Question

Which of the following act as internal stimuli for the generation of response?
(a)Light
(b)Smell
(c)Thyroxine
(d)Sound

Answer 1

Hint The first aspect of a homeostatic control system is always an inner stimulus. A homeostatic imbalance is one form of internal stimulus. The principal hormone secreted by the thyroid gland into the bloodstream is an example of internal stimuli. It plays important roles in digestion, functioning of the heart and muscles, brain growth, and bone maintenance.

Complete answer:
-The stimulus is any change in the internal or external environment of the organism which causes the organism to respond. It is external and internal in two respects.
-The stimulation outside of the body is an external stimulus. For instance, light stimulation, heat stimulation, chemical stimulation, sound stimulation, etc.
-The stimulus that comes from within an organism is the internal stimulus. Humor stimuli and neural stimuli etc (release of hormones such as thyroxine).
-Therefore, thyroxine serves as an internal stimulus to create a response.
-In response to changes in extracellular fluids such as blood or the concentration of ions in the blood, a humoral stimulation refers to hormone release regulation.
-Example: Thyroxine is a hormone that is secreted into the bloodstream by the thyroid gland. Thyroxine passes to the organs while in the bloodstream, such as the liver and kidneys, where it is transformed into its active triiodothyronine type.

So, the correct answer is, ‘Thyroxine’.

Note: The primary driving force for changes in the body is homeostatic imbalances. Receptors and sensors in various parts of the body track these stimuli closely. These sensors are mechanoreceptors, chemoreceptors, and thermoreceptors that respond to pressure or elongation, chemical changes, or changes in temperature, respectively.
Thyroxine regulates how much energy (the metabolic rate) the body uses. Digestion, how the heart and muscles function, brain growth, and bone health are all concerned. Many of the body's functions slow down when the thyroid gland may not produce enough thyroxine (called hypothyroidism).