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3 years ago

Why are the contents of gastric juice so hostile to the exposed duodenal wall?

2 answers:

4 0

Gastric juice is a thin strongly acidic (pH 1 - 3 ) almost colorless liquid secreted by the glands in the stomach lining. It is made acidic by one of its constituents namely hydrochloric acid. It is because of its acidic nature that gastric juice can be so corrosive to the lining of the duodenum.

The integrity of the inner lining of the (mucosa) of the duodenum depends on a careful balance of the "aggressive" factors (such as acid) and "defensive" factors (such as mucus) which helps to protect the delicate surface lining.

Disruption of this balance caused by too much acid (or weakened defense ) can result in erosions or ulcers .

zepelin [54]3 years ago

3 0

Gastric juice is a thin strongly acidic (pH 1 - 3 ) almost colorless liquid secreted by the glands in the stomach lining. It is made acidic by one of its constituents namely hydroelectric acid. It is because of its acidic nature that gastric juice can be so corrosive to the lining of the duodenum.

The integrity of the inner lining of the (mucous) of the duodenum depends on a careful balance of the "aggressive" factors (such as acid) and "defensive" factors (such as mucus) which helps to protect the delicate surface lining.

Disruption of this balance caused by too much acid (or weakened defense ) can result in erosion or ulcers .

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Why is a testcross necessary to determine genotype when an organism shows a dominant trait

soldier1979 [14.2K]

A dominant trait can be shown both when an organism is homozygous dominant AND heterozygous. Two different genotypes give the same visible result so a testcross is needed to be able to accurately say if the organism is homozygous dominant or heterozygous

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3 years ago

Bell-shaped distributions produced by plotting results of f2 and f3 crosses are typical of which type of inheritance?.

harina [27]

Plotting the results of f2 and f3 crossings resulted in Bell-shaped distributions, which represent multiple-factor inheritance.

<h3>What transpires when an inheritance ends?</h3>

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<h3>What is a bequest and why is it significant?</h3>

Evolutionary change requires the inheritance of genetic material. It explains the genetic transmission process from one generation to the next. The fact that genetic inheritance is rarely taken into account in life history research may therefore at first seem surprising.

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3 0

1 year ago

What do you call, mixtures with unsettled substances?

solong [7]

Answer:

Heterogeneous mixtures are substances not mixed together.

Explanation:

I hope that is right

4 0

3 years ago

106US Gregor Mendel performed numerous dihybrid crosses between pea plants. Dihybrid

Ivanshal [37]

Answer: 25% of the offsprings will be heterozygous for both traits

Explanation: A cross between BbFf and bbff will yield 16 offsprings with four different possible genotypes: BbFf, Bbff, bbFf, and bbff. Only BbFf is the genotype that is heterozygous for both traits, and there are four offsprings with BbFf genotype.

Therefore the percentage of the offsprings that are heterozygous for both traits is 4/16 x 100 = 25%

See the punnett square for the details of the dibybrid cross

3 0

3 years ago

Why is it important to have a large number of producers and herbivores in an ecosystem

bixtya [17]

Answer: The food chain

Explanation: It is important to have a large number of producers and herbivores in an ecosystem because of the food chain. Without producers the herbivores would have no food. and without the herbivors the carnivores would have no food.

6 0

3 years ago