Human A&P Question 1 - 5 Question 1 of 5 Which of the following is TRUE of B cel
ID: 177197 • Letter: H
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Human A&P Question 1 - 5 Question 1 of 5 Which of the following is TRUE of B cells? A Activated B cells undergo clonal selection to produce plasma cells and memory B cells B. secrete antibodies. C. B cells do not have antigen receptors on their plasma membrane D. The main function of B cells is to secrete interleukin-2 E, a and b Question 2 of 5 What do Memory B cells, Memory CD8 T cells, and Memory CD4 T cells have in common? A They are long-ived and persist in the body long after a primary immune response is over B. They attack and kil microbial invaders during the primary immune response. C. They are produced and mature inside red bone marrow. D. a and b E. a, b, and c Question 3 of 5 Which of the following most accurately describes the difference between a primary immune response and a secondary immune response? Aprimary response involves antibody-mediated immunity; a secondary response involves cell-mediated immunity B. Aprimary response involves cell-mediated immunity; a secondary response involves antibody-mediated immunity A primary response occurs when an exogenous antigen has been detected a secondary response occurs when an endogenous antigen has been detected. D A primary response occurs when a particular antigen is first detected; a secondary response occurs when that same antigen is detected again, weeks or years later A primary response eliminates microbial invaders prior to the onset of any (e.g., fever, nausea), a secondary response eliminates microbial invaders after symptoms have appeared. Question 4 of 5 Which of the following best describes a water-soluble hormone? A. It is manufactured by a neurosecretory cell In the blood, most molecules of the hormone are bound to transport proteins. When it leaves the blood, the b binds to receptors located either in the or in the nucleus of a target cell The hormone travels in the blood in the "free" form and binds to receptors located on the extracellular surface of the plasma membrane of a target cell In the blood, most molecules of the hormone are bound to transport proteins. When it leaves the blood, it binds to receptors located on the extracelular surface of the plasma membrane of a target cell. Question 5 of 5 which of the following is true of a paracrine substance? A substance diffuses into the blood, travel to a distant tissue, diffuses out of the blood, and bind to receptors on target cells A Once a paracrine substance diffuses through interstitial fluid and binds to receptors on a neighboring cell substance diffuses through interstitial fluid and binds to receptors on the same secreted, a paracrine cell that secreted the substance to begin with a relatively short distance, diffuses out of the blood, and A paracrine substance diffuses into the blood, travels receptors located on cells of a nearby tissue. binds to E. None of these statements are true.Explanation / Answer
1.Naive B-cells get selectively induced by the antigen upon its primary encounter
They undergo clonal selection and differentiated into plasma cells and memory cells.
Effector B-cells during primary response and memory B cells during secondary response produce antibodies for the particular infectious agent which differ in their magnitude.
2.Memory cells persist in the body for the longer time and respond to the infectious agent rapidly during the second time of its encounter.
B-cell development begins in the fetal liver and remaining phases of development occur in the bone marrow.
Mature B-cell express µ and L chains on its membrane and IgD, which circulate in the peripheral blood. They get activated by the antigen and differentiated into plasma cells and memory cells.
3.Primary immune response occurs when the antigen is detected the first time, the secondary immune response occurs when the same antigen encounters the second time.
Both T-cells and B-cells participates in primary and secondary immune response.
4.The plasma membrane hydrophilic outside and lipophilic inside. The water soluble hormone cannot cross the hydrophobic region of the membrane. They bind to cell surface receptor outside the membrane and induces the signalling cascade.
Answer: C
5. A paracrine hormone secreted to the interstitial fluid and binds and binds on the receptor of the neighbouring cell.
Answer: B
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