QUESTION 5 What is the function of major histocompatibility class (MHC) I molecules? o assist with strengthening the cell membrane. o identify which cells are 'self' cells. o allow movement of materials across the cell membrane. o provide signals to neighboring cells to promote cell division.
QUESTION 5 What is the function of major histocompatibility class (MHC) I molecules? o assist with strengthening the cell membrane. o identify which cells are 'self' cells. o allow movement of materials across the cell membrane. o provide signals to neighboring cells to promote cell division.
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:QUESTION 5
What is the function of major histocompatibility class (MHC) I molecules?
o assist with strengthening the cell membrane.
o identify which cells are 'self' cells.
o allow movement of materials across the cell membrane.
o provide signals to neighboring cells to promote cell division.
Transcribed Image Text:QUESTION 3
Which of these represents a chemical barrier against pathogens?
o Mucus secretions trap and rinse pathogens out of the body.
Urination carries pathogens out of the urinary tract.
o Low pH conditions in the stomach kill some pathogens and prevent other pathogens from growing.
o Cilia in the nasal passages and respiratory tract push mucus containing trapped pathogens out of the body.
QUESTION 4
What is the difference between natural killer cells and macrophages?
Natural killer cells are not always present in the body and must be induced, whereas macrophages are constantly present.
o Natural killer cells actually kill foreign cells, whereas macrophages serve only a signaling function.
Only macrophages can invade host tissues to fight foreign cells that make their way into those tissues.
Natural killer cells kill foreign cells through the processes of apoptosis and proteolysis, whereas macrophages kill foreign cells by
o phagocytosis.
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