Predict the expected consequence(s) of applying a toxin that blocks voltage-gated Ca2+ channels in a neuron.
A. No resting membrane potential would be observed (i.e., measures at 0 mV).
B. Neuron conducts action potentials normally, but would not transmit these potentials across chemical synapses.
C. The neuron would become hyperpolarized.
D. A rapid increase in membrane potential at threshold voltage would not occur.
E. Membrane potential would increase rapidly to peak with an action potential, but would not decrease immediately afterward.
Answer: B
You might also like to view...
Answer the following statements true (T) or false (F)
1. All diseases caused by Rickettsia spp. are arthropodborne. 2. Viruses contain both DNA and RNA. 3. The cell walls of archaeans contain a thicker layer of peptidoglycan than bacterial cell walls. 4. On entering a bacterial cell, all bacteriophages immediately initiate the lytic cycle. 5. Mycoplasmas cannot grow on artificial media.
________ reactions release energy when electrons are removed from a substance.
Fill in the blank(s) with the appropriate word(s).
When does pregnancy start?
a. at fertilization b. when a zygote forms c. at gestation d. when the zygote implants in the uterus
Evolution is genetic change in __________ that occurs over time
a. an individual b. a population c. a community d. an ecosystem e. the biosphere