Which of the following would produce 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.
The function of neurotrophins is to:
a. inhibit proliferation.
b. promote survival of axons.
c. be used as fuel.
d. signal that an axon has been “rejected.”
If a characteristic is controlled by an X-linked recessive gene, it produces its apparent
effects:
a. more often in males.
b. more often in females.