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A Love Letter to My Body’s Biology
Your body is a gift you were born with,
And there’s nothing quite like it.
There is so much going on within you,
So, let’s take a look inside our body.
First, there is the heart, who is beating tirelessly,
Working day and night timelessly.
It pumps and supplies your body parts with blood,
Blood contains hemoglobin, which is why it looks red!
It palpitates in excitement when you are nervous,
But you can hardly feel it beat, on a regular basis.
It pumps out blood, which is always on a cycle,
It is needed for every organism’s survival.
It contains platelets, without which you will bleed out,
Phagocytes, which put any foreign body to rout,
And red blood cells which are basically post men,
Who run around in your arteries and veins.
The nose is very important as it enables you to breathe,
It has a hollow space called the nasal cavity beneath,
The mucus and the cilia trap the germs, purifying the entering air.
The air passes through the pharynx the esophagus and the trachea share,
And down the windpipe it goes.
Oxygen is taken by the blood while carbon dioxide exits back through the nose.
The blood is purified by the lungs,
Between which the heart lies and drums.
The lungs are a network of air sacs,
And facilitates gaseous exchange.
Under it is the diaphragm, a muscular sheet,
Without which the thoracic column would be incomplete.
The control centre of our body is the brain,
And without it, all the other organs would go in vain.
The heart wouldn’t beat, and the lung wouldn’t purify,
If there was no brain and neurocytes.
Down it, runs the spinal cord,
Which transmits info that can’t be ignored.
It's got the cerebrum, the seat of will power,
And the cerebellum, controlling your balance so you don’t topple over.
And then the brain stem, who controls your involuntary actions
And the supplementary neurons which carry information transactions.
The nerve’s got a cell body, you call it the cyton,
And a long, long tail, carrying impulses, called the axon.
The window to the world outside is the human eye,
The lacrimal glands above it secrete tears when you cry.
The outer sclera houses the conjunctiva and cornea, which allow light rays to enter.
The amount of light entering is controlled by the pupil in the center.
The coloured choroid prevents scattering of light,
The image falls on the retina and there happens the perception of sight.
Now, let’s talk about the amazing working of the ear,
It helps you maintain body balance and listen and hear.
The auditory canal carries soundwaves to the tympanum,
Which then resonates the sound to the ear ossicles and as an outcome,
The Organ of corti in the cochlea receives the vibrations and sends out impulses.
The semicircular canals, utriculus and sacculus control your body balances.
Your skin is called the jack of all trades,
The melanin in it imparts different skin shades.
It is a mechanical barrier preventing entry of germs,
It contains two layers of epidermis and dermis,
It has cells concerned with touch and pain,
The sensitivity of the skin enables Braille learning in the blind.
Your bones are what protect the vital body parts of you,
They coordinate with your muscles to help you move.
To your vital organs like the brain, the bones offer protection,
And the marrow within them is concerned with blood cell production.
A bone is connected to a muscle with a tendon,
A bone and another, the ligaments hold on.
And then, there is the digestive system,
Which starts with the mouth and ends with the rectum,
It breaks down the food you eat,
With the many enzymes the intestines and stomach secrete,
And then the body gets rid of the undigested foods
And that is how the process concludes.
And then the metabolic wastes is broken down to urea in the liver,
She also breaks down the bad fat, nicotine and the liquor,
The kidney and its nephrons then start ultrafiltration,
And continue with urine production.
The urine is carried through the ureters,
And expelled through the urethra, the ending of the bladder.
The nervous system and the endocrine system go hand in hand,
The complex system houses every ductless gland.
These glands pour their secretions directly in your bloodstream,
Now, you know how the nervous system and the endocrine system work as a team.
Starting with the pituitary hanging from the hypothalamic stalk,
The glands secrete chemical messenger hormones which help the organs talk.
Capping your kidneys are the adrenal glands, secreting adrenaline,
This is the emergency hormone, giving you an internal rush just in time.
