Which of the following is an external stimuli?(1 point)
1.gravity
2.sensory information
3.gravity
4.water in a cell
5.homeostasis
5/5 guys 100%
A) Hunger
B) Dreams
C) Thoughts
D) Pain from an injury
Answer: D) Pain from an injury
To determine which of the given options is an external stimulus, we first need to understand what external stimuli are.
External stimuli refer to any physical or environmental factors that can affect an organism's senses and elicit a response. These stimuli are typically outside of the organism's control and come from the surrounding environment.
Now, let's examine the given options to identify the one that fits this definition:
1. Sight: Sight is a sensory perception that occurs when light enters the eyes and stimulates the photoreceptor cells. However, sight itself is not an external stimulus but rather the result of external stimuli such as light.
2. Hunger: Hunger is an internal state and not considered an external stimulus. It arises from physiological needs within an organism and does not originate from the environment.
3. Temperature: Temperature is indeed an external stimulus. It refers to the intensity of heat or cold in the environment that can be sensed by organisms through their thermal receptors. Different temperatures can elicit various responses in organisms, such as seeking shelter or adjusting metabolic rates.
4. Thoughts: Thoughts, or mental processes, are subjective experiences and not tangible, physical stimuli. They arise from internal cognitive activity and are not considered external stimuli.
Based on the explanations, the correct option from the given choices that represents an external stimulus is "Temperature." It is the only option that fits the definition of an external stimulus as a physical or environmental factor capable of affecting an organism's senses.