Which of the following act as pain-signaling molecules?
a. substance P
b. morphine
c. endorphins
d. histamine and prostaglandins
e. dopamine
d
You might also like to view...
The model that assumes that evolution proceeds with slow successive change in a given evolutionary line is referred to as
A. successive descent model. B. punctuated equilibrium. C. gradualism. D. the allopatric model. E. the sympatric model.
Grassland expansion is associated with which of the following variables?
A. increased rainfall and decreased atmospheric CO2 B. increased rainfall and increased atmospheric CO2 C. decreased rainfall and decreased atmospheric CO2 D. decreased rainfall and increased atmospheric CO2 E. increased CO2 and increased sunlight availability
The first day of the menstrual cycle is marked by ____
a. the beginning of ovulation b. the onset of PMS c. the beginning of menstruation d. an increase in the thickness of the uterine lining e. the beginning of the luteal phase
Most of the genes controlling development encode either signal molecules or ________
Fill in the blank(s) with correct word