EBK ANATOMY & PHYSIOLOGY
5th Edition
ISBN: 9780321888013
Author: Hoehn
Publisher: VST
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Chapter 20, Problem 11CYU
Summary Introduction
To review:
The three different antigen-presenting cells (APCs). The APC most important for T lymphocyte activation.
Introduction:
The APCs are the cells that can engulf antigens. These cells then present fragments of the antigens on the surface. This helps the T cells to recognize them. The T cells are activated by the antigens presented by the APCs.
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A sample of blood was taken from the above individual and prepared for haemoglobin analysis. However, when water was added the cells did not lyse and looked normal in size and shape. The technician suspected that they had may have made an error in the protocol – what is the most likely explanation?
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A sample of blood was taken from the above individual and prepared for haemoglobin analysis. However, when water was added the cells did not lyse and looked normal in size and shape. The technician suspected that they had may have made an error in the protocol – what is the most likely explanation?
The cell membranes are more resistant than normal.
An isotonic solution had been added instead of water.
A solution of 0.1 M NaCl had been added instead of water.
Not enough water had been added to the red blood cell pellet.
The man had sickle-cell anaemia.
With reference to their absorption spectra of the oxy haemoglobin intact line) and deoxyhemoglobin (broken line) shown in Figure 2 below, how would you best explain the reason why there are differences in the major peaks of the spectra? Figure 2. SPECTRA OF OXYGENATED AND DEOXYGENATED HAEMOGLOBIN OBTAINED WITH THE RECORDING SPECTROPHOTOMETER 1.4 Abs < 0.8 06 0.4 400 420 440 460 480 500 520 540 560 580 600 nm 1. The difference in the spectra is due to a pH change in the deoxy-haemoglobin due to uptake of CO2- 2. There is more oxygen-carrying plasma in the oxy-haemoglobin sample. 3. The change in Mr due to oxygen binding causes the oxy haemoglobin to have a higher absorbance peak. 4. Oxy-haemoglobin is contaminated by carbaminohemoglobin, and therefore has a higher absorbance peak 5. Oxy-haemoglobin absorbs more light of blue wavelengths and less of red wavelengths than deoxy-haemoglobin
Chapter 20 Solutions
EBK ANATOMY & PHYSIOLOGY
Ch. 20 - What distinguishes the innate defense system from...Ch. 20 - What is the first line of defense against disease?Ch. 20 - What is opsonization and how does it help...Ch. 20 - Under what circumstances might NK cells kill our...Ch. 20 - What are the cardinal signs of inflammation and...Ch. 20 - Name three key characteristics of adaptive...Ch. 20 - What is the difference between a complete antigen...Ch. 20 - What marks a cell as self as opposed to nonselfCh. 20 - What event (or observation) signals that a B or T...Ch. 20 - Which of the following T cells would survive...
Ch. 20 - Prob. 11CYUCh. 20 - In clonal selection, who does the selecting? What...Ch. 20 - Why is the secondary response to an antigen so...Ch. 20 - Prob. 14CYUCh. 20 - Which class of antibody is most abundant in blood?...Ch. 20 - List four ways in which antibodies can bring about...Ch. 20 - Class II MHC proteins display what kind of...Ch. 20 - Prob. 18CYUCh. 20 - Which type of T cell is the most important in both...Ch. 20 - Describe the killing mechanism of cytotoxic T...Ch. 20 - Prob. 21CYUCh. 20 - Prob. 22CYUCh. 20 - Prob. 23CYUCh. 20 - All of the following are considered innate body...Ch. 20 - The process by which neutrophils squeeze through...Ch. 20 - Antibodies released by plasma cells are involved...Ch. 20 - Which of the following antibodies can fix...Ch. 20 - Which antibody class is abundant in body...Ch. 20 - Small molecules that must combine with large...Ch. 20 - Lymphocytes that develop immunocompetence in the...Ch. 20 - Cells that can directly attack target cells...Ch. 20 - Prob. 9RQCh. 20 - The cell type most often invaded by HIV is a(n)...Ch. 20 - Complement fixation promotes all of the following...Ch. 20 - Using the letters from column B, match the cell...Ch. 20 - Besides acting as mechanical barriers, the skin...Ch. 20 - Explain why attempts at phagocytosis are not...Ch. 20 - What is complement? How does it cause bacterial...Ch. 20 - Interferons are referred to as antiviral proteins....Ch. 20 - Differentiate between humoral and cellular...Ch. 20 - Although the adaptive immune system has two arms,...Ch. 20 - Define immunocompetence and self-tolerance. How is...Ch. 20 - Differentiate between a primary and a secondary...Ch. 20 - Prob. 21RQCh. 20 - What is the role of the variable regions of an...Ch. 20 - Name the five antibody classes and describe where...Ch. 20 - How do antibodies help defend the body?Ch. 20 - Do vaccines produce active or passive humoral...Ch. 20 - Prob. 26RQCh. 20 - Describe the specific roles of helper, regulatory,...Ch. 20 - Prob. 28RQCh. 20 - Prob. 29RQCh. 20 - What events can result in autoimmune disease?Ch. 20 - Prob. 1CCSCh. 20 - Prob. 2CCSCh. 20 - Prob. 3CCSCh. 20 - Prob. 4CCSCh. 20 - Prob. 5CCS
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