respiratory system Flashcards
function of respiratory system
- take in oxygen for respiration in cells
- excrete co2 and water vapour which are waste of respiration
- allow gaseous exchange to occur between blood and lungs
nose
filters, warms and moistens the air before it reaches the lungs
trachea
takes air down to the lungs
bronchus
takes air into lungs
bronchiole
takes air to alveoli
alveolus
air sacs surrounded by capillaries where gas exchange occurs
pleura
protects lungs from infection
ribs
protect lungs
intercostal muscles
expand and contract the chest
diaphragm
sheet of muscle beneath the lungs that controls the volume of the chest by contractions
gaseous exchange in the alveoli
oxygen from alveoli diffuses through walls of alveoli and capilarries, into the blood
co2 from blood through walls of capillaries and alveoli into alveoli
breathing in
- intercostal muscles contract , causing the ribs to move out and up
- diaphragm contracts, causing it to move down
- volume of the chest increases
- pressure on lungs decreases
- air is sucked in
breathing out
-intercostal muscles relax, causing the ribs to move in and down
-diaphragm relaxes, causing it to move up
-volume of chest decreases
-pressure on the lungs increases
air is forced out
interactions of the respiratory organs w each other
- nose
- trachea, bronchi, bronchiole is a system of tubes that carry air in and out of the lungs
- intercostal muscles and diaphragm relax and contract at the same time to draw air in and push air out of the lungs
interactions w other systems
- heart pumps deoxygenated blood through pulmonary artery to the lungs to get rid of co2 and take 02
- capillaries that surround the alveoli join together to form pulmonary vein
- all cells of all systems receive o2 that’s been taken into the blood by the respiratory system
- when eating, the epiglottis covers the trachea to prevent food going down the wrong way
