The light in the room is not very good.

"Whew...... ...... "Bai Chun sat on the dry straw pile, breathing heavily.

It was as if he had just finished a fierce battle.

The long-term strenuous activity made the young Bai Chun's body a little unbearable. Not only did it take effort, but the oxygen supply was also a little inadequate, and Bai Chun felt that his whole body was very sore.

This is probably because when he does physical exercise, he breathes more anaerobic than aerobic respiration.

Aerobic respiration. With the participation of oxygen, cells completely oxidize and decompose organic substances such as sugars through the catalytic action of enzymes, producing carbon dioxide and water, and releasing a large amount of energy at the same time. Aerobic respiration is the main form of respiration in higher animals and plants.

Anaerobic respiration. Under the condition of no oxygen or lack of oxygen, cells through the catalytic action of enzymes, the process of incomplete oxidation and decomposition of organic substances such as glucose into alcohol plus carbon dioxide, or fusan acid, and at the same time release a small amount of energy. There is no molecular oxygen involved in this process, and the incomplete oxidation products after oxidation are mainly alcohol or fusan acid.

Why do people feel muscle soreness after a long period of strenuous exercise? Because anaerobic respiration will produce fuqi acid, and ruic acid is acidic, and the human body absorbs ruic acid relatively slowly, most of which remains in the body, so it will feel muscle soreness.

In general, the concentration of fusan acid rises when the energy of the tissue cannot be met by aerobic respiration, when the tissue does not receive enough oxygen, or when the tissue is unable to process oxygen fast enough. Being in a state of anaerobic respiration for a long time is harmful to the human body.

Main Differences Between Aerobic Respiration and Anaerobic Respiration.

Aerobic respiration is mainly within the mitochondria, whereas anaerobic respiration is mainly within the cell matrix. Aerobic respiration requires the participation of molecular oxygen, whereas anaerobic respiration does not require the participation of oxygen. The products of aerobic respiration are carbon dioxide and water, and the products of anaerobic respiration are alcohol or uric acid. Aerobic respiration releases more energy, while anaerobic respiration releases less energy.

The connection or common ground between aerobic and anaerobic respiration.

Objective. All animals and plants need to undergo respiration, and animals and plants decompose organic matter in the body to release energy through respiration, so as to meet the energy needs of their growth and other life activities.

Changes in matter and energy. Both are the decomposition of organic matter to release energy.

Reaction process. The first step in both types of respiration is the breakdown of glucose into pyruvate in the cytoplasmic matrix.

The perspective of biological evolution. The atmosphere of the primordial Earth did not contain oxygen. Therefore, the respiration mode of organisms at that time was anaerobic respiration. When autotrophic organisms such as cyanobacteria appeared, there was oxygen in the atmosphere, and aerobic respiration occurred. It can be seen that aerobic respiration is developed on the basis of anaerobic respiration.

Comparison of the advantages and disadvantages of aerobic and anaerobic respiration.

Energy supply. For every mole of glucose broken down by aerobic respiration, 2,870 kilojoules of energy can be released. Anaerobic respiration, on the other hand, can only release 196.65 kilojoules of energy for every mole of glucose that is broken down. For aerobic organisms, most of the energy required for life activities is provided by aerobic respiration, and the energy provided by anaerobic respiration cannot meet the needs of maintaining biological life activities. Therefore, from the point of view of providing energy, aerobic respiration is better than anaerobic respiration.

The end product. The end products of aerobic respiration are carbon dioxide and water, which are harmless to living organisms. Whereas, the end product of anaerobic respiration is fusan acid or alcohol and carbon dioxide. The formation of fusan acid can cause some adverse reactions in animals, such as muscle soreness. Too much ruxin acid may also cause homeostatic changes, ruic acid poisoning, etc. Alcohol has a strong toxic effect on plant cells. Therefore, the anaerobic respiration of aerobic organisms is basically to help organisms get through some undesirable environments of hypoxia, and cannot be carried out for a long time. Therefore, from the perspective of whether the final product is toxic or not, aerobic respiration is better than anaerobic respiration.

Behind Bai Chun, the disheveled woman was also breathing abnormally.

