Cell regulation can be thought of as the effector side of cell communication. Most commonly cell regulation occurs by means of extracellular chemical messengers. Which of the following statement(s) is/are true concerning these messengers?
A. Paracrine regulation involves a messenger which is produced and acts systemically
B. The extracellular signal or stimulus is received by a receptor on or in the target cell
C. Neurocrine regulation depends on a physical connection between the neuron and the target cell
D. Most hormones, local mediators, and neurotransmitters readily cross the cell plasma membrane
Answer:B
Cell regulation can be thought of as the effector side of cell communication. Most commonly cell regulation occurs by means of extracellular chemical messengers. Which of the following statement(s) is/are true concerning these messengers?
A. Paracrine regulation involves a messenger which is produced and acts systemically B. The extracellular signal or stimulus is received by a receptor on or in the target cell C. Neurocrine regulation depends on a physical connection between the neuron and the target cell D. Most hormones, local mediators, and neurotransmitters readily cross the cell plasma membrane