Seven

In class, Mrs. Yeti explains biology in detail. But all the students in the class were lulled to sleep by the explanation given by Mrs. Yeti.

"Auuuu" Lina complained when Anita pinched her.

"Sleepy all the time. Here's a candy so I won't be sleepy." Reprimanded Anita while holding out two pieces of chocolate candy.

"Thanks Ta, you really know what I want best." Lina praised Anita while tearing the candy wrapper filled with chocolate.

"Dammit."

Ervan, who has a sensitive nose and is a chocolate lover, tries to sniff where the smell of chocolate is coming from. Sniffing from left to right, I couldn't find the chocolate scent either. When sniffing backwards, nil results. At try again to sniff forward. Three times he sniffed "uush, uush, uush" aaahhh it turns out that the smell of chocolate was coming from the two of them.

"Suuts, suuts ask for the chocolate candy." Ervan asked by nudging the pen towards Anita's hand.

"Aaah your nose is sensitive when you smell chocolate, here." Anita grumbled while handing over two pieces of chocolate candy.

"I really am a chocolate lover Ta, so my nose is sensitive when I smell chocolate."

"Van, do you understand what Mrs. Yeti said about the relationship between white blood cells and body health? I don't really understand what Mrs. Yeti said earlier." Lina asked Ervan.

"It's easy, after class I'll explain later Lin, now just follow the lesson first, don't sleep hahaha."

"Reply you Van."

"Whatever."

Lina tried to keep paying attention to biology class, even though her mind was constantly thinking about the results of the olympic selection exam this morning. He hopes to become a student representing the Chemistry Olympiad from his beloved school. Unfortunately, even though Lina was majoring in science, she never liked biology lessons that memorized a lot. For him, memorizing Math, Physics, Elements and Chemistry formulas is far more interesting than Biology. It was this dislike that made Lina even more bored during biology class, coupled with her teacher Mrs. Yeti, who, when explaining questions, read guidebooks without giving real examples in life. Students whose brains are mediocre must be sick of hearing it.

The class wall clock shows 13.55 am. Soon the bell will ring. Lina, who didn't like biology, was already packing to go home, and didn't forget to keep her promise to Ervan to explain the relationship between white blood cells and health.

"Kriiinggggg, kriiinggggg, kriiinggg," the bell has sounded. Bu Yeti also ended her teaching session.

"Okay students, that's enough for today. Do you have any questions?"

"No ma'am." Answer all the students enthusiastically

"Fine, if there aren't any. Welcome home, see you tomorrow."

"Yes ma'am." Answer all students simultaneously.

🟣🟣🟣

"Eiittttss, don't run away Van. You still owe me." Lina said while pulling Ervan's carrying bag from behind.

"Nothing, I don't owe you any money Lin."

"It's not Van's money owed, it's his explanation about the link between white blood cells and health."

"Oh that one, you said that earlier. This instead says debts, debts, debts all the time."

"Yeah, sorry. So what's this got to do with Van?"

"So like this Lin, in the body there are blood cells, red blood cells (round) and white blood cells (moving) circulate in our body more than 1,000 times every day. Our white blood cells move actively among the red blood cells, look for bacteria or pathogens that cause disease. In our bodies there are at least 35 billion white blood cells (4,500-11,000 white blood cells per microliter of blood for a total of 5 million microliters of blood)." Ervan's explanation while taking a deep breath and intending to continue his explanation again.

"So Van?"

"Patience Lin, give me a chance to breathe first."

"Yes, yes. Have a good breath."

"Continuing Lin, our white blood cells are the main and most important part of our body in protecting our immune system. Without them, our bodies would be hopeless against bacterial or viral infections which they actually handle every second. Without them, all bacteria on the skin or our intestines can expand uncontrollably. As long as our bodies are healthy, we produce selected white blood cells. And they come in several types with their respective tasks. So be thankful and excited to live Lin's life." Obviously Evan.

"Thank you very much Van, it's not wrong if you take part in the Biology Olympiad representative selection. Hopefully you can become a Biology Olympiad representative from our school Van."

"Amen Lin."