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Explain about the Intestinal calcium absorption?
Intestinal calcium absorption is mainly controlled by the serum concentration of 1, 25- (OH)2D as discussed above. The activity of the 1-α-hydroxylase, which catalyzes 1, 25-(OH)2D production from 25-hydroxyvitanlin D (25-OH-D) in the kidneys, is negatively related to plasma calcium and phosphate concentrations and positively related to plasma parathyroid hormone concentrations. Thus, the inverse relationship between calcium intake and fractional absorption described above is enhanced by the inverse relationship between dietary calcium and serum 1, 25-(OH)2D. We will learn about this aspect later in this section under the heading regulation of Ca concentration.
Explain Doctrine of Signatures? Handed down from the ancients, and elaborated on by the herbalists, was the 'Doctrine of Signatures', which was based on features that resembled
Explain the changes in cell wall and intercellular structure As a result of changes in the cell wall and intercellular structure, all fruits and vegetables undergo softening wh
What is the meaning of Darwin's expression "descent with modification"? Descent with modification refers to natural selection. Descent with modification refers to evolutionary chan
Explain process of Selection of taxonomic characters Selection of taxonomic characters Eventually classification systems may be based almost entirely on direct study of th
Provide supporting evidence to explain how conversion of a normal somatic cell into a malignant one requires multiple mutations.
The Svalbard ptarmigan (Lagopus mutus hyperboreus) is a small herbivorous bird that lives permanently on the island chain of Svalbard. Svalbard is located in the Arctic Circle, app
TYPE S OF LYSOSOMES (1 ) Primary Lysosomes or storage granules or protolysosome - The primary lysosomes are smaller in size, they contain hydrolytic enzyme in the form
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Locomotion in Echinodermata Locomotion in echinoderms is accomplished through a unique canalicular system which is termed as the water-vascular system. This system is charact
Processes in Succession - Ecology Whether succession is primary or secondary, in terrestrial or aquatic ecosystems, the basic processes involved in succession are similar. The
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