BIOL 260 Study Guide - Midterm Guide: Venus Flytrap, Adrenal Medulla, Sympathetic Nervous System
Document Summary
Fundamental features of response systems: external signal -> receiver -> transducer -> amplifier -> response. Diff in mech used to coordinate responses among cells b/w plants and animals. Indiv cells detect signal. (exception: trigger hair system in venus fly trap involves complex organ) Types of signals that can be detected (chemical, mechanical, electromagnetic). Involves multiple cell types. (exception: sense of touch involves single cells) Chemical (endocrine) + electrical (nervous system) signaling important. Short distance: paracrine signaling molecules (chemicals released from a cell that acts on nearby cell). Allows rapid signalling across long distances (bc it uses electrical signals) Signaling among indivs: pheromones (chemical released by one indic that has effect on another of the same species. Direct cell to cell via plasmodesmata or active pumping. Long distance: transport of hormones via phloem and xylem. Inter-indiv signaling in plants. (ex: a plant being eaten releases chemical into environment and other plants sense it.
