well accepted that the intestinal absorption of calcium occurs by 2 distinct mechanisms, a saturable active transport process and a nonsaturable passive diffusion process. The relative importance of these 2 processes and their vitamin D dependency was the subject of recent communications to this Journal. McCormick (1), in an Issues and Opinion statement, put forth the view that calcium absorption under normal conditions occurs primarily by a saturable process requiring vitamin D. Bronner et al. (2) countered with the view that the major mode of calcium absorption is by vitamin D–independent passive diffusion and not by active transport. Bronner et al. (2) further stated that in the ileum all calcium is absorbed by the passive route which, as stated before, they consider to be a vitamin D–independent process. McCormick (1) agreed that absorption by passive diffusion is independent of vitamin D. Contrary to the aforementioned views, evidence is presented suggesting that the ileum, where most of dietary calcium is absorbed, can absorb calcium by a vitamin D–dependent active process, and that the passive diffusion process of calcium absorption can be positively affected by vitamin D.