Download Lesson 05 - The respiratory system

The Respiratory System
Video on the respiratory system (3.5 min)
The respiratory system is responsible for the uptake of ___________________ into the blood and the release of _________________ out the blood. Structure and functions of the parts of the respiratory system There are two possible ways air can enter into our bodies. Through our a) ________________ or/and our b) __________________
When air enter through our nose it goes into the nasal cavity where the air is a) _______________ by the blood vessels in our nose, b) _____________ by the hairs, and c) moistened by the mucus.
This prepares the air to enter our lungs. The air is not changed as much when we breath through our mouths. Why do we sometimes breath through our mouth? Why can it be an advantage?
After the nasal cavity the air will enter into the pharynx. The pharynx carries both air and _________________.
After the pharynx, the air will pass a flap that prevents food from going into the lungs. This is called the _________________. This is why we cannot breath and _________________ and the same time. Below is the larynx, which contain the _______ ___________ which are responsible for making _____________.
nose
oxygen sound carbon dioxide food swallow epiglottis warmed mouth vocal cords filtered 1
The air then travels down a 15 cm tube into the lungs called the _______________. This tube has rings made of _______________ that help keep it open so air can easily pass through. ___________are tiny hair­like structures that are present on the trachea to filter out dust. The cilia carry the dust up and we ____________ it out. The trachea splits into two branches called ___________ (plural) ________________ (singular). These are also lined with cilia.
The bronchi then branch into smaller tubes called ________________.
The air finally enter into the grape­like sacs called ______________. This is where the gas __________________ occurs with the ________________. The act of inhaling is accomplished by two sets of muscles:
1) The diaphragm which is located __________ you lungs.
2) The intercostal muscles which are located _____________ your ribs.
Both contract to accomplish an inhalation. The diaphragm contracts and pull the lungs __________ while the intercostal muscles pull the lungs up and ___________. This expands the lungs which causes air to rush in for an inhalation. The muscles ____________ and the lungs contract during an exhalation. down alveoli exchange bronchi below relax between cartilage blood cilia cough bronchioles bronchus trachea out 2
Label the following diagrams
What are these? ____________ What will be the difference between the ones on the left and right? ___________________________________________
___________________________________________
What are these sacs? ____________ What happens here? ___________________________________________
___________________________________________
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Questions
1. What is the main function of the respiratory system?
2. How is the respiratory system related to the circulatory system?
3. Trace the path of an oxygen molecule in the air from the time it enters the body until the time it enters the bloodstream. Name each structure it passes or enters in the correct order.
4. Describe the muscle actions responsible for expiration and inspiration.
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