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3 years ago

Is the involuntary movement of the muscles that move food through the digestive system.

Biology

2 answers:

lara [203]3 years ago

8 0

Answer:

peristalsis or however you spell it

amm18123 years ago

3 0

Answer:

Peristalsis is the involuntary movement of the muscles that move food through the digestive system.

Explanation:

Peristalsis is a reflex response.
It is initiated when the gut wall is stretched by the contents of the lumen.
Peristalsis occurs in all parts of the gastrointestinal tract from esophagus to the rectum.
It actually refers to the ringlike contraction of the circular smooth muscle that move progressively forward pushing the bolus.
It involves coordinated contraction and relaxation above and below the food bolus so that the bolus is pushed forward instead of being pushed back.

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What consumer level is a lobster

Alexeev081 [22]

The lobster would be a secondary consumer.

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3 years ago

Pure-breeding sweet peas with purple flowers and round pollen are crossed with pure-breeding sweet peas with red flowers and lon

Anestetic [448]

Answer:

C. 40

Explanation:

Pure-breeding means that the individuals are homozygous for the genes being analyzed.

From Mendel's Law of Dominance we know that the traits that appear in the F1 are the dominant ones.

I will call:

P_ = purple flowers

pp = red flowers

L_ = long pollen

ll = round pollen

Initial cross:

P Pl/Pl x pL/pL

F1 Pl/pL

Test cross (cross with a homozygous recessive individual):

Pl/pL x pl/pl

Expected progeny:

Pl/pl = Parental (purple flowers, round pollen)

pL/pl = Parental (red flowers, long pollen)

PL/pl = Recombinant (purple flowers, long pollen)

pl/pl = Recombinant (red flowers, round pollen)

20% of the offspring have purple flowers and long pollen (PL/pl).

Every time crossing over happens in the meiosis of the F1 individual, both a PL gamete and a pl gamete form. That means that 20% of the offspring will also be pl/pl, and the total proportion of the offspring that will be recombinants will be 40%.

A distance of 1 map unit corresponds to a recombinant frequency of 1%.

A recombinant frequency of 40% therefore means that 40 map units separate the glower color and pollen shape genes.

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3 years ago

If the concentration of oxygen in a body tissue cell is 5% and the concentration of oxygen in the blood surrounding the cell is

Lera25 [3.4K]

Answer:

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irina [24]

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Explanation:

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Answer:

C. The properties of the mixture may be different from those of the original substances

Explanation:

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