Breathing/gas exchange

Breathing/gas exchange

How do we exchange gases in the body?

There are many organs involved in gas exchange....

• On the next slide you will be given a range of organs involved

• Try and pick the correct organs from the list

Multiple Select

Which of the following are involved in gas exchange?

• Trachea

• Oesophagus

• Stomach

• Lungs

• Ribs

Multiple Select

Which of the following are involved in gas exchange?

• Pancreas

• Intercostal muscles

• Small intestine

• Diaphragm

• Nose

There are many organs involved in gas exchange, these include:

Diaphragm, mouth, larynx, lungs, trachea, rib cage and nose

On the next few slides you will need to describe what each of these does

Take a good look, this will be helpful for your follow up questions

Take a good look, these will be helpful for the next few questions

Breathing

As we breathe in our diaphragm and ribs move to help us to move air in and out of our chests. Place one hand on your chest and the other on the side of your ribs, inhale and exhale slowly and deeply. What do you feel happening?

Open Ended

What happens as you breathe in and out? Describe what you notice/feel.

Have a read through, this will help you with the next few questions

Multiple Choice

As you breathe out, what does your diaphragm do?

• Relax

• Contract

Multiple Choice

As you breathe in what happens to the pressure inside your chest?

• It increases

• It decreases

Multiple Choice

When do your intercostal muscles relax?

• Breathing in

• Breathing out

You also need to know about the alveoli, inside your lungs. These are the tiny air sacs where gas exchange takes place. In particular, you should know what adaptations they have which enable them to do their job.

Multiple Select

Which of these are adaptations of alveoli?

• Long, finger-like structure increases surface area

• The membrane is only one cell thick which means gases have a short diffusion distance

• Lots of tiny capillaries so gases can pass easily into the blood stream

• Moist

• Lots of enzymes so there are tiny molecules suitable for diffusion

Well done

From here, gases pass into the blood stream and travel around the body - see https://youtu.be/Futnu_6NmQo

Oxygen is used by the mitochondria in all our cells to produce energy from respiration. Carbon Dioxide is a waste product, which is delivered to the lungs by our bloodstream.

Poll

On a scale of 1-5, 5 being excellent and 1 meaning not very confident at all, how would you rate your confidence on breathing and gas exchange?

• 1

• 2

• 3

• 4

• 5