. and occurs in the 29. Synthesis of red blood cells is called a. erythropoiesis
ID: 3515913 • Letter: #
Question
. and occurs in the 29. Synthesis of red blood cells is called a. erythropoiesis : bone marrow b. erythropoiesis : kidney c. erythropoiesis : spleen d. hemostasis : bone marrow Olympic athletes train in Colorado Springs, Colorado because this location is at high altitude and near the 14,000 foot Pikes Peak. Which statement best describes why this location was chosen? 30. Oxygen levels are low and, therefore, more red blood cells are produced, giving the athletes an advantage when competing at lower altitudes. The concentration difference for getting air into the lungs is greater at high altitudes. a. b. c. The thinner air causes it to be easier to move into and out of the lungs, which leads to higher oxygen transport. The thin air allows for less resistance when biking o athletes can run and bike faster, which builds up their endurance for future races. d. r running and, therefore, the 31. Which of the following is NOT considered to be a primary function of the respiratory system? a. regulation of water balance b. regulation of pH balance c. protection against pathogens d. vocalization e. gas exchange 32. Type I alveolar cells a. allow rapid diffusion of gases through their thin membranes. b. secrete a chemical known as surfactant. c. are phagocytic. d. allow rapid diffusion of gases through their thin membranes, secrete a chemical knowr as surfactant, and are phagocytic. None of the statements are true e. 33. Surfactant a. protects the surface of the lungs. b. phagocytizes small particulate matter. c. replaces mucus in the alveoli. d. helps prevent the alveoli from collapsing 34. What is the most abundant class of white blood cells? a. neutrophils b. basophils c. eosinophils d. monocytes e. lymphocytesExplanation / Answer
29) The term erythro is taken from erythrocytes meaning RBC- poiesis means synthesis. Therefore this means- RBC synthesis. It occurs in red bone marrow. So, option 1 is correct.
30) At high altitudes, the oxygen pressure is less- therefore less difference gradient is created between lungs and outside and as a result, less oxygen enters the lungs. The body, in order to compensate gor the decreased availability of oxygen, increases the number of RBC in blood. Therefore option 1 is correct.
However, a misconception must be avoided here. People living in higher altitudes do not have a greater RBC count. They instead have larger RBCs.
31) The respiratory system helps bicarbonate buffer to work and so maintains pH.
Metabolic water is expelled with each breath and thus it helps in maintaining water balance.
The exhaled air resonates with larynx and helps in sound production
Gaseous exchange is the basic function of this system
Therefore option 3 is correct.
32) There are two type of cells in alveoli. Type 1 cells help in diffusion of gases. Type 2 cells secrete surfactant.
Therefore, option 1 is correct.
33) Surfactant forms a thin covering inside alveoli- by the property of surface tension, it prevents alveoli from collapsing. Thus option 4 is correct.
34) Neutrophils are most abundunt amounting to 64 percent of total lymphocytes. Basophiles are 1 percent. Acidophiles are 4 percent. Monocytes are 8 percent.
Thus option 1 is correct.
35) This must be remembered as a fact thay mast cells are responsible for almost all inflammatory reactions. Therefore option 3 is correct.
36) Whenever B cells encounter a pathogen antigen- they immediately turn into plasma cells and start the production of antibodies. Thus option 4 is right.
37) The steps of phagocytosis are activation, chemotaxis, attachment and internalisation. Therefore secretion of interleukin is not involved. Interleukin is secreted by t helper cells. Therefore option 5 is right.
38) Helper T cells secrete cytokinins. Macrophages also secrete cytokinins. Cytokinins stimulate other immume cells for activation. Therefore option 1 and 3 are equally correct. If one is to be considered, option 3 may be considered true.
39) T cells are responsible for CMI. B cells mediate antibody immunity. Option 3 is right.
40) The volume of lungs increase during inspiration. The thorax is muscular- but this reason is not accurate. Diaphragm is dome shaped and thus it's contraction increases the volume of the thoracic cavity. Thus option 1 is correct.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.