Which of the following is a substance that acts at a long distance from the site at which it is secreted?
A. synaptic signal
B. paracrine signal
C. hormone
D. neurotransmitter
E. local regulator
Answer: C
Which of the following is a substance that acts at a long distance from the site at which it is secreted?
A. synaptic signal
B. paracrine signal
C. hormone
D. neurotransmitter
E. local regulator
Answer: C