Biology: Human Respiratory System

Human Respiratory System

• The human body needs oxygen to breathe, and it gets oxygen from the air around us.
• Without oxygen, the body would be like a car without fuel, and it's essential for survival.

Breathing Process

• When we breathe in, oxygen is taken in through the nostrils, where tiny hair obstructs dust particles.
• The air then passes through the windpipe (Trachea), which filters the air we inhale.
• The Trachea branches out into two tubes called Bronchi, where tiny hair called Cilia move back and forth to move mucus inside.
• The mucus is a sticky substance that collects germs and other particles that might harm the lungs.

Lungs

• The Bronchi carry air into each lung, with the right lung having three lobes and the left lung having two lobes.
• The left lung is slightly smaller in size to give space to the heart.
• The lobes are filled with small and spongy air sacs called alveoli, where the exchange of oxygen and carbon dioxide happens.
• It is here that the blood picks up oxygen and lets go of carbon dioxide.

Diaphragm

• The Diaphragm is a dome-shaped muscle located beneath the lungs that contracts when we breathe in and expands when we breathe out.
• It separates the chest cavity from the abdominal cavity.

Trivia

• The lungs are the only organs that can float on water.
• A person breathes approximately 20,000 times in one day.

Human Respiratory System

• Oxygen is essential for human survival, and the body obtains it from the air.
• The absence of oxygen would render the body unable to function, similar to a car without fuel.

Breathing Process

• Oxygen is inhaled through the nostrils, where tiny hair obstructs dust particles.
• The air then passes through the trachea, which filters the inhaled air.
• The trachea branches into two tubes called bronchi, where cilia (tiny hair) move back and forth to move mucus inside.
• Mucus is a sticky substance that collects germs and other particles that might harm the lungs.

Lungs

• The bronchi carry air into each lung, with the right lung having three lobes and the left lung having two lobes.
• The left lung is smaller in size to accommodate the heart.
• The lobes are filled with small, spongy air sacs called alveoli, where oxygen and carbon dioxide are exchanged.
• It is in the alveoli that the blood picks up oxygen and releases carbon dioxide.

Diaphragm

• The diaphragm is a dome-shaped muscle located beneath the lungs that contracts during inhalation and expands during exhalation.
• The diaphragm separates the chest cavity from the abdominal cavity.

Trivia

• The lungs are capable of floating on water due to their unique structure.
• An average person takes approximately 20,000 breaths in a day.

Human Respiratory System

• Oxygen is essential for human survival, and the body obtains it from the air.
• The absence of oxygen would render the body unable to function, similar to a car without fuel.

Breathing Process

• Oxygen is inhaled through the nostrils, where tiny hair obstructs dust particles.
• The air then passes through the trachea, which filters the inhaled air.
• The trachea branches into two tubes called bronchi, where cilia (tiny hair) move back and forth to move mucus inside.
• Mucus is a sticky substance that collects germs and other particles that might harm the lungs.

Lungs

• The bronchi carry air into each lung, with the right lung having three lobes and the left lung having two lobes.
• The left lung is smaller in size to accommodate the heart.
• The lobes are filled with small, spongy air sacs called alveoli, where oxygen and carbon dioxide are exchanged.
• It is in the alveoli that the blood picks up oxygen and releases carbon dioxide.

Diaphragm

• The diaphragm is a dome-shaped muscle located beneath the lungs that contracts during inhalation and expands during exhalation.
• The diaphragm separates the chest cavity from the abdominal cavity.

Trivia

• The lungs are capable of floating on water due to their unique structure.
• An average person takes approximately 20,000 breaths in a day.