Watch "Once Upon a Time... Life: Season 1" on Netflix Pakistan

The world of cells is incredible! Activating enzymes, stopping viruses, and managing the body’s police force: it’s all in a day’s work for Teacher.

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After the first cell is fertilized, division and diversification take place to create the 60 trillion cells of the human body.

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The body’s police force is taught to neutralize its enemies (microbes and viruses), which reproduce at an alarming rate! It’s a very complex task.

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Red blood cells, the body’s police force, are created in the bone marrow but sometimes, the factory breaks down and wayward policemen come out. Uh oh!

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The steadfast red blood cells have come down with the flu! Pedrito and Psi get some help from the Teacher’s antibodies to beat the enemy.

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Pedrito cuts his finger with a dirty knife. While the platelets try to cure the wound, the white blood cells fight off the filthy invaders.

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Globus takes Hemo and Globina on a tour through the human body’s cathedral: the heart and circulatory system. It’s an impressive adventure.

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Air bubbles travel from the nose to the lungs. In the swampy, mucus-filled areas, they meet the red blood cells that transport them around the body.

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Teacher introduces Hemo and Globina to the most mysterious organ: the brain. They learn about behavior, the senses, and much more.

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The body’s messengers run around sending and receiving information about feelings like hunger and cold. They work day and night and never take breaks.

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Eyes are magical! They break down and transmit images to the brain. What happens if a speck of dust gets into one? It’s tear enzymes to the rescue.

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The ear is composed of cells that sense vibrations and transmit them to the brain. Then, the brain transforms them into words and sounds.

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Skin is the first barrier against external aggression and helps eliminate waste. From cuts and scrapes to bug bites, it stays pretty busy.

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Yum! Candy! But sugar strengthens the bacteria around the gums and attacks the tooth enamel, which can cause cavities.

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After a tasty meal the food starts its journey to the stomach where it will be broken down depending on what properties it has. But don’t overdo it!

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The liver is fundamental. It doesn’t weigh a lot but it uses almost as much oxygen as the heart! It makes proteins, corpuscles, and helps heal cuts.

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Toxic elements head to the kidneys where they are categorized. The good ones are salvaged but the bad ones are sent to the bladder. Have a good trip!

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The huge lymph network transports everything to the body’s factories. Infectious intruders beware! This place is well protected.

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The architecture that protects the body’s organs is magnificent! However, even the slightest fracture can cause significant damage.

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Muscles account for almost half the weight of the human body. They also need a ton of energy to do their jobs correctly.

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Combat teams act as preventative barriers and are prepared to defend the cell’s nucleus against toxic gases and contaminants.

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Vaccines bring us so many benefits! People who don’t get vaccinated run the risk of contracting a disease that is stronger than our natural defenses.

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At the heart of the hypothalamus, Teacher shows us how this region sends out orders to satisfy all the body’s needs.

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A walk in the forest is the perfect way to learn about the extraordinary food chain that exists between the sun, vegetation, animals, and man.

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Pedrito is 8 years old and is tired after a long day. When he goes to bed, Teacher and his helpers observe the activity that continues during sleep.

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Pedrito wants to know why his grandpa can’t play ball anymore, so he tells Pedrito an old story about a sphinx.

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