Breathing is the process of moving air into and out of the lungs. The process depends on a muscle called the diaphragm. This is a large, sheet-like muscle below the lungs. Inhaling, or breathing in, occurs when the diaphragm muscle tightens. This increases the size of the chest. This too decreases air pressure inside the lungs. This action allows air and gases to enter the lungs. Exhaling, or breathing out, occurs when the diaphragm muscle relaxes. This decreases the size of the chest. This increases air pressure inside the lungs. This action allows for air to leave the lungs. When you inhale, air enters the respiratory system through your nose and ends up in your lungs, where gas exchange with the blood takes place. What happens to the air along the way? In the nose, mucus and hairs trap any dust or other particles in the air. The air is also warmed and moistened. Next, air passes through a passageway that is connected to the windpipe. The air then finds its way to the lungs. In the chest, the windpipe splits so that air enters both the right and left lung.

What happens to the air pressure inside the lungs when the diaphragm muscle tightens?

The family across the street has a cat. He is a cute black kitty named Dillon. The cat is about two years old, and the family has had him for about a year. He is an indoor cat who is not allowed to go outside. The children like to play with Dillon because he still acts like a kitten. Dillon jumps around, and chases flies, beetles and spiders. When he plays with the children, he sometimes uses his paws to attack them, but he doesn't try to hurt them with his claws. Dillon is a great cat but he has one problem: he likes to eat bread. The family only feeds him cat food, never human food like steak or potatoes. But the cat likes the smell of bread so much that he tries to find it everywhere he can. Dillon jumps up on the kitchen table when a sandwich is there, and tries to carry it away. He finds loaves of bread from the store on the floor and claws through the wrappers. The cat climbs into the bread cupboard looking for hot dog and hamburger buns. The family tries to make Dillon stop getting into the bread by spraying him with water when he goes after bread. They yell at him when he walks on the table. But Dillon does not listen. The kitty keeps trying to find bread to eat. The family thinks that the man who took care of Dillon when he was a very young kitten must have been a baker or cook, and that's why Dillon likes the smell and taste of bread so much!

How old is Dillon?

As his car slid downtown on Tuesday morning the mind of Arnold Thorndike was occupied with such details of daily routine as the purchase of a railroad, the Japanese loan, the new wing to his art gallery, and an attack that morning, in his own newspaper, upon his pet trust. But his busy mind was not too occupied to return the salutes of the traffic policemen who cleared the way for him. Or, by some genius of memory, to recall the fact that it was on this morning young Spear was to be sentenced for theft. It was a charming morning. The spring was at full tide, and the air was sweet and clean. Mr. Thorndike considered whimsically that to send a man to jail with the memory of such a morning clinging to him was adding a year to his sentence. He regretted he had not given the probation officer a stronger letter. He remembered the young man now, and favorably. A shy, silent youth, deft in work, and at other times conscious and embarrassed. But that, on the part of a stenographer, in the presence of the Wisest Man in Wall Street, was not unnatural. On occasions, Mr. Thorndike had put even royalty frayed, impecunious royalty, on the lookout for a loanat its ease. The hood of the car was down, and the taste of the air, warmed by the sun, was grateful. It was at this time, a year before, that young Spear picked the spring flowers to take to his mother. A year from now where would young Spear be? It was characteristic of the great man to act quickly, so quickly that his friends declared he was a slave to impulse. It was these same impulses, leading so invariably to success, that made his enemies call him the Wisest Man. He leaned forward and touched the chauffeur's shoulder. "Stop at the Court of General Sessions," he commanded. What he proposed to do would take but a few minutes. A word, a personal word from him to the district attorney, or the judge, would be enough.
What is the Wisest Man's name?