Exam 3 - Chapter 22 Deck Flashcards
How many groups is the respiratory system divided into? Name them
2 - Upper/lower respiratory tract
Role of the nose in the upper respiratory tract
First to receive air
Conchar increases surface area for air
Helps remove pathogens and moistens/warms up the air
Olfaction (contains sensory cells to help detect smell)
Role of the pharynx in the upper respiratory tract
Passageway for air and food
Provides resonating chamber for speech sounds
Houses tonsils
Role of larynx in the lower respiratory tract
Voice box
Connects pharynx to trachea
Contains vocal folds that produce sounds when they vibrate
Consumption of food causes muscle on larynx to contract and epiglottis moves down to close opening of larynx
Role of trachea in the lower respiratory tract
Extends from larynx to primary bronchi
Permits expansion of muscular esophagus when food is swallowed
Role of bronchi in the lower respiratory tract
Trachea branches into right primary bronchus that enters right lung and left primary bronchus enter left lung
Entrance into lungs includes division of primary bronchi into smaller branches known as terminal bronchioles at the end of the conducting zone
Supply lobes of the lungs
Aid in gas exchange
Role of lungs in the lower respiratory tract
Paired organs in the thoracic cavity
Enclosed and protected by pleural membrane
Lobule
Primary location for respiration
Flow of air from the nasal cavities to the alveoli
Nasopharynx → laryngopharynx → larynx → trachea → primary bronchi → secondary bronchi → bronchioles → terminal bronchioles → respiratory bronchioles → alveoli
Structure of lungs
Paired organs in the thoracic cavity
Enclosed and protected by pleural membrane
Contains lobes and fissures
Primary location for respiration
R-lung is larger than L-lung due to location of heart
Structure of bronchial tree
Term to describe structure of bronchi and its branches (as they form structure of upside down tree)
Trachea branches into right primary bronchus that enters right lung and left primary bronchus that enter left lung
Entrance into lungs includes division of primary bronchi into smaller branches
Supply lobes of the lungs
Aid in gas exchange
Structure of bronchioles
Upon entering lungs, primary bronchi further divides to form smaller and smaller diameter branches
Terminal bronchioles are the end of the conducting zone
Structure of alveoli
When conducting zone ends at the terminal bronchioles, respiratory zone begins
Respiratory zone terminates at the alveoli and the “air sacs” found within the lungs
Microscopic sac-like structures that diffuse oxygen and carbon dioxide
Alveolar membrane
Thin membrane composed of mainly type I alveolar cells that allows for diffusion to occur between capillaries and alveoli
Direction of gas driven by simple diffusion
Capillary epithelium in alveolar membrance
One layer of epithelial cells in capillary walls sitting on basement membrane
Name the layers that make up the respiratory membrane (in order)
Layer of type I and type II alveolar cells → epithelial basement membrane → capillary basement membrane → capillary endothelium
Layer of type I and type II alveolar cells
Associated alveolar macrophages
Epithelial basement membrane
Underlying alveolar wall
Capillary basement membrane
Often fused to the epithelial basement membrane
Describe the process of blood supply to the lungs
Blood enters the lungs via pulmonary arteries (pulmonary circulation) and the bronchial arteries (systemic circulation)
Blood exits the lungs via pulmonary veins and the bronchial veins
Ventilation-perfusion coupling process
Ventilation-perfusion coupling
Vasoconstriction in response to hypoxia that diverts blood from poorly ventilated areas to well ventilated areas
Perfect match between how much air is passing through alveoli and how much blood is passing through pulmonary capillaries (must be in perfect ratio)
Mechanism for breathing/pulmonary ventilation
Air flows between atmosphere and the alveoli of the lungs because of the alternating pressure differences created by contraction and relaxation of respiratory muscles – inhalation and exhalation
Inhalation
Active phase
Diaphragm and external intercostals contract (which enlarges thorax/chest)
Lung volume increases and air pressure inside decreases
Atmospheric pressure (outside) is higher than pulmonary pressure (inside)
Air moves into lungs
Exhalation
Passive phase
Diaphragm and external intercostals relax (thorax/chest gets smaller)
Lung volume decreases and air pressure inside increases
Pulmonary air pressure is greater than atmospheric pressure
Air moves out of lungs