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ale4655 [162]
4 years ago
8

A 40-year-old multigravida's pregnancy is confirmed at 8 weeks' gestation. she says, "i can't wait another 2 months for an amnio

centesis to find out whether my baby has a chromosomal anomaly like my first child." the nurse responds that she can have chorionic villus sampling (cvs) between the tenth and twelfth weeks; what is true about this test if it is performed before this time?
Biology
1 answer:
daser333 [38]4 years ago
4 0

There are high risk of following abnormalities or mis- happening if chorionic villus sampling (CVS)  are performed before 10th week of pregnancy:

a) Fetal defects

b) Miscarraige

c)  Fetal anomalies.

d) Risk of infection

As per the standard recommended by American Congress of Obstetricians and Gynecologists, the standard time to perform this test is between 10th & 12th week as at that time the chances of risk to fetus is very negligible. In no case CVs shall be conducted before 9th week of gestation.  

It is estimated that there is a risk of 0.5 to 1 % of miscarriage after CVs which usually happens within the 3rd day of test.  

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Lipids in a bilayer can diffuse laterally at a relatively fast rate, but \"flip-flop\" from one leaflet to the other very slowly
natima [27]

Answer:

  • flippases translocate lipids from outer (extracellular) leaflet to inner (cytosolic) leaflet,
  • floppases, move phospholipids from inner (cytoplasmic) leaflet to outer (extracellular) leaflet, ABC transporter, move phospolipids across the lipid bilayer down the concentration gradient
  • scramblases Not ATP-dependent, Activation may result in increased membrane lipid symmetry, translocate phosphatidylserine,  preventing apoptosis and engulfment by macrophages,  

Explanation:

Flipases are transportes that require energy for their functioning (ATP dependent) beause they move phospolipids across the lipid bilayer against the concentration gradient  (from extracellular side to cytosolic side).

Floppases are ABC transporters, opposite than flippases (move phospholipids from the cytosolic side).

Scrablases are bidirectional transporters, responsible for asymmetry formation. It also enables exposure of phosphatidylserineon the outer leaflet when it is necessary.

6 0
3 years ago
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ikadub [295]
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5 0
3 years ago
Embryonic development includes all of the following except
Thepotemich [5.8K]

The answer is (b.) fertilization

The fertilization is the stage where the egg cell or the so-called ovum fused with the sperm cell which eventually leads the development of the embryo or the zygote. The Embryogenesis starts when the zygote undergoes mitotic divisions or also known cleavage process.

6 0
4 years ago
Botulism is a disease that causes vomiting, stomach pain, coughing, and muscle weakness. What systems would be most affected by
shutvik [7]

Answer:

A. the digestive, muscular, and respiratory

Explanation:

Muscle weakness affects the muscular system (muscles are in the muscular system) , stomach pain affects the digestive system (stomach is a part of the digestive system), and coughing affects the respiratory system (coughing hinders the ability to breathe properly).

8 0
3 years ago
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Two organisms have analogous structures. A student concluded that these organisms must have a common ancestor is the student cor
arsen [322]

Answer:

The student is wrong, just because the analogous structures of any two organism may have the same structure or even have the some relation between there way of operation or functions.

Explanation:

  • <u>Analogous Structures:</u>

As the similarity between two or more different organisms structure or any organ does not means that they have same ancestors or have the common origin from which the evolve into two different species. Now analogous structures are very much similar in there structure physically, but two different organisms may use them for the same function, which is astonishing to see or observe in way different species.

  • <u>For example:</u>

As the structure of the flipper of a Dolphin has similarity with the phalanges of a human being and with the wings of the bat. As all of them functions for the basic need of movement or locomotion from one point to another. While, all the three species are very much different in there features and are not the same obviously.

<u></u>

4 0
3 years ago
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