Biology

Negative feedback mechanism in homeostasis

len Alfred Ajibola - Thu, 06th February, 2020 @ 2:24 PM

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Academic Questions in Biology

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Male Reproductive System - Len Academy

From the above diagram, which of the organ below isn't a requirement for the male reproductive system?

  • A. Bladder

  • B. Ureter

  • C. Glans Penis

  • D. Testis

  • E. Bulbourethral Gland

  • F. Epididymis

A walnut shaped male accessory sex organ located between the bladder and penis is the _____.

  • A. Ductus Ejaculatorii

  • B. Bulbourethral Gland

  • C. Prostate Gland

  • D. Ductus Deferens

  • E. Seminal Vesicles

  • F. Epididymis

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



Negative feedback mechanism (Homeostasis):

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 (or attempts to cool) your body from the sun's hot rays.

Meanwhile, 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


You can read on the red blood cells and hemoglobin here.


Still using the above instance as a point of reference, you will also notice that the amount 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 the process of sweating. As a result, 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 (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 (that is; sweating) at the beginning of our example 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 here.


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

On a cold day, the body's metabolic rate reduces. 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 are as follows:

  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. However, the point to note is: 'Such processes must eventually stop; else the individual will die from the continuous loss of water'. Once again, 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).


From our explanations above, 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 an eventual decrease in the function of a homeostatic process.

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