Science- Respiratory System Flashcards
Breathing is the process that…
Brings oxygen into your body
Breathing begins when…
You inhale air through nose or mouth> filtered by cilia and mucus> pharynx> epiglottis> larynx> trachea> bronchi> lungs> bronchioles> alveoli
Cilia
Mucus
Tiny hairlike projections on inside respiratory passages
Thick slippery sticky substance that lines various structures and organs in body
Trap dirt + other particles + push particles back out nostril or down digestive system
Pharynx
Tube at the meeting point of the airway passage and esophagus
Epiglottis
Small flap that covers the airway tube during swallowing to prevent choking
Larynx
Voice box
Contains vocal cords, vibrate as air passes through - producing the sounds of your voice
Trachea
C-shaped bands (cartilage)
Airway passage that leads from larynx to lungs
Bronchi
2 tubes that branch out from trachea into right and left lungs
Bronchioles
small air tubes branching out from bronchi
Alveoli
Tiny, thin walled sacs (gas exchange)
Gas exchange
Process in which carbon dioxide passes into alveoli and oxygen into capillaries
Capillaries
Network of tiny blood vessels
Emphysema
Causes alveoli walls to lose elasticity > breathing increasingly difficult
Smoking
Linked to heart disease
#1 cause of lung cancer
Destroys cilia lining your respiratory system
Respiration
Act of breathing
Cellular respiration
Process in which chemical energy from food changed into energy the cells use to function
Thoracic cavity
Chamber of body protected by rib cage
Rib cage
Bony frame formed by ribs around chest
Disphragm
Sheet of muscle in lower chest moves downward with each inhalation
Vital capacity
Greatest volume of air that can b expelled from the lungs after taking deepest possible breath
Residual air
Volume of air remaining in lungs after maximal expiratory effort
Nasal cavity
Warms, moistens and cleans air
Lungs
Deliver oxygen for cellular respiration and excrete carbon dioxide
Major organs of respiratory system
