In the filtration experiment, which substances passed through the filter paper because of their small molecular size?
A. Water, glucose, and starch
B. Water, starch, and charcoal
C. Water and glucose
D. Water, glucose, starch, and charcoal
E. Starch and charcoal
Answer: C
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A neurotransmitter may be excitatory at one synapse and inhibitory at another
Indicate whether the statement is true or false
Which of the following is a NOT direct function of the Na+-K+ pump?
a. development of a Na+ gradient across the cell membrane b. development of a K+ gradient across the cell membrane c. regulation of cellular pH d. cell volume regulation e. all of these are direct functions of this pump.
Differentiate between divergent and convergent neural circuits
A) In divergent circuits, information spreads from one neuron to several neurons. In convergent circuits, several neurons synapse with one postsynaptic neuron. B) In divergent circuits, several neurons synapse with one postsynaptic neuron. In convergent circuits, information spreads from one neuron to several neurons. C) In divergent circuits, information from one neuron is spread through one hemisphere of the cerebrum. In convergent circuits, information from one neuron is spread through both cerebral hemispheres. D) In divergent circuits, information from one neuron is spread through both cerebral hemispheres. In convergent circuits, information from one neuron is spread through one hemisphere of the cerebrum. E) In divergent circuits, branches of axons somewhere along on the circuit extend back toward the source and stimulate the presynaptic neuron similar to a positive feedback loop. In a convergent circuit, the original presynaptic neuron is not stimulated by axons further down the circuit.
What term describes hormones secreted by the hypothalamus that regulate the secretion of hormones from the anterior pituitary gland?
A. growth factors B. paracrine factors C. hypophysiotropic hormones D. metabotrobic-releasing factors E. cerebrovitalistic hormones