Ion concentration differences produce an action potential creating a signal. The difference between a weak signal and an intense signal is
A. weak stimuli only open sodium gates, strong signal also open potassium gates.
B. the frequency at which an axon fires.
C. the action potential is graduated and a weak signal causes a small change in polarity.
D. a strong signal does not allow repolarization but sends a constant flow of ions.
E. All of the choices are correct.
Answer: B
You might also like to view...
What condition develops when serotonin levels in the brain are deficient?
A. insomnia B. epilepsy C. Alzheimer's disease D. Parkinson's disease E. Huntington's disease
Which of the following does not initiate DNA synthesis?
a. a double-stranded DNA virus (Poxviridae) b. a DNA virus with reverse transcriptase (Hepadnaviridae) c. an RNA virus with reverse transcriptase (Retroviridae) d. a single-stranded RNA virus (Togaviridae) e. none of the above
What are the two key assumptions necessary to establish causality from a regression model?
A. Targeted sample of participants and random assignment of the treatment B. Random sample of participants and random assignment of the treatment C. Random sample of participants and targeted assignment of the treatment D. Targeted sample of participants and targeted assignment of the treatment
If you were designing a new insecticide absorbed via the respiratory system in arthropods, the killing chemical would enter the invertebrate through the
A. epidermis. B. tracheae. C. alveoli. D. bronchioles. E. gills.