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External Stimuli

7.13A External Stimuli

EXTERNAL STIMULUS A change in the environment outside of the organs.
FEEDBACK MECHANISM A response within a system that influences the activity of that system.
FORCE A push or pull that can change the position or most of an object.
GEOTROPISM Growth that happens in organisms in response to gravity, such as the downward growth of plant roots.
HOMEOSTASIS The body ability to keep the internal balance.
MOTION A change in position over time.
PHLOEM The vascular tissue in plants that conducts sugars and other metabolic products downward from the leaves.
PHOTOTROPISM Growth of a plant shoot toward or away from light.
ROOT SYSTEM All of a plant's roots, which anchor it in the soil, absorb and transport minerals and water, and store food.
SHOOT SYSTEM The aerial portion of a plant body, consisting of stems, leaves, and (in angiosperms) flowers.
STABLE Balanced; unchanging.
STIMULUS A thing or event that evokes a specific functional reaction in an organ or tissue.
TRANSPIRATION The process by which water is lost through a plant's leaves.
TROPISM The turning of all or part of an organism in a particular direction in response to an external stimulus.
TURGOR PRESSURE The pressure that is exerted on the inside of cell walls and that is caused by the movement of water into the cell.
XYLEM Vascular tissue that carries water upward from the roots to every part of a plant.
Created by: trauberk
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