Depolarization of an axon is a positive feedback mechanism because ________.
A. as more sodium channels open, the membrane potential decreases
B. as more sodium diffuses into the axon, the more voltage-gated sodium channels open
C. as more potassium channels open, the membrane potential decreases
D. as more sodium diffuses into the axon, the more voltage-gated potassium channels open
Answer: D
You might also like to view...
How do substances move across capillaries?
A) Diffusion B) Through pores C) Transcytosis D) All of the above
Hypercalcemia causes muscle tetany
Indicate whether the statement is true or false
The clavicles articulate with the sternum at the ________ notches.
A. jugular B. first costal C. clavicular D. suprasternal E. mastosternal
Birth control pills act as contraceptives by
a. preventing development of the endometrium into a suitable site for implantation b. preventing ovulation by inhibiting GnRH and thus FSH and LH secretion c. killing sperm d. precipitating in the cervical canal to act as a barrier to sperm entry e. increasing muscular contractions in the female reproductive tract so that ovulated eggs are flushed out before they have a chance to be fertilized