ALS 2304 VT Animal Anatomy Final Exam : Respiratory System

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  1. External nares
    nostrils; external openings to the respiratory tract
  2. nasal cavity
    the space inside the internal nose, divided into two halves by the median nasal septum
  3. internal nares
    communicates with pharynx
  4. Paranasal sinuses
    • air filled cavities located in frontal, sphenoid, ethnoid, and maxillary bones
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  5. What are the functions of the Paranasal sinuses?
    • 1. lighten the skull
    • 2. moisten air- the lungs hate dryness
    • 3. produce mucous
    •      a. Rhinitis- inflammation of mucous membrane in nose
    •      b. Sinusitis- inflammation of paranasal sinuses.
  6. Parts of the Nose
    • 1. external nares
    • 2. nasal cavity
    • 3. internal nares
    • 4. Paranasal sinuses
  7. Pharynx
    • connects nasal cavity and mouth to larnyx and esophagus.
    • commonly called the throat is directs food and air into the digestive and respiratory systems
  8. 3 regions of the pharynx
    • 1. nasopharynx
    • 2. oropharynx
    • 3. laryngopharynx
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  9. Regions of Pharynx Diagram
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  10. Larynx
    • "voice box"
    • located between laryngopharynx and trachea
  11. Functions of Larynx
    • 1. patent airway
    • 2. route air and food to proper channels
    • 3. voice production
  12. Epiglottis
    blocks larynx during swallowing
  13. Trachea
    "windpipe" is a cylindrical tube extending from the larynx to the division into right and left primary bronchi above the base of the heart.
  14. Bronchi divisions
    • Primary Bronchi
    •    -->Secondary bronchi
    •      -->Tertiary bronchi
    •        --> Bronchioles
    •          --> Terminal bronchioles
    •            --> Respiratory bronchioles
    •              --> alveoli duct
  15. 4 parts of Respiratory Membrane
    • 1. Alveoli; single layer of squamous epithelial cells (type I cells) on basal lamina
    • 2. Capillary wall
    • 3. Type II cells which secrete surfactant
    • 4. Alveoli: elastic fibers, alveolar pores & contain alveolar macrophages (dust cells)
  16. 3 steps in the mechanics of breathing
    • 1. pulmonary ventilation: mechanical movement of air into and out of the lungs
    • 2. External respiration is the exchange of gases between the lungs and the pulmonary capillaries
    • 3. Internal respiration is the exchange of gases between systemic capillaries and tissue.
  17. Inhalation
    • active process using inspiratory muscles (diaphragm and intercostal muscles)
    • as the diaphragm contracts, it increases the size of the thoracic cavity which causes the volume of the lungs to expand and decreases the pressure inside the lungs
  18. Forced Inspiration
    recruits extra muscles to inhale more. uses scalenes, sternocleidomastoid, and pectoralis minor
  19. Expiration
    • passive: depends on elasticity of lungs, elastic recoil of lungs and chest cavity
    • due to pressure gradients in the opposite direction of inspiration.
  20. Forced expiration
    active using abdominal wall muscles (oblique and transversus) to increase intra-abdominal pressure and depress the rib cage.
  21. Alveolar surface tension
    interface between gas and liquid where liquid molecules more strongly attracted to each other than gas molecules, resists increase in surface area
  22. surfactant
    interferes with cohesiveness of water molecules
  23. Respiratory volumes
    • 1. tidal volume
    • 2. inspiratory reserve volume
    • 3. expiratory reserve volume
  24. tidal volume
    volume during normal, quiet breathing
  25. Inspiratory Reserve volume
    extra volume during forced inspiration
  26. expiratory reserve volume
    amount of addition air that can be expired beyond tidal volume
  27. Dalton's law of partial pressures
    • total pressure of gas is the sum of pressure exerted independently by each gas.
    • partial pressure; proportional to percentage of each gas in total mixture
  28. which gas in our air has the highest partial pressure? the lowest?
    • highest: N2 =598
    • lowest: CO2= .3
  29. What is the value of our atmospheric pressure?
    760 mmHg
  30. Henry's law (dissolving gasses)
    • When in contact with liquid, each gas will dissolve proportional to its partial pressure.
    • volume of gas that will dissolve also depends of solubility
  31. External respiration
    • the exchange of gases between the lungs and the pulmonary capillaries where blood gains O2 and loses CO2
    • Partial pressure differences in gases drives movement
  32. Pressure differences during External respiration
    • Venous blood O2 = 40; Alveoli = 104
    • Venous blood CO2 = 45; Alveoli = 40
    • CO2 is more soluble than O2
  33. How thick is the respiratory membrane and why is this significant?
    • .5-1.0 um thick.
    • Anything that interferes with this causes gas exchange problems (ex: pneumonia)
  34. Internal respiration
    opposite movement of gas from external respiration
  35. How is oxygen transported by blood?
    • 98% is bound to hemoglobin and the rest is dissoved in plasma
    • Reduced hemoglobin binds O2 and becomes oxyhemoglobin
    • oxygen-hemoglobin dissociation curve: binding of 1 molecule of O2 makes it easier to bind more O2
  36. Oxygen-hemoglobin dissociation curve
    • binding of 1 molecule of O2 makes binding of more O2 easier
    • Unloading of 1 molecule O2 enhances unloading of next
    • O2 unloading accelerated at increased temperature and increased partial pressure (decreased pH); these are the responses to increased metabolism
  37. Impairments of O2 transport
    • Anemic hypoxia- low levels of hemoglobin
    • Ischemic hypoxia- exposed to less oxygen
    • Histotoxic hypoxia- exposure to cyanide gas
    • Hypoxemic hypoxia- CO poisoning
  38. How is CO2 transported?
    • 10% dissolved
    • 30% bound to carbaminohemoglobin
    • 60% carbonic acid and bicarbonate ions
  39. Internal Respiration Diagram
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  40. External Respiration Diagram
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  41. Haldane Effect
    • The lower the partial pressure of O2 and hemoglobin saturation, the more carbon dioxide is carried in blood.
    • this is because O2 and CO2 are competing for binding sites
  42. What are the two Locations of Neural respiratory control?
    • Medullary Respiratory Centers
    • Pons Respiratory Centers
  43. what are the two parts of the Medullary respiratory centers?
    • 1. Dorsal respiratory group
    • 2. ventral respiratory group
  44. What are the 2 parts of the Pons respiratory centers?
    • 1. Pneumotaxic center
    • 2. Apneustic center
  45. Dorsal respiratory group
    • part of the Medullary respiratory centers
    • integrates signals from peripheral receptors
  46. Ventral respiratory group
    • part of the Medullary respiratory centers
    • rhythm generating and integrative center
  47. Pneumotaxic center
    • part of the Pons respiratory centers
    • modifies action of ventral respiratory group; can slow breathing
  48. Apneustic center
    • Part of the Pons respiratory centers
    • Hypothesized
    • thought to stimulate the pneumotaxic center
  49. Hypercapnia
    • rise in blood CO2
    • low blood CO2
  50. Apnea
    no breathing
  51. Hyperventilation
    • depth and rate of breathing increase
    • slow and shallow breathing
  52. Breathing in birds
    air sacs; air moves from nostrils into posterior air sacs, lungs, anterior air sacs and is then expired. complete cycle takes 2 inhalations/ exhalations.
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ALS 2304 VT Animal Anatomy Final Exam : Respiratory System
2014-12-04 19:09:28
ALS2304 Animal Anatomy Final Exam Respiratory

Respiratory System
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