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Circulation and Respiration. How Does the Heart and Lungs Work Together?. ENGAGE. Engage 1:

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circulation and respiration

Circulation and Respiration

How Does the Heart and Lungs Work Together?



Engage 1:

Obtain a pluck from Owen’s Sausage or local butcher. Demonstrate how air goes in and out of their lungs. The lungs are very elastic and will expand greatly. Allow the students to look at the heart, lungs and trachea.


Explore 1

Construct a Lung Model

Have students work together in groups to construct a lung model

measuring lung capacity
Measuring Lung Capacity

Explore 2

In this investigation, you will determine the tidal volume and vital capacity of your lungs.

respiratory system structures
Respiratory System Structures

Pair of Lungs

Series of passageways





Diaphragm (thin sheet of smooth muscle)

respiratory system function
Respiratory System Function

Involves all mechanisms that get O2 to the cells via the bloodstream

Gets rid of the waste gas CO2

Formation of ATP for energy

path air takes
Path Air Takes

Air enters nose or mouth

Passes Pharynx

Moves past epiglottis

Passes through larynx


Lungs and their passageways

respiratory system
Respiratory System

I bring in the oxygen that is carried on the red blood cells…without me you’d have no oxygen to carry!

I carry the CO2 (waste gas) out of the body.

The circulatory system needs me for gas exchange.

The muscles need oxygen to move.

The brain needsmy oxygen to think.

the lungs
The Lungs
  • A lung weighs about 600 grams
  • Total LUNG CAPACITY of an adult is between 5 and 6 liters
  • A NORMAL breath is about 0.5 Liters
  • VITAL LUNG CAPACITY is the maximum amount of air that can be EXHALED at ONE time
the diaphragm
The Diaphragm
  • A large sheet of MUSCLE at the BOTTOM of the rib cage.
  • When you INHALE, this muscle DROPS and the rib cage RAISES
  • This motion INCREASES the VOLUME of the lung cavity causing a LOW PRESSURE area
  • EXTERNAL air pressure FORCES air INTO the lungs
the pharynx
The Pharynx
  • A muscular organ at the back of the throat
  • The respiratory and digestive systems branch here
  • The epiglottis is located in the pharynx
the trachea
The Trachea
  • Also called the “WINDPIPE”
  • A NON-MUSCULAR tube leading from the PHARYNX to the LUNGS
  • There are RINGS of CARTILAGE spaced along this rube to keep it open
bronchi and bronchioles
Bronchi and Bronchioles
  • Bronchi
    • The two branches of the trachea leading to the two lungs
  • Bronchioles
    • The smallest branches of the bronchial tubes
the aveoli
The Aveoli
  • The air sacs at the end of each brochioles



Andrea knows that her breathing rate increases when she starts to run or exercise. She thinks it is because she needs to increase her oxygen intake. Does increased activity have an affect on the amount of carbon dioxide she exhales? Design an experiment that will answer her question.

Color your Lungs



Upon completion of the human lung model the student will explain the mechanism of breathing through the use of their model, they will name the gases the primary gases that compose air, and they will name the gases we exhale. A grade of pass or fail will be given.

After creating the respiration model the student will list six components of respiration: Nose, trachea, bronchi, bronchioles, alveoli, and lung.