This structure prevents entry of food particles into the trachea upon swallowing:

The two main muscles of inspiration are the diaphragm and the internal intercostal muscles

These are the structures in the respiratory membrane:

What is the epithelium in “Q? 

What structure is labeled with a “B”?

MHC -1 is found on all body cells with a nucleus. It serves to expose intracellular pathogens.

The lungs are directly covered with this membrane:

Where on the figure the tracheal cartilage?  Enter the corresponding letter for this structure.

Question 5: Refer to Source C and answer the questions that follow: 

2.5 Watter een van die volgende pas nie? Die stoomenjin het bygedra tot industriële vooruitgang deur __________. (1)