If someone who is severely allergic to bee stings gets stung, the person may experience anaphylactic shock, which can cause a fatal drop in blood pressure. The drop in blood pressure is due to an inappropriate release of histamine in response to the
sting. Histamine causes massive vasodilation, so how does this affect blood pressure?
What will be an ideal response?
Histamine causes systemic vasodilation, resulting in an increased blood flow through capillaries. Such an increase in blood flow also causes an increase in the amount of fluid that leaks out of the capillaries. So much fluid could be lost from the bloodstream that blood volume would drop, causing a potentially fatal drop in blood pressure.
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Each of the following is an ahermatypic coral except:
a. gorgonians. b. black corals. c. plate corals. d. soft corals.
Multicellular eukaryotes arose about:a
3.8 billion years ago. b. 2 billion years ago. c. 1.3 billion years ago. d. 600 million years ago. e. 250 million years ago.
Which events below are thought to allow p53 to direct a cell into apoptosis?
a) binding of p53 to proteins that directly trigger mitochondrial membrane permeabilization and release of apoptotic factors b) activation of the expression of the BAX gene c) all of the choices are correct d) binding of p53 to several members of the Bcl-2 family proteins
When RNA-dependent RNA polymerase is synthesizing mRNA it is functioning as a ________.
A. helicase B. replicase C. transcriptase D. ligase