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3 years ago

Which hormone is produced mainly in the stomach and regulates secretions of gastric juice?

Biology

2 answers:

ruslelena [56]3 years ago

5 0

The correct option is (A) Gastrin.

Stomach acts as an important organ in the process of digestion aiding both the mechanical and chemical digestion. Gastric glands are present in the walls of the stomach and help in the secretion of the gastric juice into the lumen of the stomach. The zymogenic cells or the chief cells of the gastric glands secrete the gastric enzymes and the parietal cells or the oxyntic cells secrete hydrochloric acid.

The gastric juice is an acidic digestive fluid containing the hydrochloric acid, digestive enzymes like pepsin, gastric lipase and renin, potassium chloride and sodium chloride. Secretion of gastric juice is regulated by the autonomic nervous system (peripheral nervous system that influcences the funtioning of internal organs) and hormones.

The hormone produced mainly in the stomach which regulates the secretions of gastric juice is the gastrin. It is a peptide hormone stimulating the secretion of hydrochloric acid by the parietal cells of the stomach. It also stimulates the chief cells to secrete pepsinogen which is the inactive form of the enzyme pepsin catalyzing the protein digestion.

Secretin is a hormone produced by the duodenum (part of small intestine) to stimulate the secretions of liver and pancreas. Pepsin is an enzyme helping in the digestion of proteins. Thus, gastrin is the hormone produced in the stomach regulating the secretion of the gastric juice.

lys-0071 [83]3 years ago

4 0

Hey!

ANSWER:
The hormone that is produced mainly in the stomach and also regulates secretions of gastric juice is gastrin.

EXPLANATION:
Gastrin is a type hormone that is produced by the something known as g cells. These cells become activated once a person eats food and the food travels to the stomach. The hormone is then left into what is called the bloodstream. There it starts to have an effect on some of the other cells that are in the stomach. This allows the acid of the hormone to be entered in the stomach.

Hope this helps!

— Lindsey Frazier ♥️

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An additional gene, gene W, was also examined. A test cross was made between true-breeding EEWW flies and EEWW flies. The result

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This question is incorrect but here is the correct question below;

An additional gene,gene W was also examined. a test cross was made between true breeding EEWW flies and eeww flies. The resulting F₁ generation was then crossed with eeww flies. 100 offspring in the F₂ generation were examined and it was discovered that the E and W genes were not linked.

Which is the correct genotype of the F₂ offspring if the genes were linked and if the genes were not linked?

a) Linked: 50% EeWw and 50% eeww; not linked: 25% EeWw, 25% Eeww, 25% eeWw and 25% eeww.

b) Linked: 25% Eeww, 50% eeWw; not linked:parental genotypes EeWw and eeww.

c) Linked genotypes (EeWw and eeww) and recombinant genotype ( Eeww & eeWw) in the F₂ generation are nearly the same irrespective of their linkage.

d) Linked: mostly with parental genotypes, Eeww and eeWw; unlinked: 25% EeWw and eeww with 75% Eeww and eeWw.

Answer:

a) Linked: 50% EeWw and 50% eeww; not linked: 25% EeWw, 25% Eeww, 25% eeWw and 25% eeww.

Explanation:

a test cross was made between true breeding EEWW flies and eeww flies

If EEWW self crossed, we have the following ( EW, EW, EW, EW)

Also, for eeww, we have ( ew, ew, ew, ew)

EW EW EW EW

ew EWew EWew EWew EWew

All offspring are (EWew)

The question goes further by saying "The resulting F₁ generation was then crossed with eeww flies".

And we are asked to find the correct genotype of the F₂ offspring if the genes were linked and if the genes were not linked

∴

To determine the offsprings of the linked genes we need to go by the definition and understand what linked genes are: Linked genes are genes that are physically close together on the same chromosomes. Effect of recombinantion on linked genes, results in gene swaps which occur in chromosomes that are homologous.

Having said that; If EWew × eeww

we have; EW & ew × ew & ew

EW ew

ew EeWw eeww

offspring that

are linked in ⇒ EeWw EeWw & eeww eeww

F₂ will be

$\frac{1}{2}$ = 50% of EeWw of the total 100 offspring in the F₂ cross

$\frac{1}{2}$ = 50% of eeww of the total 100 offspring in the F₂ cross

∴ Linked genes = 50% EeWw and 50% eeww.

For unlinked genes; If EWew × eeww

if rearrangement occurs in EWew and EWew self crossed, we have ( EW,Ew,eW,ew) as the traits needed for the unlinked gene F₂ crossing.

Also ewew will be (ew, ew, ew, ew).

EW Ew eW ew

ew EeWw Eeww eeWw eeww

We have the following results for the unlinked genes

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$\frac{1}{4}$ = Eeww 25% of the total 100 offspring in the F₂ cross

$\frac{1}{4}$ = eeWw 25% of the total 100 offspring in the F₂ cross

$\frac{1}{4}$ = eeww 25% of the total 100 offspring in the F₂ cross

∴ not linked: 25% EeWw, 25% Eeww, 25% eeWw and 25% eeww.

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