Respiratory system

what are the narrowest branches of the bronchus

bronchioles
what do the bronchus and bronchioles do

they control airflow in lungs
what does the bronchioles have an abundance of

abundance of smooth muscle
what does sympathetic stimulation of the smooth muscle cause and parasym activation

causes bronchodilation and parasym activation causes bronchoconstriction
what is bronchoconstriction in anaphylaxis causes by

because of histamine released by mast cells
what is each alveolus associated with

each alveolus is associated with an extensive network of capillaries
what are the two types of cells composing alveolar epithelium
- type 1- pneumocytes -site of gas diffusion
- type 2- pneumocytes- produce surfactant
what do surfactant do

surfactant prevents alveoli collapsing by reducing surface tension throughout the lung
describe surfactant

surfactant is oily containing phospholipids and proteins, keeps alveoli open
what does surface tension cause

causes them to collapse and stick together during expiration
what is external respiration
- breathing
- gas diffusion in alveoli
- transport of O2 and CO2
what is internal respiration
- cellular processes
- cytoplasm & mitochondria

Author

Claireg05

363318

Card Set

Respiratory system

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Updated

2023-10-31T13:17:41Z

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