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The Thorax

The Thorax

The Thorax

You will learn about the structure of the thorax, which is the chest located between neck and abdomen.

The thorax is a fancy word for what do you think?

The lungs are obviously very important for the body. How do you think they are protected from damage?

How do you think the lungs are kept separate from the abdomen?


The thorax

The lungs are enclosed in the thorax by the ribcage (12 pairs of ribs and the sternum) and a muscular sheet of tissue called the diaphragm, which separates the thorax from the abdomen. Joining each rib to the next are muscles called intercostal muscles (costas refers to 'ribs').


The trachea and lungs

When we breathe in, air passes down the trachea. The trachea splits into two bronchi, one leading to each lung. Each bronchus divides into smaller bronchioles, which eventually end in microscopic air sacs called alveoli. It is here that gaseous exchange will take place.


The pleural membranes

The inside of the thorax is separated from the lungs by two thin, moist membranes called pleural membranes. Between the two membranes is the pleural cavity. **** It is filled with a thin layer of liquid called pleural fluid.

What do you think is the function of pleural fluid?

How many pairs of ribs are there in the human ribcage?

True or false? The intercostal muscle is a sheet of muscle that separates the thorax and abdomen.

Select the order which correctly states the route air will take when we breathe in.


What does letter A point to?


What does letter B point to?


What does letter C point to?


What does letter D point to?