Suddenly, she pounced!

Suddenly, Bai Chun felt that he was wrapped in a huge ball of tender soft matter, and he was so cool that he was about to take off!

Soon, however, half of his refreshment was gone.

A fair-skinned and slightly cold delicate hand wrapped around Bai Chun's neck. The other white jade hand pinched and twisted the tender skin and flesh on Bai Chun's body.

"Why are you doing this to me?"

Bai Chun's heart was cold: It's over, Ma Rena is going to settle the account after she is happy.

"Why do this to me? You are bland! Ma Rena pounded Bai Chun's mouth vigorously with her small pink fist, and said hurriedly, "I love you to death!" ”

"Stop, wait!"

"What? What did you say? Bai Chun couldn't care about the pain on her body, and hurriedly asked her, "I didn't hear clearly." Can you say that again? ”

"I ......," said Marena, "I hate you to death!" ”

Hey? Wrong! Bai Chun's heart was a little flustered.

However, he quickly came up with a solution: a simple and effective solution, and a non-effective solution.

Bai Chun immediately turned around and took Ma Rena in his arms roughly.

"You're bullying me? I'm going to punish you severely! Bai Chun roared angrily, and once again pressed her down on the dry straw pile.

"Ahh You bastard, let me go! ”

"Ahh Ah......h

Ma Rena, who was pressed down by Bai Chun, let out an unwilling scream of shame. It was a delicate and beautiful woman, who was fighting fiercely and unyieldingly against her mind and body.

But this shy and annoyed scream of hers quickly turned into another scream.

"Hmm!"

Onomatopoeia...... It was a beautiful mixture of surprise, humiliation, reluctance and satisfaction.

The good times are passing......

In the blink of an eye, the date is July 6th.

After more than a day of rest and recuperation, Bai Chun felt that his body had regained his vitality and became more robust. It's time for another big deal.

Bai Chun was lying on the bed, bored flipping through the biology textbook.

"Hmm. Wu Daisha is a good woman, you must not let her go......" Bai Chun looked through the textbook absentmindedly while judging someone.

"Smack...... Well...... Syllable...... Well...... Ah......h

It turned out that it was Bai Chun's mobile phone ringing.

"Who's calling?" Bai Chun guessed in his heart as he picked up the mobile phone on the bed.

Bai Chun pressed the answer button on the screen.

A sweet female voice came: "Bai Chun, what are you doing now?" ”

After hearing Feng Lanqi's voice, Bai Chun showed a knowing smile.

"Whew...... ...... said," Bai Chun said in a pretended voice, "I'm exercising in the morning." Whew......"

After hearing his panting, Feng Lanqi on the other end of the phone showed a worried look, and she said with concern: "Really? You have to be careful not to get too intense and exhaust your body. ”

"Whew...... Call...... I feel much better after listening to you. Don't worry, I'll take care of myself. ”

At this time, Feng Ximeng, who was standing next to Feng Lanqi, raised his mobile phone and pressed the power button. The phone screen lights up.

Feng Lanqi noticed Ximeng's movements, and after glancing at the time on her phone screen, she soon discovered that Bai Chun was lying.

"Hmph, ghosts will believe your nonsense!" Feng Lanqi grabbed her mobile phone with both hands and said to someone angrily, "It's half past eight now, what are you still doing in the morning?" Morning exercises, a ghost! ”

Feng Lanqi: "You're lying, right?" ”

"Huh?" Bai Chun pretended to be surprised, "You have discovered this?" ”

Feng Lanqi: "What the hell are you doing now?" ”

Bai Chun: "Actually, I haven't eaten breakfast yet." What do you think? Surprised, right? ”

"Lan Qi," Feng Ximeng said to Feng Lan Qi, "give me the phone, and I'll tell him." ”

"Hmm." Feng Lanqi handed the phone to Ximeng.

As soon as Feng Ximeng took her mobile phone, she said angrily to Bai Chun on the other side of the phone: "Bai Chun, come to my house now, immediately!" ”

Bai Chun: "Is there any reason?" ”

Feng Ximeng: "My mother is not at home!" ”

(End of chapter)

Degree of literature

Degree of literature