Answer:
Amniocentesis is an invasive method that involves the aspiration of 10-20 ml of fetal water through the abdominal wall under ultrasound-guided control. In most cases, the procedure is performed around the 16th week of gestation. The fetal water sample contains fetal cells, mostly cells of fetal skin and the epithelium of the urinary tract.
Chorionic Villus Sampling (CVS) biopsy is performed between weeks 11 and 12 of gestation. During biopsy, with ultrasound guidance, the tissue of the chorionic fossa is aspirated mainly across the abdomen (transabdominal pathway). The biopsy specimen is of fetal origin and belongs to the outer layer of blastocyst cells or the trophoblast (outer layer of the placenta). Very often, the biopsy specimen contains tissue of the decidua (mucous membrane of the uterus) that is of maternal origin, and it is necessary to remove the maternal tissue before any treatment of the sample.
Explanation:
The amniocentesis procedure carries a risk of miscarriage of 0.5-1%. After aspiration of the fruit of the water, the sample is centrifuged to separate the cells from the amniotic fluid. Separate cells are seeded on a nutrient medium (cell culture) that stimulates cell growth. After about 14 days, the cell culture is further used for various genetic or biochemical analyzes such as karyotyping.
The advantage of chorionic biopsy is the amount of biological material, which is sufficient for the whole a number of different laboratory procedures. Also, a great advantage is the timing of the procedure as it allows diagnosis in the first trimester of pregnancy, but the chorionic biopsy procedure itself carries a risk of miscarriage of 1-2%.
Complete question: A hydrophilic peptide hormone is produced in the anterior pituitary gland located at the base of the brain. The hormone targets specific cells in many parts of the body.
Which of the following best explains a possible mechanism that would enable the hormone to efficiently reach all of the target cells in the body? answer choices
A. The hormone interacts with the nerves at the base of the brain and directs signals to the target cells through the nervous system.
B. The hormone diffuses into target cells adjacent to the anterior pituitary gland, where the hormone is degraded.
C. The hormone is released into the bloodstream where it can be transported to all cells with the correct receptors.
D. The hormone moves through cytoplasmic connections between cells until it has reached all cells with the correct intracellular binding sites.
Answer: (C) The hormone is released into the bloodstream where it can be transported to all cells with the correct receptors.
Explanation: Hydrophilic peptide hormone is secreted in the anterior pituitary gland, which is in a form of chemical signals or ions. These signals are secreted into the bloodstream (duct) and are passed through the blood to get to a target organ, which possess cells signalling the appropriate receptor that binds to the chemical messenger (ligand), then signal transduction is established.
Student X hears the alarm first because sound travels faster in solids than in gases.
<h3>Speed of sound</h3>
Sound is a wave, as such, sound waves are able to travel across long distances. The speed of sound is greatest in solids since the gases have a high density owing to the fact that the molecules are closely packed.
Now, we can infer from this that student X hears the alarm first because sound travels faster in solids than in gases.
Learn more about speed of sound: brainly.com/question/15381147
Answer:
Explanation:
Natural product should be encouraged against chemicals this include vinegar, citric acid from citrus fruits and bicarbonate of soda.
The use of right lightbulbs helps conserve energy at home.
A recycle bin makes the environment more confortable as it helps recyle some waste product such as paper, bottles, jar .
Schools should use fluids, non toxic chemicals that are environmental friendly for cleaning in the school
The use of plastic should be reduced in lunchroom to make the environment condusive and less of plastic waste
The schools should plant trees in the environment to encourage fresh air ansd allow for carbon fixation.