Answer: The true statement is: Autocrine signals are produced by and act upon the same cell
Explanation:
Autocrine signals are made by cells producing hormones or molecules that acts on the same cell that produces it.
Usually, these autocrine hormones bind to receptors positioned in the cells producing them and thereby signal/exert changes in the cell.
Other options contains false statements
- Steroid hormones are produced ONLY when needed, not produced in advance and then stored
- Neurohormones do not help in the transmission of nerve impulses; So, they ARE NOT neurotransmitters
- Paracrine signals exert their effects on nearby cells; thus, they are not for long distance communication.
The ONLY true statement is that 'Autocrine signals are produced by and act upon the same cell.'
