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3 years ago

From where do the placenta and umbilical cord develop?

Biology

2 answers:

Katen [24]3 years ago

4 0

Answer:

The correct answer is ''outer cells of the blastocyst'' The placenta and umbilical cord will derive from the trophoblast and from the internal cell mass all the tissues that will form the embryo.

Explanation:

The umbilical cord and the placenta are two fundamental organs for the development of the fetus, both come from the same initial cell as the fetus and for this reason they share a lot of genetic information with it. The placenta joins the wall of the uterus which is where the umbilical cord arises. As a general rule, it is attached to the upper, lateral, anterior or posterior part of the uterus. In some rare cases, the placenta can join the lower uterus, causing what is called placenta previa. The placenta begins to form at the same time that the fertilized ovum implants in the wall of the uterus and is essential for the correct development of the embryo, since it is through it and the umbilical cord to which it is subject that the fetus maintains the connection with the mother and receives all the nutrients it needs, in addition to the blood and oxygen it needs to breathe. The outer part of the placenta comes from the transformation of the uterus mucosa, while the inner part, called trophoblast, is configured from the embryo's own blasts, establishing a complex network of blood vessels, through which the fetus you will receive the nutrients you need. Also from the trophoblast, the chorionic plate is formed, in which the chorionic villi are located, which allow the embryo to attach to the wall of the uterus.

Salsk061 [2.6K]3 years ago

4 0

Answer:

outer cells of the blastocyst

Explanation:

on edg:)

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1.quinine medicine is used for 2 points

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Answer:

This medication is used alone or with other medication to treat malaria caused by mosquito bites in countries where malaria is common. Malaria parasites can enter the body through these mosquito bites, and then live in body tissues such as red blood cells or the liver.

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3 years ago

suppopse you were going to deisgn a system for the rapid diffusion of oxygen across a phosphlipid bilayer. according to fick's l

Llana [10]

Answer:

According to Fick's law, the rate of diffusion of any substance across any barrier is directly proportional to the surface area of the membrane or any layer exposed. and the concentration of the diffusing substance available, but the rate is inversely proportional to the diffusion distance available.

Thus the rate at which oxygen will move across the phospholipid bilayer will depend on the concentration or amount per mole of the oxygen molecule hitting the phopholipid at a prticular time and how permeable the phospholipd layer is to oxygen molecules, but the rate of its movement across will be reduced as the distance between the phosphoslipid bilayer and the diffusing molecules increases.

Therefore, the concentration of oxygen should be maximised, the surface area of the phospholipid bilayer should also be maximized. the distances between the phopholipid and the vessel containing the diffusing oxygen molecules should be drastically reduced. With this Fick's law has been applied , and therefore maximum oxygen molecules can diffuse across.

Explanation:

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3 years ago

Alcohol stimulates the release of _____, the brain's major depressant.

Kaylis [27]

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3 years ago

A client is experiencing kidney failure. which is the most serious complication for which the nurse must monitor a client with k

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4 years ago

In the seawolf (a rare hypothetical animal), the dominant allele R causes solid tail color, and the recessive allele r results i

Ratling [72]

Answer:

The most likely genotype of the male parent is RrBbmm.

Explanation:

First of all, we have 3 genes and 6 alleles:

For color pattern:

- RR or Rr: Solid tail color

- rr: Spotted tail

For coat color:

- BB or Bb: Black coat color

- bb: Brown color

Expression of gene B/b depends on M:

- MM or Mm: B/b is expresed.

- mm: B/b is not expresed, yellow coat.

So, a cross between a solid yellow-tailed male and a solid brown-tailed female was made, and the offspring was:

- 6 solid yellow

- 2 spotted yellow

- 3 solid black

- 1 spotted black

- 3 solid brown

- 1 spotted brown

Total: 16

If it was produced all possible phenotypes, it means that parents have to be carriers of R/r, B/b, and M/m alleles. Male parent is yellow, so he has to be mm for this gene, but for the two other alleles he should be heterozygous:

RrBbmm

And female parent is solid brown-tailed, so she has M allele, (probably heterozygous), and Rr and bb (color brown),, like this:

RrbbMm

When these two genotypes are crossed, 8 gametes are generated for each parent, and 64 possible combinations. This cross in the attached Punnett Square.

As a result, the phenotypicial ratios are in the attached table and they are the same as the reported in the question:

Punnett Square

- 24 (6) solid yellow

- 8 (2) spotted yellow

- 12 (3) solid black

- 4 (1) spotted black

- 12 (3) solid brown

- 4 (1) spotted brown

Total: 64

7 0

4 years ago