Fight-or-flight response, response to an acute threat to survival that is marked by physical changes, including nervous and endocrine changes, that prepare a human or an animal to react or to retreat. Other examples of external stimuli include television and commercial ads, a window display at a clothing store, or a recommendation of a product. Explanation: The process by which organisms react to stimuli that keep the conditions in their body suitable for life is called homeostasis. Create your account. All rights reserved. For example, light is an external stimulus. Stimuli are environmental changes that an organism can detect. A body's response to ingesting medicine is one example of external stimuli. Define the term stimulus as used in Biology. The reactions to stimuli are known as responses. : The approval of others is a potent stimulus. The result of response to stimuli coming from outside the plant. Internal Environment and Homeostasis The body is surrounded by the external environment that provides nutrients and oxygen that are necessary for life. The non-directional movements of the plant in response to external stimuli are called nastic movement. The response is typically movement of some sort. This is important to: Avoid predation. Choose from 500 different sets of stimuli biology flashcards on Quizlet. What is a Stimulus. An external stimulus is a stimulus that originates from outside the organism. Conditioned stimulus and The ability of an organism or organ to detect external stimuli, so that an appropriate reaction can be made, is called sensitivity. Sense organs, such as the ear, and sensory receptors, such as those in the skin, are sensitive to external stimuli such as sound and touch. The sense organs, including the eye, contain receptors that are sensitive to stimuli and respond with reflex actions. 2 people chose this as the best definition of stimulus: (psychology) Anything eff... See the dictionary meaning, pronunciation, and sentence examples. Sensory receptors can receive information from outside the body, as in touch receptors found in the skin or light receptors in the eye, as well as from … The external environment also receives waste materials from the body. Depending upon the nature of the stimuli, induced movements may … For example, when a person is hungry and sees a slice of pizza, internal stimuli from within the body, such as a stomach growl, salivating and hunger pain, indicates the need for food; the external factor, the pizza slice that a person is viewing through sight, serves as the external stimuli. Obtain more light, water and minerals. Negative thoughts and self-talk that affect performance are examples of internal stimuli. Avoid abiotic (non-living) stress. Internal stimuli, such as blood pressure rates, occur due to receptors in the body that cause blood vessels to open or constrict. (2) (physiology) That which influences or causes a temporary increase of physiological activity or response in the whole organism or in any of its parts. For example, psychology is going to look at how humans and the human brain respond to certain stimuli, while biology might look at how stimuli affect other organisms. Stimuli are generally easy to understand if you keep in mind that Internal means Feelings, External means Reaction. An external stimulus is a stimulus that originates from outside the organism. answer! Behaviour is the set of responses that an organism makes to stimuli. If someone shines a bright light in your eye you close your eyes. Fact Check: What Power Does the President Really Have Over State Governors? Such effects on cellular and physiological phenotypic traits may result from external or environmental factors, or be part of normal development. For example, when playing a sport, factors such as rain or snow can impede an athlete's physical abilities. It depends on your definition of 'instantaneous' and on your definition of 'stimulus'. Is the Coronavirus Crisis Increasing America's Drug Overdoses? External Stimuli are reactions to the world around you, for instance someone throws something at you, you flinch. When these cells are damaged in some way, motor neuron disease can arise. Psychology Definition of STIMULUS: Any external or internal situation, event or agent that arise a response from animal or human. Life is defined as any system capable of performing functions such as eating, metabolizing, excreting, breathing, moving, growing, reproducing, and responding to external stimuli. Most leaves are covered in these tiny pores, which allow the plants to take in carbon dioxide for use in photosynthesis and expel their waste oxygen.. Biology Stack Exchange is a question and answer site for biology researchers, academics, and students. Stimulus can be of many types. Plant Responses explain why plants need to respond to their environment in terms of the need to avoid predation and abiotic stress Like animals, plants must also need to respond to external stimuli. External stimuli affect one from the outside - anything that touches upon one of the five senses. Something causing or regarded as causing a response. Reflexes are always triggered by external stimuli and are usually simple behaviors.. Find more ways to say stimuli, along with related words, antonyms and example phrases at, the world's most trusted free thesaurus. The variation in the intensity of some external- factor acts as stimulus. Earn Transferable Credit & Get your Degree, Get access to this video and our entire Q&A library. External-stimulus definitions A signal (stimulus) that originates from outside an organism. They are the organisms … Will 5G Impact Our Cell Phone Plans (or Our Health?! All living things tend to respond to various types of stimuli. The body has an internal environment which is maintained more or less constant by certain biological mechanisms. In plants, a stoma is a tiny pore in the surface of a leaf that is used for gas exchange. The functions of this response were first described in the early 1900s. Ensure germination in suitable […] Learn stimuli biology with free interactive flashcards. Part 15 of 15 - Question 35 of 40 5.0 Points Match the term with the correct definition on external stimuli response. Maximise photosynthesis. I can safely say that secondary neurons can fire multiple action potentials to a single, short physical stimulus delivered to the associated sensory neuron. The direction of the movement is determined by the structure of the plant organ itself. External stimuli can affect a person's decision-making abilities and choices. Services, Internal & External Stimuli: Definition & Examples, Working Scholars® Bringing Tuition-Free College to the Community. See more. Definition noun, plural: stimuli (1) (physiology) A detectable change in the internal or external environment. In biology, most biochemical processes strive to maintain equilibrium (homeostasis), a steady state that exists more as an ideal and less as an achievable condition. stimulus [stim´u-lus] (L.) any agent, act, or influence that produces functional or trophic reaction in a receptor or an irritable tissue. A motor neuron is a cell of the central nervous system.Motor neurons transmit signals to muscle cells or glands to control their functional output. For example, light is an external stimulus. © copyright 2003-2020 So this should mean that bacteria and potatoes are indeed conscious as they can react to external stimuli. In plant biology, any type of 'tropism' is a plant's physical response to some sort of external stimuli. 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Definition. It originates from outside... Our experts can answer your tough homework and study questions.