The small intestine is the main area of the GI tract for absorption.
The small intestine has three separate sections. Theyare :
1. The duodenum
2. Jejunum and
3. Ileum.
Hence, the majority of nutrient absorption occurs in the duodenum and jejunum of small intestine.
Steroid hormones exert their action by entering the nucleus of a cell and initiating or altering the expression of a gene.
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