What is the antigen challenge, and where does it usually take place?
What will be an ideal response?
The antigen challenge is the first encounter between an immunocompetent lymphocyte and an invading antigen. It usually takes place in the spleen or a lymph node, but may happen in any lymphoid tissue.
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In a state of negative balance, the quantity of a substance in the plasma tends to increase.
a. true b. false
The exchange of oxygen and carbon dioxide between air in the alveoli and blood in the pulmonary capillaries is called _____.?
A) ?external respiration B) ?internal respiration C) ?cellular respiration D) ?oxidation
The parasympathetic division of the ANS has fibers that leave the brain stem by way of cranial nerves. Which of the following is not one of those nerves?
A) facial nerve B) hypoglossal nerve C) vagus nerve D) oculomotor nerve
The foramen ovale of the fetal heart is an opening in the
A. interventricular septum. B. aorticopulmonary septum. C. interatrial septum. D. fossa ovalis. E. tetralogy of Fallot.