The flow of blood through the heart is controlled by ________
A) valves
B) the SA node
C) the bundle of His
D) the ventricles
A
Explanation: A) Correct!
B) The SA node does not control blood flow.
C) The bundle of His does not control blood flow.
D) The ventricles do not control blood flow.
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The abbreviation VRSA stands for ________-resistant Staphylococcus aureus
Indicate whether the statement is true or false.
Wiskott–Aldrich syndrome involves an impairment of _____
a. lymphocytes and platelets b. classical complement and blood-clotting pathways c. the expression of MHC class I and class II molecules d. T-cell and B-cell development e. cytokine and cytokine receptor production.
Sunscreens that dilute the least with use are called _____ sunscreens
a. "continuous protection" b. "sweatproof" c. "waterproof" d. "water resistant"
The difference between T cell activation by normal antigens and T cell activation by superantigens is that superantigens
cause nonspecific activation of many T cells at once, including those that would not normally recognize the antigen and suppress cytokine release. are not processed and presented by APCs and cause nonspecific activation of many T cells at once, including those that would not normally recognize the antigen. are not processed and presented by APCs. cause nonspecific activation of many T cells at once, including those that would not normally recognize the antigen. suppress cytokine release.