BI110 Chapter Notes - Chapter Module 20: Signal Transduction, Endocrine System, Human Embryogenesis
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A: cancerous tumors grow when macrophages fail to recognize cancer cells as. A: using environmental cues, or signals, and signal receptors, cells interact with each other. A: single-celled organisms such as bacteria may coordinate a group response using bioluminescence or aggregation. Many single-celled eukaryotes, such as yeasts, are surprisingly social organisms that interact with each other to find mating partners. (the mechanisms that cells use to share information are common to many diverse species) A: light or heat, touch or pressure, and most frequently chemical. A: signal transduction (along pathways), which produce cellular responses to extracellular signals. A: cells that respond to a stimulus (chemical signal usually) they secrete ligands. A: signaling molecules that bind directly to receptors, or other binding partners, on target cells to produce biological responses. (specific to their receptors) A: hormones, chemical messengers secreted by glands, and neurotransmitters, (chemicals produced by the nervous system).
