Human biology question(s)?

Question

1. Where would you find cells with cilia (in human body)? And where would you find cells w/ flagella in human body?

2. At which point in meiosis is the number of chromosomes reduced in half?

3. How does the heimlich maneuver work?

Answer 1

1. Ciliated cells are found in the lining of the respiratory tract, in the inner ear and at the opening of the fallopian tube. I think the only cells will flagella are sperm cells.

2. Meiosis I is the division that reduces the chromosome number by half.

3. It just forces air out of the lungs which pushes any obstruction out.

Answer 2

1. Cilia are little hairs that can be used for absorption or can push things along. You find them in the intestines, as they help aid digestion by increasing surface area.
Flagella propel the cells along. The only place I can think of with flagella (that are human cells) are sperm cells, though there are probably more.

2. Chromosome number is reduced by half at meiosis II. Meiosis I double the # to 92, then it splits it again back to 46 (diploid cells still). Meiosis II splits it again to 23 (does not undergo chromosome replication before splitting). This produces sex cells/gamets.

3. The Heimlich maneuver, or abdominal thrusts as more properly called, forces air from the stomach up through the esophagus in order to force any foreign objects (like food) out.

Answer 3

1. As far as I know, you would only find cells with cilia or flagella within the gastrointestinal tract, becaue such cells are free-living

2. The chromosomes are reduced to half during anaphase/telophase of Meiosis I, because at that time the homologous pairs are separated and drawn toward opposite poles of the cell.

3. The Heimlich manuever works by forcing air from the lungs to dislodge something stuck in the throat. The person administering the maneuver places his/her arms around the choker, forms a fist, grasps it in the opposite hand, and forces it against the choker's midriff in a bear hug. The pressure of the fist against the midriff expels air from the lungs, dislodging the object.

Answer 4

1. cilia - if orgot what that was
flagella are usually found on bacteria or other organisms which need to move, flagella are like legs
2. use the internet
3.it forces the diaphram to push up on the bottom of the lungs and as a result the lungs push air out through the windpipe and dislodges anything that's stuck. pushing too hard in the wrong place may break a soft portion of the rib cage