Direct-acting neurotransmitters ________.
A) require cyclic AMP
B) mediate very slow responses
C) open ion channels to provoke rapid responses
D) act through second messengers
Answer: C) open ion channels to provoke rapid responses
Direct-acting neurotransmitters ________.
A) require cyclic AMP
B) mediate very slow responses
C) open ion channels to provoke rapid responses
D) act through second messengers
Answer: C) open ion channels to provoke rapid responses