3) Lungs
are made up of
Answers
Answer:
The right lung is divided into three different sections, called lobes. The left lung has just two lobes. The lobes are made of sponge-like tissue that is surrounded by a membrane called pleura, which separates the lungs from the chest wall. Each lung half has its own pleura sack.
Explanation:
I HOPE IT HELPS YOU
breathing lungs
Every cell of the body needs oxygen to stay alive and healthy. Your body also needs to get rid of carbon dioxide. This gas is a waste product that is made by the cells during their normal, everyday functions. Your lungs are specially designed to exchange these gases every time you breathe in and out.
Let’s take a closer look at this complex system.
Lung anatomy
This spongy, pinkish organ looks like two upside-down cones in your chest. The right lung is made up of three lobes. The left lung has only two lobes to make room for your heart.
Bronchial tree
The lungs begin at the bottom of your trachea (windpipe). The trachea is a tube that carries the air in and out of your lungs. Each lung has a tube called a bronchus that connects to the trachea. The trachea and bronchi airways form an upside-down “Y” in your chest. This “Y” is often called the bronchial tree.
The bronchi branch off into smaller bronchi and even smaller tubes called bronchioles. Like the branches of a tree, these tiny tubes stretch out into every part of your lungs. Some of them are so tiny that they have the thickness of a hair. You have almost 30,000 bronchioles in each lung.
Each bronchiole tube ends with a cluster of small air sacs called alveoli (individually referred to as alveolus). They look like tiny grape bunches or very tiny balloons. There are about 600 million alveoli in your lungs. The small bubble shapes of the alveoli give your lungs a surprising amount of surface area — equivalent to the size of a tennis court. This means there’s plenty of room for vital oxygen to pass into your body.
SUMMARY
Each lung is divided into lobes. The bronchial tree running through your lungs is made up of the windpipe, bronchi, bronchioles, and alveoli.
The respiratory system
The lungs are the main part of the respiratory system. This system is divided into the upper respiratory tract and the lower respiratory tract.
The upper respiratory tract includes the:
Mouth and nose. Air enters and leaves the lungs through the mouth and nostrils of the nose.
Nasal cavity. Air passes from the nose into the nasal cavity, and then the lungs.
Throat (pharynx). Air from the mouth is sent to the lungs via the throat.
Voice box (larynx). This part of the throat helps air to pass into the lungs and keeps out food and drink.
The lower respiratory tract is made up of the:
lungs
trachea (windpipe)
bronchi
bronchioles
alveoli
Other parts of the respiratory system help your lungs to expand and contract as you breathe. These include the ribs around the lungs and the dome-shaped diaphragm muscle below them.
3-D model of the lungs
The lungs are surrounded by your sternum (chest bone) and ribcage on the front and the vertebrae (backbones) on the back. This bony cage helps to protect the lungs and other organs in your chest.
How your lungs work
WHAT IS RESPIRATION?
Respiration is made up of two phases called inspiration and expiration: You inhale (breathe in) oxygen during inspiration. You exhale (breathe out) carbon dioxide during expiration.
The pathway of a breath
When you breathe, air enters through your mouth and nose and travels:
include: