Why is it important that synthesis of globin chains and heme be balanced in the RBCs?
a. Excess concentration of protoporphyrin increases bilirubin in plasma.
b. An excess of one of the components of hemoglobin decreases RBC survival.
c. An excess of one of the components of hemoglobin increases RBC survival leading to an eventual elevated RBC count.
d. An excess of globin chains significantly decreases the concentration of globin chain messenger ribonucleic acid (mRNA) in the developing RBCs.
ANS: B
An excess of one of the components of hemoglobin can decrease RBC survival in circulation. None of the other listed items are true in the presence of an excess.
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Swelling damages brain tissue because:
a. It compresses blood vessels, depriving neurons of oxygen b. It compresses neurons and damages them directly c. It prevents Na+ influx so action potentials cannot be generated d. It prevents neurotransmitter release at synapses
Gingivitis is a disease affecting the soft tissues because the inflammatory infiltrate is confined to the gingival
A) Both statement and reason are correct. B) Both statement and reason are incorrect. C) The statement is correct, but the reason is incorrect. D) The statement is incorrect, but the reason is correct.
The technique used to show detailed images of structures located within a predetermined plane of tissue while eliminating or blurring those structures in the planes not selected is called "tomography."
Indicate whether the statement is true or false
Potential maternal antibody interference is the reason to defer MMR vaccine until one year of age.
a. true b. false