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Author Question: What is the major source of respiratory tract secretions in the normal lung? a. Bronchial glands ... (Read 117 times)

Jkov05

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on: Jul 16, 2018
What is the major source of respiratory tract secretions in the normal lung?
 
  a. Bronchial glands
  b. Clara cells
  c. Goblet cells
  d. Mast cells

Question 2

What can the release of histamine and other chemical mediators from the mast cells in the air-ways cause? 1. Bronchoconstriction 2. Bronchodilation 3. Vasoconstriction 4. Vasodilation
 
  a. 2 and 4 only
  b. 1 and 3 only
  c. 2 and 3 only
  d. 1 and 4 only


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zogaridan

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Reply #1 on: Jul 16, 2018
Answer to Question 1

ANS: A
Normally, the respiratory tract produces approximately 100 ml of mucus per day. Most of the mucus formed in the larger airways is produced by the bronchial glands.

Answer to Question 2

ANS: D
Mast cells are also found in the submucosa and release numerous and potent vasoactive and bronchoactive substances such as histamine. Histamine causes vasodilation and bronchocon-striction, acting directly on smooth muscle.


Jkov05

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Reply 2 on: Jul 16, 2018
Great answer, keep it coming :)

apple

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Reply 3 on: Yesterday
Excellent

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