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Arada [10]
4 years ago
7

The structure of the lungs can be compared to the structure of a branching tree. which part would correspond to the trunk of the

tree
Biology
1 answer:
Diano4ka-milaya [45]4 years ago
5 0
The trachea would be the trunk of the tree
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2 years ago
Most amines are ________, meaning they dissolve in water and therefore cannot cross the cell membrane. The ________ hormones are
Doss [256]

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 Chemical messengers can be classified by their chemical characteristics including their solubility in water and their chemical structure.  

Depending on their solubility in water they can be classified in two groups:

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Depending on the chemical structure  

Amino Acids are lipophobic.

Amines are derived from amino acids and contain an amine group (-NH2, known as the amino group). An important group of these are the catecholamines which contain a 6 carbon ring (catechol) and are derived from tyrosine. These include dopamine, norepinephrine and epinephrine. The thyroid hormone is derived from tyrosine.  All except thyroid hormones are hydrophilic. The thyroid hormone is lipophilic (hidrophobic)

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