Su Ji looked at the two long slits on his face, to be precise, it should be called gill clefts, and he was surprised and a little worried. The surprise is naturally because of the growth of new organs, and the new organs indicate new abilities, and the worry is that anyone who suddenly has two slits on his face will not be worried.

Su Ji turned his head to the left, and gently pulled open the gill cleft on the right side of his face with both hands, not to mention that he was not comfortable and did not feel pain, that feeling was like opening his mouth, that's all.

He tentatively reached into his fingers, wanting to touch the internal structure, and when he thought of watching people kill fish and use their hands to buckle out the red organs in the gills of fish, it was not a nostril that could be dug casually, and finally he didn't dare to reach in.

In any case, the growth of gills means that he has the ability to breathe underwater from now on.

What can I do when I have the ability to breathe underwater?

Being a lifeguard is too big and too much.

The underwater treasure hunt feels very good. Even if many treasures were fished up, there must still be many treasures that were not fished up. As long as you salvage a little thing, it will be developed from then on.

It's really not good to catch seafood, big crabs, lobsters or something.

It's to worry about the beasts in the sea...... Actually, there is no need to worry so much. Marine mammals are generally very friendly to humans, and they will even rescue humans, but sharks, including great white sharks, do not like to attack humans, and the reason why they attack humans is that they treat humans as seals.

Su Ji couldn't wait to test whether he had the ability to breathe underwater.

He returned to the pool, jumped down into the deep water, swam and swam close to the bottom, walked and boxed underwater, cruised around the pool, and swam in synchronized ...... Even though you have gills, why do you still have no oxygen?

Su Ji frowned, he wanted the key reason, that is, he did have gills, but he hadn't used it, and he didn't know how to use it.

He swam to the edge of the pool and lay on the edge of the pool playing with his phone. He had to figure out how to use the gills.

Su Ji Baidu the structure and use of the gills of fish.

The gills are the respiratory organs of the fish, the outermost part is the gill cover, and the cavity inside the gill cover is called the gill cavity.

Lifting the gill cover, you can see that there are four gills on each side of the throat, and each gill is divided into two rows of gill pieces, each row of gill pieces is composed of many gill filaments arranged in array, and many small gill filaments are born on both sides of each gill filament.

When the fish is in the water, each gill plate, gill filament, and gill lobe are fully opened, so that the contact area between the gills and the water is expanded, increasing the chance of ingestion of dissolved oxygen in the water. There are microvessels in the gill patches, where the epidermis is very thin, and when the blood flows through it, the gas exchange is completed, absorbing oxygen and sending away carbon dioxide.

Due to the alternating opening and closing of the mouth and gill cover, water can be continuously entered from the mouth into the oral cavity, through the pharynx to the gill cavity, contact with the gill filament, and then discharged from the gill hole to the outside, and the respiration of fish is completed in this process.

Some of these sharks die if they don't move because they don't have a backup system for a gill-oriented breathing pattern. They must swim with their mouths open, sucking in water through their half-open mouths, forcing seawater into the area through the gill slits for gas exchange.

Suji now knows how to do it.

After he enters the water, he can't hold his breath with his mouth closed, but he has to drink water, and then let the water go through the gills to drain out, so that he can achieve the effect of underwater breathing.

Does that mean he's going to drink bathwater?

Su Ji looked at the calm water surface of the pool and hesitated for a moment, but he only hesitated for a few seconds, after all, the pool water in this pool was clean, he plunged into the water, took a sip of water, and then ...... Now the question is how to get this water out through the gills.

It's certainly not drinking water.

He closed his eyes, pinched his nose, and tried to squeeze the water into his cheeks, which worked, and he didn't feel anything special after using this method to get the water flowing through his gills.

It may be that his current lung capacity is huge, and even oxygen can be stored in the blood, and the little oxygen he breathed underwater just now is not obvious at all.

Su Ji began to toss and turn in the water until there was no oxygen, took a deep breath of water, and then squeezed the water into the cheeks, letting the water flow through the gills...... It's a little feeling, but it's not enough, the income is completely not enough to spend, and one breath like this is not enough to consume.

Su Ji surfaced, gasped for air, swam to the pool again, and picked up his phone again.

He has a lot of ideas that he needs to back up with data right now.

The amount of oxygen in the air is higher than that in water because oxygen, although soluble in water, is only slightly soluble in water.

Look at the source of oxygen in the water.

On the one hand, it is supplemented by the atmosphere, and under the action of atmospheric pressure, the oxygen in the air penetrates into the water. Even when the oxygen concentration of the water reaches a saturated state, the water releases excess oxygen into the air. The intensity of light, the amount of air pressure, and the temperature of the water all affect the amount of dissolved oxygen in the water.

The amount of dissolved oxygen in water is constantly changing.

On the other hand, the photosynthesis of plants in the water due to sunlight causes plants to absorb carbon dioxide and release oxygen.

There are no plants in the pool, and the oxygen comes almost entirely from atmospheric pressure, so there is a possibility that there will be less oxygen than the normal water source.

Then the lungs of mammals and the gills of fish have evolved to adapt to their own living environment. There is no way to compare who is superior. However, in terms of gas exchange efficiency and utilization, mammalian lungs have a large number of alveoli and other structures, which are much higher than those of fish gills.

Seeing this, Su Ji nodded.

If this is not the case, even if he can breathe in the water, because there is no way to achieve the efficiency of normal breathing in the water, he must work harder if he wants to truly achieve the effect of free movement in the water.

Su Ji soaked in the pool all afternoon, constantly practicing breathing in the water, striving to do it as soon as possible without deliberately absorbing water, and then squeezing the water into the cheeks to let the water pass through the gills, so that he could breathe freely underwater, and then the next goal was to absorb more water, and even drain water while sucking water, striving to get a lot of oxygen in one breath.

At night, he also soaked in the pool, practiced until late at night, had a supper, and fell asleep in bed.

On Friday night, Su Ji received another WeChat message from Xia Houyue.

Xia Houyue: I'll go over tomorrow morning.

Su Ji: Okay.

Waiting until Saturday, Su Ji completely forgot about Xiahou Yue's coming, he was addicted to underwater breathing and became more and more proficient, as long as he didn't swim all the time and was strenuous activities, he could keep diving, and finally surfaced because he was too bored, ready to play with his mobile phone and take a break.

Get.

WeChat has seven unread.

Then six missed calls.

All from Xiahou Yue.