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USPshnik [31]
3 years ago
14

What connective tissue structure forms a sheath around an entire nerve?

Biology
1 answer:
Yuri [45]3 years ago
3 0
Its is the epineurium
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Briefly describe how amniocentesis and chorionic villi sampling are used in genetic screening.
bearhunter [10]

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%.

3 0
3 years ago
Describe how gametogenesis in egg cells is different that that of sperm cells
Dmitry [639]

Answer AND Explanation:

Gametogenesis is the formation of gametes. Formation of sperms also called spermatogenesis takes place in the testes while formation of eggs also called oogenesis takes place in the ovary. Oogenesis in females begins before birth, however maturation of the eggs take a very long time and is only complete after fertilization. In males sperm formation only occurs after puberty.

7 0
3 years ago
When tissues are subjected to chemical or physical trauma or invasion by pathogenic microorganisms, what can occur?
777dan777 [17]

Answer:

Inflammation

Explanation:

Inflammation is an immune response produced in the body in response to the damage or trauma caused by physical or chemical factors.

The injured tissue can allow the entry of the microorganism in the body which could cause disease therefore the immune response gets activated to eliminate the pathogen.

The inflammation is marked by the swelling and redness in the injured portion due to the increased flow of blood carrying the White blood cells in that area. The immune cells interact with the pathogen and kill the pathogen.

Thus, Inflammation is the correct answer.

5 0
3 years ago
bomb investigators will search the entire crime scene in an attempt to find any detonating mechanism or other evidence. true or
Sunny_sXe [5.5K]
True. By the name itself, those are the things they are supposed to do.
3 0
3 years ago
Read 2 more answers
What colors make up the visible spectrum?
SCORPION-xisa [38]

Answer:

Red, Orange, Yellow, Green, Blue, and Violet.

3 0
3 years ago
Read 2 more answers
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