PDH Exam 2 Questions and Answers Latest Update 2025 Graded A+
What is the respiratory system function? - Answers Transfers oxygen from air to blood and disposes
waste (carbon dioxide)
Explain the structure of the respiratory system. - Answers 1. Air breathed in through nasal cavity
2. Joins to pharynx then through larynx
3. Larynx joins to trachea (windpipe)
4. Epiglottis sits above larynx to prevent food entering trachea
5. Trachea splits into primary bronchi
6. Bronchus divides into smaller branches, bronchioles
7. Contains small sacks, alveoli
8. Deoxygenated blood exchange in and out of blood through capillaries
Where does deoxygenated and oxygenated blood travel (respiratory system) - Answers From right side
of heart to the lungs for disposal of carbon dioxide.
In lungs, blood picks up oxygen and blood is returned through left side.
Another word for breathing - Answers pulmonary ventilation
What is the diaphragm? - Answers Thin dome shaped muscle on lower ribs controlled by body's nerves
How do the ribs lift in breathing - Answers The diaphragm and intercostal muscles contract
What happens when the ribs lift in breathing - Answers Air pressure is lowered in the alveoli causing air
to flow quickly through respiratory tract into lungs
What happens when the diaphragm relaxes - Answers Ribs resume normal positions and lungs retract,
carbon dioxide flow out of lungs
What happens to breathing during exercise? - Answers Becomes deeper because more muscles are
involved to assist the diaphragm. This increases volume of air that can be breathed in.
Where is the larynx located? - Answers between pharynx and trachea
What does the epiglottis do? - Answers prevents food from entering the trachea
What does the trachea split into? - Answers right and left bronchi
What does the trachea do? - Answers The trachea transports the air to and from the lungs.
, What do alveoli do? - Answers Carry out gas exchange in the body
Where does external respiration occur? - Answers In the lungs because of high levels of carbon dioxide
and low levels of oxygen.
When does breathing become deeper and more frequent? - Answers Exercise
What do tissue cells do? - Answers Use oxygen frequently, for each volume of oxygen they produce
equal carbon dioxide
Where does the tissues carbon dioxide move to? - Answers From tissue to capillaries and veins
Where does internal respiration occur? - Answers tissues
What does the circulatory system do? - Answers Transports blood around the body
What does the circulatory system consist of? - Answers heart, blood vessels, blood
What are the components of blood? - Answers plasma, red blood cells, white blood cells, platelets
What is plasma? - Answers Materiel between blood cells, makes up 55%
What do red blood cells do? - Answers Carry hemoglobin, give blood colour, and combine with oxygen
allowing blood to carry oxygen from lungs to tissues
What do white blood cells do? - Answers Protect against bacteria
What are platelets? - Answers cell fragments
What do platelets do? - Answers help blood clot in event of cut or injury
What does the heart muscle do? - Answers contacts, forcing blood to the lungs
How does blood get to the lungs from the heart? - Answers Pulmonary artery
What does blood do when it reaches the lungs? - Answers Offloads carbon dioxide and becomes
enriched with blood
How does the blood return to the heart from the lungs? - Answers The pulmonary vein
What happens after the blood goes through the pulmonary vein? - Answers Travels to the aorta and out
to the rest of the body
How does the blood reach the rest of the body - Answers Through a complex series of arteries and
smaller capillaries.
What happens when blood passes around the body? - Answers Nutrients pass to body cells and waste
product are returned to the blood.
What is the respiratory system function? - Answers Transfers oxygen from air to blood and disposes
waste (carbon dioxide)
Explain the structure of the respiratory system. - Answers 1. Air breathed in through nasal cavity
2. Joins to pharynx then through larynx
3. Larynx joins to trachea (windpipe)
4. Epiglottis sits above larynx to prevent food entering trachea
5. Trachea splits into primary bronchi
6. Bronchus divides into smaller branches, bronchioles
7. Contains small sacks, alveoli
8. Deoxygenated blood exchange in and out of blood through capillaries
Where does deoxygenated and oxygenated blood travel (respiratory system) - Answers From right side
of heart to the lungs for disposal of carbon dioxide.
In lungs, blood picks up oxygen and blood is returned through left side.
Another word for breathing - Answers pulmonary ventilation
What is the diaphragm? - Answers Thin dome shaped muscle on lower ribs controlled by body's nerves
How do the ribs lift in breathing - Answers The diaphragm and intercostal muscles contract
What happens when the ribs lift in breathing - Answers Air pressure is lowered in the alveoli causing air
to flow quickly through respiratory tract into lungs
What happens when the diaphragm relaxes - Answers Ribs resume normal positions and lungs retract,
carbon dioxide flow out of lungs
What happens to breathing during exercise? - Answers Becomes deeper because more muscles are
involved to assist the diaphragm. This increases volume of air that can be breathed in.
Where is the larynx located? - Answers between pharynx and trachea
What does the epiglottis do? - Answers prevents food from entering the trachea
What does the trachea split into? - Answers right and left bronchi
What does the trachea do? - Answers The trachea transports the air to and from the lungs.
, What do alveoli do? - Answers Carry out gas exchange in the body
Where does external respiration occur? - Answers In the lungs because of high levels of carbon dioxide
and low levels of oxygen.
When does breathing become deeper and more frequent? - Answers Exercise
What do tissue cells do? - Answers Use oxygen frequently, for each volume of oxygen they produce
equal carbon dioxide
Where does the tissues carbon dioxide move to? - Answers From tissue to capillaries and veins
Where does internal respiration occur? - Answers tissues
What does the circulatory system do? - Answers Transports blood around the body
What does the circulatory system consist of? - Answers heart, blood vessels, blood
What are the components of blood? - Answers plasma, red blood cells, white blood cells, platelets
What is plasma? - Answers Materiel between blood cells, makes up 55%
What do red blood cells do? - Answers Carry hemoglobin, give blood colour, and combine with oxygen
allowing blood to carry oxygen from lungs to tissues
What do white blood cells do? - Answers Protect against bacteria
What are platelets? - Answers cell fragments
What do platelets do? - Answers help blood clot in event of cut or injury
What does the heart muscle do? - Answers contacts, forcing blood to the lungs
How does blood get to the lungs from the heart? - Answers Pulmonary artery
What does blood do when it reaches the lungs? - Answers Offloads carbon dioxide and becomes
enriched with blood
How does the blood return to the heart from the lungs? - Answers The pulmonary vein
What happens after the blood goes through the pulmonary vein? - Answers Travels to the aorta and out
to the rest of the body
How does the blood reach the rest of the body - Answers Through a complex series of arteries and
smaller capillaries.
What happens when blood passes around the body? - Answers Nutrients pass to body cells and waste
product are returned to the blood.
