List and briefly describe the four general properties of adaptive immunity
(1 ) Specificity: The immune response is triggered by a specific antigen and defends against only that antigen. (2 ) Versatility: The immune system can differentiate among hundreds of millions of antigens that it might encounter during a normal lifetime. (3 ) Memory: The immune response following the second exposure to a particular antigen is stronger and lasts longer than before. (4 ) Tolerance: Some antigens, such as those on your own cells, do not elicit an immune response.
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Prevention of water loss is a necessary function for life that would best fit in the category of ________
A) metabolism B) responsiveness C) maintaining boundaries D) excretion
The refractory period:
1.prevents the retrograde propagation of Action Potentials along the neuronal membrane 2.prevents the retrograde propagation of Graded Potentials along the neuronal membrane 3.results from actions of the Na+/K+ pump 4.Both 1 and 3 are correct. 5.All of these are correct.
Which of these parts of the embryonic brain is correctly matched with the structure it becomes in the adult brain?
A) mesencephalon-midbrain B) metencephalon-medulla oblongata C) myelencephalon-cerebrum D) telencephalon-pons and cerebellum
Which of the following is the primary factor in the maintenance of a cell's negative charge during resting membrane potential?
A) sodium-potassium pump B) voltage-gated channels C) ligand-gated channels D) leak channels