How can we help?
You can also find more resources in our
Select a category
Something is confusing
Something is broken
I have a suggestion
What is your email?
What is 1 + 3?
Anatomy and Physiology (Respiratory system)
Which of the following is not part of the upper respiratory system?
The conducting zone does NOT act to
Does none of the above
The nose connects with the pharynx through the
Which of the following is a passageway for air, food and water?
The opening to the pharynx from the mouth is called
This structure prevents food or water from entering the trachea.
During swallowing, which structure rises?
These are triangular pieces of mostly hyaline cartilage located at the posterior and superior border of the cricoid cartilage.
Pitch is controlled by
Tension of the vocal chords
This is located anterior to the esophagus and carries air to the bronchi.
This is the primary gas exchange site.
Which of the below tissues maintains open airways in the lower respiratory system?
Which of the below tissues provides the functions of the inner layer of the conducting organs?
ciliated pseudostratified columnar epithelium with goblet cells
The point where the trachea divides into right and left primary bronchi is a ridge called
Which of the below tissues forms the exchange surfaces of the alveolus?
simple squamous epithelium
These are cells of the alveoli that produce surfactant.
Type II alveolar cells
This is direction of diffusion of gases at capillaries near systemic cells.
Oxygen out of blood , Carbon dioxide into blood
This is direction of diffusion of gases at the alveoli of the lungs.
Oxygen into blood , Carbon dioxide out of blood
Exhalation begins when
Inspiratory muscles relax
This means the lungs and the chest wall expand easily.
The conducting airways with the air that does not undergo respiratory exchange are known as the
Respiratory dead space
This is the sum of the residual and the expiratory reserve volume.
Functional residual capacity
Which of the following is not a factor that the rate of pulmonary and systemic gas exchange depends on.
Force of contraction of diaphragm
Which is the dominant method of carbon dioxide transport?
Dissolved in plasma as bicarbonate ions
When blood pH drops then the amount of oxyhemoglobin _______ and oxygen delivery to the tissue cells ________________.
Which is a factor that does NOT affect hemoglobin's affinity for oxygen?