Biology

Negative Feedback Mechanism in Homeostasis

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

Topics in Biology

Ecological pyramid explained with its importance and limitations Hindbrain: Medulla Oblongata and its features Food web explained with examples Biology Scheme of Work, SS1, First Term Biology Scheme of Work, SS1, 2nd Term Biology Scheme of Work, SS1, 3rd Term Seminal Vesicles and Bulbourethral Glands as Male Accessory Sex Organs Scrotum and its contents: Testicles Brain: Introduction to the Human Brain Forebrain: Lobes of the Cerebrum and their Functions Cerebellum: Parts and Functions of the Cerebellum Midbrain: Division and Functions of the Midbrain Negative Feedback Mechanism in Homeostasis Arterial Disorders: Characteristics and Causes of Arterial Disorders Types of Desert and their Characteristics Characteristics of Tropical Rainforest Swamp Forest: What are Swamp Forests? Characteristics of Swamp Forests Savanna: Savanna and Grassland explained Savanna - Types of Savanna


Academic Questions in Biology

Please check out our Test Your Knowledge page to see all Questions and Answers

In a food chain, the primary consumers are classified under trophic level  _____.

  • A. Zero

  • B. One

  • C. Two

  • D. Three

  • E. Four

  • F. Five

Cold blooded animals are referred to as _____.

  • A. Homeotherms

  • B. Endotherms

  • C. Poilokitherms

  • D. Ectotherms

  • E. Thermotherms

  • F. None of the above

All reptiles are vertebrates.

  • A. True

  • B. False

_____ cells are responsible for the formation of osteoblasts.

  • A. Osteocytes
  • B. Chondrocytes
  • C. Chondroblasts
  • D. Osteoclasts
  • E. Osteoprogenitor cells
  • F. Osteoblastic

_____ is a bone that constitute the axial skeleton.

  • A. Clavicle
  • B. Scapula
  • C. Patella
  • D. Radius
  • E. Sternum
  • F. Femur

Which of the following is false concerning cartilages and bones?

  • A. Cartilage does not have a direct blood supply while bones have direct blood supply
  • B. The process of ossification replaces a cartilage to bone
  • C. The protein that makes up cartilage is called chondrin while that that makes up bone is called ossein
  • D. Cartilage grows from both ends while bones grow from one of its epiphysis
  • E. They both have living cells within them
  • F. Haversian system is absent in cartilage but present in bones

A diagram showing the movement of energy through a food chain is called a _____.

  • A. Food Chain
  • B. Food Web
  • C. Food Energy
  • D. Food Link
  • E. Food Flow
  • F. Food Pyramid

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

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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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NOTABLE POINTS IN Biology

For a thing to be considered living, it must possess all the basic characteristics of life. These include:

  1. Movement

  2. Respiration

  3. Nutrition

  4. Irritability or Sensitivity

  5. Growth

  6. Excretion

  7. Reproduction

  8. Death

  9. Adaptation

  10. Competition

Please read the explanations on all the basic characteristics of life here

During strenuous exercises like sprinting or running, your body may actually work in the shortage of oxygen. During this time, your body owes oxygen (called oxygen debt) and it must be replenished or repayed after the exercise is stopped. This is why you breathe excess of oxygen after you stopped the exercise.

This is the concept of anaerobic respiration

Food Chain - Len Academy

A food chain is a diagram that shows the relationship between plants and animals within a habitat on the basis of how they rely on each other for food.

Note: Habitat is a place where an organism live. It is of three types:

  • Terrestrial (Land)
  • Aquatic (Water)
  • Arboreal (Treetops)

You can read on food chain here

The term Biology originated from two Greek words. They are:

  • Bios: means life.

  • Logos: means knowledge or to study.

Biology can therefore be defined as the study of life

Anything that has life is generally considered as a living organism (or organism). All living organisms must be able to carry the following activities:

  1. Movement

  2. Respiration

  3. Nutrition

  4. Irritability or Sensitivity

  5. Growth

  6. Excretion

  7. Reproduction

  8. Death

  9. Adaptation

  10. Competition

The above listed points are often regarded as the basic characteristics of life. You can memorize them using the acronym -> MR. NIGER DAC.

You can read on the introduction to biology and the basic characteristics of life here

The gas used in the manufacture of food by plants is Carbon dioxide or Carbon(IV)oxide or CO2

Plants manufacture food through a process called photosynthesis.

Please read on photosynthesis here

It is noteworthy to state that plants are the only orgnisms that take away CO2 from the atmosphere