Animal cells communicate via their extracellular matrices and are connected to each other via tight junctions, desmosomes, and gap junctions
It makes a longitudinal wave because it stretches and compresses while it slithers forward
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%.
Answer:
closer
Explanation:
The closer two objects are to each other, the stronger the force of gravity is between them.
Answer:
Pump Ca+ into the cell.
Explanation:
The pumps are used for the transportation of substances against the concentration gradient. These pumps require energy for the transportation of molecules against the concentration gradient.
The most common pump used for the transportation of calcium ions is the calcium pump. These pumps require ATPase activity and transfer calcium against the concentration gradient. The calcium ions are pumped outside of the cell and not cell inside.
Thus, the correct answer is option (b).
