Physiology V01 - Introduction to Human Physiology » Fall 2021 » Lecture Quiz 10

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Question #1
The acidity of the secretions of the skin, stomach, urine and vagina help to kill pathogens.
A.   TRUE
B.   FALSE
Question #2
Which of the following results when the complement system is activated by the binding of antibodies to an antigen?
A.   formation of membrane attack complexes
B.   enhancement of phagocytosis of pathogens (opsinization)
C.   attraction of neutrophils and macrophages (chemotaxis)
D.   all the above
E.   enhancement of the inflammatory response by mast cells
Question #3
MHC II receptors are found on all nucleated cells.
A.   FALSE
B.   TRUE
Question #4
Which step of T cell dependent humoral immunity is not correct?
A.   a helper T (CD4) cell, whose T cell receptor matches the antigen attaches, and is activated
B.   plasma cells secrete antibodies against the antigen
C.   activated CD4 cell then attaches to the MHC II receptor/antigen complex of a B cell and releases cytokines (IL-2)
D.   cytokines stimulate the B cell to produce plasma and memory cells
E.   antigen is processed by an antigen presenting cell (APC) and attaches antigen fragment to its’ MHC I receptor
Question #5
IgE antibodies are surface antigen receptors on B cells.
A.   TRUE
B.   FALSE
Question #6
Which of the following steps of inspiration is incorrect?
A.   diaphragm contracts increasing the length of the thoracic cavity
B.   intercostal muscles contract moving the ribs up and out → increases the width and depth of the thoracic cavity
C.   increase in the size of the thoracic cavity → increase in its volume → decrease in the intrathoracic pressure
D.   volume of lungs increases
E.   ↑ volume of lungs → ↑ intrapulmonary pressure
Question #7
Reduced (↓) alveolar ventilation leads to decreased (↓) PO2 in blood which causes dilation of the pulmonary arterioles serving these alveoli.
A.   TRUE
B.   FALSE
Question #8
The saturation of hemoglobin is directly proportional to which of the following?
A.   2,3-DPG concentration and pH
B.   temperature and pH
C.   temperature and surfactant
D.   pO2 and pH
Question #9
What type of cells produce surfactant?
A.   alveolar type I
B.   dust cells
C.   alveolar type II
D.   squamous cells
E.   macrophages
Question #10
Most of the carbon dioxide in the blood is dissolved in the blood plasma.
A.   FALSE
B.   TRUE
Question #11
Which step of cytotoxic (CD8) T cell activation is not correct?
A.   memory CD8 cells are produced
B.   activated CD8 cells are produced
C.   it is then costimulated by IL-2 from helper T cells
D.   CD8 cells divide
E.   the receptor of an inactive CD8 cell attaches to a specific antigen on the MHC I receptor of an antigen-presenting cell (APC)
Question #12
When there is a increase in PCO2 → ↑ H+ → ↑ chemoreceptors in medulla and the carotid and aortic bodies → ↑ inspiratory center.
A.   FALSE
B.   TRUE

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