Which of the following statements correctly describes the relationship between cell signaling, homeostasis, and physiological coordination systems in multicellular organisms?
In a negative feedback pathway, the sensory receptor acts as the direct effector of the physiological change, allowing the pathway to bypass coordinator systems and speed up homeostatic restoration.
Water-soluble signaling molecules, such as insulin, cross the plasma membrane via active transport to bind to intracellular transcription factors, initiating genomic responses.
Hormonal communication systems achieve coordination by transmitting chemical signals through the circulatory system to elicit widespread and prolonged effector responses, whereas nervous coordination relies on electrical impulses and synaptic neurotransmitters to trigger rapid, highly localized, and transient responses.
Positive feedback loops are the primary homeostatic mechanism used by endotherms to regulate core body temperature and blood glucose levels back to their constant physiological set points.
