<span>Neuroendocrine cells of the hypothalamus release releasing hormones into the bloodstream.</span>
Releasing or hypothalamic hormones have a stimulatory or inhibitory effect on the release of the pituary hormones. The main hormones are:
<span><span>· </span>Gonadotropin-releasing hormone (GnRH) stimulates the pituitary to release gonadotropin.
</span> <span><span>· </span>Thyrotropin-releasing hormone (TRH) stimulates the pituitary to release thyrotropin.</span>
<span><span>· </span>Growth hormone–releasing hormone (GHRH) stimulates the pituitary to release somatotropin.
</span> <span><span>· </span>Corticotropin-releasing hormone (CRH) stimulates the pituitary to release corticotropin.</span>
<span><span>· </span>Somatostatin which inhibit the release of somatotropin from pituitary and inhibits the release of some gastrointestinal hormones.</span>
Answer:
The correct answer would be 30 million years.
The molecular clock is a technique used to determine the time when the two species diverged from a common ancestor. It uses the mutation rate to determine the same.
Mutation rate is the rate at which a number of mutations take place in a given unit time.
For example, the mutation rate in a given question is one mutation per 10 million years, that is, one nucleotide is mutated in 10 million years.
If we compare the DNA sequence of the given two species, we would find that three mutations have taken place.
Species A: CTTAAGCTAGTAAGGACC
Species B: CATAAGTTAGTAAGGTCC
Thus, 30 million years would have passed to evolve three mutations.
Hence, they must have shared a common ancestor around 30 million years ago.
Answer:
The thyroid gland increase in size.
Explanation:
Iodine plays an important role in the generation of thyroid hormones and is mainly found in the soil in coastal areas and in seawater. In the developing nations, the individuals who live at high elevations or inland are generally deficient in iodine and can develop a condition known as goiters.
In the condition, the thyroid gland increases in size in an attempt to get more iodine. However, in the countries where iodine is added routinely to foods and table salt, the lack of dietary iodine is not the typical reason of goiters.
Answer:
Two groups of proteins called cyclins and cyclin-dependent kinases (Cdks), are responsible for the progress of the cell through the various checkpoints. The levels of the four cyclin proteins fluctuate throughout the cell cycle in a predictable pattern
Explanation:
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