Negative Feedback Mechanism in Homeostasis

len Alfred Ajibola - Thu, 06th February, 2020 @ 14:24

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Academic Questions in Biology

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Which of the following is NOT a part of the wrist bones (or carpal bones)?

  • A. Cuboid
  • B. Scaphoid
  • C. Hamate
  • D. Triquetral
  • E. Pisiform
  • F. Trapezium

The statements below are true concerning arteries except _____.

  • A. The arterial wall has 4 layers

  • B. Tunica Adventitia is the outermost layer of an artery

  • C. Aorta is the largest artery in the human body

  • D. Pulmunary artery conveys deoxygenated blood

  • E. Internal bleeding will occur when a deeply located artery is broken

  • F. Arterial vascular disorders are worsened in people with diabetes and renal failure

The following statements are true concerning blood vessels except _____.

  • A. They are comprised of arteries, veins and capillaries

  • B. Problems associated with blood vessels are called vascular disorders

  • C. All veins carry blood towards the heart

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  • E. Arteries usually divide to form arterioles

  • F. Arterioles give rise to capillaries

Food Pyramid - Len Academy

The above diagram shows a _____.

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Anything that elicits a physiological response from an organism is termed _____.

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  • B. Irritability

  • C. Adaptation

  • D. Competition

  • E. Stimulus

  • F. Action potential

Which of the following molecule is utilized directly as energy in the human body?

  • A. Glucose

  • B. Carbohydrate

  • C. Starch

  • D. Adenosine Mono Phosphate

  • E. Adenosine Di Phosphate 

  • F. Adenosine Tri Phosphate

Which of the following is not a basic characteristics of life?

  • A. Locomotion

  • B. Competition

  • C. Adaptation

  • D. Irritability

  • E. Nutrition

  • F. Death

The final organisms in a food chain are best referred to as _____.

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  • B. Parasites

  • C. Commensals

  • D. Decomposers

  • E. Tertiary consumers

  • F. Quatenary consumers



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Negative Feedback Mechanism:

To explain the concept of negative feedback mechanism in homeostasis, take a moment to imagine yourself walking down the road on a sunny day. Through this action, you are likely to sweat.

From the above scenerio, your act of sweating is good for you because this is how the homeostatic process regulates (attempts to cool) your body from the sun's hot rays.

Note: A good understanding on the concept of Homeostasis will aid you to better comprehend the negative feedback mechanism.

Please read on the Concept of Homeostasis here.

The diagram below shows the process of homeostasis and its eventual negative feedback mechanism on a sunny day.

Negative Feedback Mechanism for Temperature - Len Academy

Understand that sweating helps lower your body temperature and this is a good thing on a sunny day. This is true because when an increased bodily temperature isn't checked, controlled or regulated, it becomes dangerous to the health.

You can read on the Red Blood Cells and Hemoglobin here.

Still using the above instance, you will notice that the amounts of urine produced by your kidneys will become lesser on this sunny day. This is happening because you are already losing water and salt (through sweating), thus less urine is produced in an attempt to make up for your water loss, (that is; an attempt to conserve water).

Again, you are likely to drink a lot of water on this sunny day due to a higher tendency of being thirsty. This thirstiness is brought about by the hypothalamus (through stimulations from the pituitary gland which is also referred to as the master endocrine gland). The goal of being thirsty is to enable you drink more water, thus compensating for the water loss which resulted from sweating.

All of these homeostatic processes in the above paragraphs will continue on and on. If not checked, it might become detrimental to the your health.

Please read on the Cerebrum and Hypothalamus here.

From our above instance (walking down the road on a sunny day), you can't continue to sweat forever because that will not be good for you.

Now, what seems to be a solution at the beginning of our example (sweating) can now potentially cause excessive water loss; and this is where the negative feedback mechanism comes into play. To this end, the kidneys produces less urine while the hypothalamus stimulates thirst in an attempt to compensate for water loss through sweating.

Please read on Sources, Functions and Defficiencies of Mineral Salts in Humans here.

Below is an explanation on the concept of a negative feedback mechanism through an homeostatic process occuring in a cold day:

On a cold day, the body's metabolic rate reduces and as a result, we barely sweat. Also, the body's temperature decreases. To this end, the various homeostatic organs will carry out the following processes (homeostatic functions) in an attempt to increase the body's temperature and metabolic rate, thus ultimately resulting in the elimination of water from the body. These homeostatic processes will include:

  1. Shivering in order to increase the body's metabolic rate and temperature.
  2. More urine is produced by the kidneys in order to eliminate more water on this cold day.
  3. Thirst becomes inhibited by the Hypothalamus in an attempt to prevent further addition of water into the body systems.

Temperature regulation in Homeostasis - Len Academy

The above homeostatic processes is vital for survival on a cold day but the point is: "Such processes must eventually stop; else the individual will die from the continuous loss of water". It is at this point that the negative feedback mechanism comes to the rescue.

  • For the negative feedback to achieve its purpose, all the aforementioned homeostatic processes that led to the loss of water in the above instance must be reversed.

    You can read on the Uniqueness of Man here.

Note: It is important to state that the stimuli that initiated the the homeostatic process will at some point cease to exist. For instance, the individual may put on the house heater in order to reverse the stimuli, (that is, the cold environment).

The Negative Feedback Mechanism is therefore a result of coordinations from the nervous and endocrine systems in an attempt to inhibit, stop or reverse the homeostatic responses to a stimuli.

Please read on the Introduction to the Human Brain here.

Negative feedback mechanism therefore allows the increasing product of a process or pathway to be controlled, decreased or put into check. Generally, it causes a decrease in the function of a homeostatic process.

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Alfred Ajibola is a Medical Biochemist, a passionate Academician with over 7 years of experience, a Versatile Writer, a Web Developer, a Cisco Certified Network Associate and a Cisco CyberOps Associate.

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