A) What is structure A (1 mark) B) Describe what is at the proximal (superior) a

Question

A) What is structure A (1 mark) B) Describe what is at the proximal (superior) and distal end of structure A (2 marks) C) i) The innermost lining of this structure, like all hollow tubes, is lined by which primary tissue type? (1 mark) i) The innermost lining of this structure is very special - how is it classified? (be specific -you may have to do some research) (2 marks) D) This structure has C-shaped rings. What kind of cartilage are the rings made of, and what primary tissue type is it? (2 marks) E) Give 3 examples of where else in the body you would find this type of cartilage (3 marks) F) Describe the function of the cartilage in the structure labelled A (2 marks)

Explanation / Answer

A. The structure is trachea.

B. Trachea starts at caudal end of larynx.... And end by bifurcating into bronchi at the end of carina. It is 4 inches. long.

C. 1. The innermost lining of the structure is mucous membrane of columnar epithelium.

C. 2. The innermost lining is very special as it is composed of ciliated pseudostratified columnar epithelium contain goblet cell which produce some sticky discharge which prevents the foreign body to reach to lungs.

D. C shaped rings are made up of hyaline cartilage. It is made up of type 2 collagen and chondroitin sulphate.

E. Hyalin cartilage also found in ventral end of the ribs, articular surface of bones,Trachea. Bronchi.

F. Cartilages in trachea(labelled A) helps to prevent collapse.

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