Gas exchange

When you breathe, your lungs take in ___ and remove ___.

• air/oxygen

• oxygen/carbon dioxide

• carbon dioxide/waste

• waste/air

The air sacs that are covered with capillaries where gas exchange takes place

• bronchi

• lungs

• oxygen

• alveoli

Which of the following are features of the alveoli that adapt them to gas exchange?

I. High surface area

II. Thin walls

III. Dry surfaces

• I and II only

• I only

• II and III

• I, II, and III

What adaptations does the alveoli have for efficient gas exchange?

• thick walls

• thin walls

• small surface area

what is found around alveoli?

• capillaries

• pleura

• lymphatic nodes

• saliva

During gas exchange what enters from alveoli to the capillaries?

• CO₂

• CO

• O₂

• nitrogen

What is the main function of the respiratory system?

• to provide oxygen and remove carbon dioxide from the body

• to bring oxygen to the body

• to break down food and absorb nutrients

• to remove oxygen from the body and deliver carbon dioxide

Which of the following is true about the plot of the oxygen dissociation curve?

• The partial pressure of oxygen is on the y axis, and the partial pressure of haemoglobin is on the x axis
• The partial pressure of oxygen is on the x axis and the partial pressure of haemoglobin on the y axis
• The partial pressure of oxygen is on the x axis and the percentage saturation of haemoglobin is on the y axis
• The partial pressure of oxygen is on the x axis and the percentage saturation of oxygen is on the y axis

Which of the following is true about percentage saturation of blood in region C

• That is the percentage saturation of blood that is entering the lungs

• That is the percentage saturation of blood leaving the lungs

• That is the percentage saturation of the alveolar air space

• That is the percentage saturation of the plasma

Using the graph, what does graph A represent?

• graph of fetal haemoglobin

• graph of sickle celled haemoglobin

• graph of adult haemoglobin

• graph of denatured haemoglobin