Antigen displaying cells are infected by pathogens so they can display the antigens
Indicate whether the statement is true or false.
FALSE
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Shortly after implantation ________
A) the trophoblast forms two distinct layers B) the embryo gastrulates (within 3 days) C) myometrial cells cover and seal off the blastocyst D) maternal blood sinuses bathe the inner cell mass
Bacteria-destroying stellate macrophages are found in the sinusoids of which of the following?
A. The liver B. The gastric glands C. The pancreas D. The intestinal crypts E. The appendix
Explain the relationship among BPG, oxygen, and hemoglobin
A) BPG is a compound generated by RBCs that decreases hemoglobin's affinity for oxygen. If the concentration of BPG increases, the amount of oxygen released by hemoglobin will increase. B) BPG is a compound generated by RBCs that decreases hemoglobin's affinity for oxygen. If the concentration of BPG increases, the amount of oxygen released by hemoglobin will decrease. C) BPG is a compound generated by RBCs that increases hemoglobin's affinity for oxygen. If the concentration of BPG increases, the amount of oxygen released by hemoglobin will increase. D) BPG is a compound generated by RBCs that increases hemoglobin's affinity for oxygen. If the concentration of BPG increases, the amount of oxygen released by hemoglobin will decrease.
Which statement is correct concerning the terms afferent and efferent with respect to the nervous system?
A. Both terms refer to conducting impulses toward the CNS although afferent pathways carry only motor impulses. B. Afferent refers to the conduction of sensory impulses toward the CNS. C. Afferent refers to the conduction of an impulse outward from the CNS. D. Both terms refer to conducting impulses outward from the CNS although efferent pathways carry only sensory impulses. E. Efferent refers to the conduction of motor impulses toward the CNS.