Module 12: Respiratory System Flashcards
(284 cards)
What is respiration?
the mechanical process of breathing, the exchange of air between the lungs and the external environment
external respiration
the exchange of air at the lungs, oxygen is inhaled into the air spaces of the lungs and immediately passes into capillaries surrounding the air spaces, simultaneously, CO2 is exhaled
internal (cellular) respiration
involves an exchange of gases at the level of the cells within all organs of the body
nose
air enters through two openings called nostrils or nares
nasal cavity
lined with a mucous membrane and fine hairs (cilia) to help filter out foreign bodies, as well as to warm and moisten the air
paranasal sinuses
hollow, air-conditioning spaces within the skull that communicate with the nasal cavity
pharynx (throat)
air reaches this part of the body after the nasal cavity and has 3 divisions
What are the 3 divisions of the nasal cavity?
- nasopharynx, 2. oropharynx, and 3. laryngopharynx
nasopharynx
contains the pharyngeal tonsils (adenoids) which are collections of lymphatic tissue. More common in children and if enlarged can block air passageways
oropharynx
close to the mouth with palatine tonsils
palatine tonsils
two rounded masses of lymphatic tissue
larayngopharynx
serves as a common passageway for food from the mouth and air from the nose. It divides into the larynx (voice box) and the esophagus
esophagus
leads into the stomach and carries food to be digested
larynx
contains the vocal cords and is surrounded by pieces of cartilage for support
thyroid cartilage
the largest and in men is commonly referred to as the Adam’s apple
epiglottis
a flap of cartilage attached to the root of the tongue prevents choking or aspiration of food (it acts as a lid over the opening of the larynx)
trachea (windpipe)
a vertical tube about 4.5 inches long and 1 inch in diameter and kept open by about 16-20 C-shaped rings of cartilage separated by fibrous connective tissue
bronchial tubes or bronchi (singular: bronchus)
branches into right and left and composed of delicate epithelium surrounded by cartilage rings and a muscular wall each side leads to a lung
bronchiols
small bronchial branches
terminal bronchiole
narrows into alveolar ducts, which end in collections of air sacs called alveoli (singular: aveolus)
alveoli (singular: aveolus)
There are about 300 million present in both lungs, each one is lined with a one-cell-thick layer of epithelium and allows the exchange of gases
What type of artery surrounds alveoli?
capillaries
erythrocytes
exist in the blood and carry oxygen away from the lungs to all parts of the body and carbon dioxide back to the lungs for exhalation
pleura
a double-layered membrane that covers each lung