Explain why transplanted organs are often rejected by their hosts. What will be an ideal response?
Concepts to Consider: Every individual can recognize its own cells and identify any cell
from someone else as foreign, since the cell surface proteins (major histocompatibility
complex antigens) are unique from person to person. When a host's immune system
determines the transplanted organ has different MHC antigens, it regards it as foreign and
launches an immune response. T cells attack the transplanted tissue and destroy it.
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The maximum useful magnification for a light microscope is about
(a) 100X. (b) 1000X. (c) 10,000X. (d) 100,000X.
What occurs during the absorptive period? Check all that apply.
_____ Glucose absorption from the gut is high. _____ Glucose utilization by cells is high. _____ Fat utilization by cells is high. _____ Synthesis of triglycerides is high. _____ Breakdown of glycogen is low.
After burning your hand on a hot burner, which neurotransmitter will most likely be released from the pain receptors?
a. glutamate b. dopamine
c. substance P d. GABA e. acetylcholine
Leukemia refers to several types of blood cancer in which there is an abnormally high number of abnormal or immature white blood cells in the blood.
a. true b. false