The primary means of cellular communication in the body is through hormones and neurotransmitters. Hormones, produced by endocrine glands, travel through the bloodstream to target organs, influencing numerous physiological processes like growth, metabolism, and mood regulation. On the other hand, neurotransmitters are released by neurons and communicate signals across synapses, facilitating rapid responses among nerve cells. This intricate communication network allows for coordination and integration of bodily functions, demonstrating the complexity of physiological systems and the importance of signaling pathways in homeostasis.