Questions: Which statement is true of dendrites? A They transmit information to other neurons and/or cells B They are the main input regions of the neurons C They support the immune system of the nervous system D Most neurons have only one dendrite

The answer is B: They are the main input regions of the neurons.

Explanation for each option:

A. They transmit information to other neurons and/or cells - This statement is incorrect. Axons, not dendrites, are responsible for transmitting information to other neurons and/or cells.

B. They are the main input regions of the neurons - This statement is correct. Dendrites are the structures on neurons that receive electrical messages from other neurons. They are the main input regions where synaptic signals are received.

C. They support the immune system of the nervous system - This statement is incorrect. Dendrites do not have a role in supporting the immune system. Microglia are the primary immune cells in the nervous system.

D. Most neurons have only one dendrite - This statement is incorrect. Most neurons have multiple dendrites to receive signals from various sources.

Summary: Dendrites are the main input regions of neurons, responsible for receiving synaptic signals from other neurons. Therefore, the correct statement is B.