And then the pancreas, located above your bowels,
Secretes insulin and helps maintain your blood sugar levels.
The thyroid glands release thyroxine, but the overall arbitrary
Lies in the master gland, the pituitary.
The hormones play an important role in sexual maturity,
When your reproductive organs mature, you attain biological puberty.
The influence of the Follicle stimulating and Luteinizing hormone of the pituitary
Helps in hormone secretion of the male testicle and female ovary.
The testicles produce sperms with the help of hormone testosterone
And the ovaries produce eggs with the help of hormones estrogen and progesterone.
Boys, going through puberty, experience growth spurts,
Their shoulders outgrow almost every one of their shirts.
Their Adam’s apples enlarge, and the pitch of their voice turns grave,
They may have excessive facial hair growth which they would have to shave.
Adolescent boys may find it hard to accept their bodies the way it is,
But sooner or later, each and every boy will learn to love this body of his.
When a girl child’s ovaries are fully matured,
One of them releases an egg, which waits for its turn to get fertilized.
The walls of the uterus, the endometrium, then start growing,
However, when the egg is left unfertilized, the endometrium begins peeling.
Out the vagina goes the tissue, in the form of discharge and blood.
The menstrual cycle continues every month. The endometrial cells grow and shed.
Now, let’s talk about the process which brought us into existence,
The fascinating biology of human reproduction.
It starts with production of the sex cells, you call them gamete
When a male’s sperm and a female’s egg meet and greet,
They fuse in the oviduct. This is what we call fertilization.
Once a zygote is made, it attaches to its mommy’s womb. We call this implantation.
The woman is said to be pregnant once implantation is done,
Based on the sex chromosomes on the gametes,it can either be a daughter or a son.
The male can produce sperms with either an X or a Y chromosome,
While the female can only produce eggs with an X chromosome.
When X and Y meet, the parents welcome a prince, their lovely baby boy.
If X and X meet, the parents welcome a princess, their pride and joy.
The zygote, with the help of stem cells, undergoes multiple cell divisions
It goes from a few-celled zygote to an embryo and then to a fetus.
The placenta is a beautiful structure, attaching the baby to the uterus.
It facilitates exchange of nutrients and waste and the growth of the umbilicus.
During pregnancy, the mother’s uterus expands thousand times its original size,
To provide room for the blooming bud inside.
The baby is surrounded by the amniotic sac,
Which protects the baby from any mechanical shock.
The period of development of a baby in its mother’s uterus is gestation.
And the baby is expelled out of the body through the vagina during parturition.
Prior to childbirth, the momma experiences a rush of oxytocin,
She undergoes painful contractions, and her water is broken.
That’s how you and I were born,
After spending 9 months long,
rolling about inside our mommy’s’ wombs.
That’s how the miracle of life starts and blooms.
So, now you know, the biology behind maternal love,
She let us live rent-free inside her body; Mothers are equivalent to the God above.
To keep this amazing body healthy, you got to exercise regularly,
Stay away from junk foods, and from bad carbs, particularly.
Say goodbye to your problems, and no to your stress,
Sleep like a baby, your mind free from any distress.
There’s nothing wonderful like the human’s anatomy and physiology,
Believe me when I say your body is much better than today’s technology.
So, try and keep your body fit and healthy,
Cuz, it’s a gift you were born with, whether or not you are wealthy.
Truly, the human body is a fascinating creation,
So give your body some well-deserved appreciation!!!
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This article is written by P.Amritha of class x of RJ Mantra English school Virudhunagar,
Tamilnadu . She has passion towards writing stories of all sorts. She has got Desire towards reading. She is also good at Academics ,especially in Science. Her love towards Biology had prompted her write one of this article. She is a TEDX speaker and very good speaker.
To add this she is a member of Gavel club for the past five years and has completed 10 cc in Gavel club. She is a creative writer.