This figure shows an anterior view of the right orbit. What feature does number 4 indicate?
A. Common tendinous ring
B. Central tendinous ring
C. Optic canal
D. Optic nerve
E. Trochlea
Answer: C
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Draw graphs showing the effect on action potentials in a cell following effective doses of each of the listed neurotoxins. Assume that the cell is normally brought to threshold by an electrical stimulus applied to it, so that any abnormality is due to the toxin. Precise values for voltage and duration are not important, just a general trend in how the action potential may be different from normal.
1. puffer fish poison (blocks voltage -gated sodium channel activation) 2. tetraethylammonium (blocks voltage -gated potassium channels) 3. ouabain (blocks sodium-potassium pumps) 4. sea anemone toxin (blocks voltage -gated sodium channel inactivation)
Vasodilation of the blood vessels supplying a tissue increases the flow of blood to that area
Indicate whether the statement is true or false
The collecting ducts and distal convoluted tubules
A. reabsorb glucose. B. collect filtrate from Bowman's capsule. C. actively transport sodium ions but not chloride ions. D. vary in their permeability to water relative to the amounts of ADH present. E. do not alter their permeability to water.
This figure compares the organization of the somatic motor system and the autonomic nervous system. Identify structure "A" on the above diagram.
A. Autonomic ganglion B. Postganglionic neuron C. Somatic motor neuron D. Effector organ (smooth muscle of GI tract) E. Preganglionic neuron