Which process indicates spatial summation?
a. Present two or more weak stimuli at the same time.
b. Start action potentials at both ends of one axon at the same time.
c. Do not allow a flexor muscle to relax before stimulating it again.
d. Present a rapid sequence of weak stimuli.
Question 2
In the control of appetite, CCK, leptin, and insulin converge their effects onto hypothalamic cells that release transmitters in the ____ family.
a. melanocortin
b. endorphin
c. acetylcholine
d. purine