Which type of lever is demonstrated by using scissors?
A) a first-class lever
B) a second-class lever
C) a fourth-class lever
D) a third-class lever
A
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A postsynaptic neuron will have an excitatory postsynaptic potential (EPSP) when
A) chemically regulated potassium channels are open and potassium is diffusing out of the cell. B) more calcium ions than usual diffuse into the neuron. C) chemically regulated sodium channels are open and sodium is diffusing into the cell. D) the neuron is hyperpolarized. E) more potassium ions than usual diffuse out of the neuron.
At the optic chiasm, the fibers in the lateral half of each optic nerve cross over
Indicate whether the statement is true or false
Two receptors, A and B, can bind the same chemical signaling molecules but the concentration of those molecules required to reach 50% saturation is twice as great for receptor B. Therefore, the receptors have the same ________, but different ________
A. specificity, affinity B. specificity, saturation C. affinity, specificity D. affinity, competition E. competition, affinity
If the radius of the airway increases, what will happen to the airflow resistance?
A. Resistance decreases. B. Resistance increases. C. Resistance first decreases, then increases. D. There is no change in resistance