Breathe Flashcards
Atmospheric Partial Pressures
PO2: 159mmHg
PCO2: 0.3mmHg
Alveolar Partial Pressures
PO2: 105mmHg
PC02: 40mmHg
Most Abundant Gas
Nitrogen
Gas Mass
760
Each inhalation/exhalation in Milliliters
500ml
Tidal Volume
One breath
% of volume involved in gas exchange
70%
% of Anatomical Dead Space
30%
Eupnea
Normal quiet breathing
Costal Breathing is
shallow
Diaphragmic Breathing is
Deep
Costal breathing movement
upward and outward movement of chest
Diaphragmic breathing movement
Outward movement of abdomen
External Respiration is
pulmonic gas exchange
External respiration involves
alveoli and pulmonary capillaries
Internal Respiration movement
Outward movement
Internal Respiration involves
02 and CO2 exchange in capillaries and tissue
P02 in Systemic Capillaries
100mmHg
PO2 in tissue
40mmHg
Partial Pressure of Oxygenated Blood
PO2: 100mmHg
PC02: 40mHg
Partial Pressure Deoxygenated Blood
PO2: 40mmHg
CO2: 45mmHg
Muscles of quiet exhalation (passive)
Diaphragm and external intercostal
Muscles of forced exhalation
Internal Intercostal
External Oblique
Internal Oblique
Transverse Abdomen
Rectal Abdomen
O2 and CO2 transfer by
Passive diffusion
3 factors of oxygen transport
CAT
Carbon dioxide, acidity, temperature
Atmospheric Pressure is Higher than…
alveolar
Lung Volume decreases, alveolar pressure…
increases and passive diffusion occurs
Carbon Dioxide Transport 3 main forms
7% of CO2 dissolves into plasma
23% is bound to amino acids (hemoglobin)
greatest percentage of CO2 is bicarb at 70%
HCO3
Bicarbonate ions
Rest Pressure : alveolar and intrapleural
alveolar 760mmHg
intrapleural 756mmHg
Resting pressure is equal to
Atmospheric pressure
Inhalation Pressure vs Atmospheric Pressure
Below atmospheric
Exhalation Pressure vs Atmospheric Pressure
Above Atmosphere
Oblique Fissure
divides left lung into 2 lobes and right lung into 3
Microscopic Airway Path
Terminal bronchioles
Respiratory bronchioles
Alveolar Ducts
Alveolar Sacs
Alveoli
Branching of Bronchial Tree
Trachea
Main Bronchi
Lobar Bronchi
Segmental Bronchi
Bronchioles
Terminal Bronchioles
Muscles of Quiet Inhalation
Diaphragm (75% of air entering lungs)
External Intercostal
Thoracic Floor
Deep breath muscles
Sternocleidomastoid
Scalene
Pectoralis Minor
3 Bronchi aka Bronchial Tree
Primary: Main
Secondary: Lobar
Tertiary: Segmental
Inhaled particles are removed by
Macrophages
4 layers of lungs
Pleural Membrane
Parietal Pleura
Pleural Cavity
Visceral Pleura
Pleural Membrane
Prötec
Parietal Pleura
Attaches to diaphragm and thorax
Visceral Pleura
Attached to lungs
Pleural Cavity
lubricating fluid
L vs R Lung size difference
L is 10% smöller
Fissures
deep grooves that divide lungs into lobes
Conducting Zone
Connecting cavities outside and within the lungs that filter, warm and moisten air
Respiratory Zone
Consists of tissue within lungs where gas exchange occurs
Conducting Zone Anatomy
Nose
Nasal Cavity
Pharynx
Larynx
Trachea
Bronchi
Terminal Bronchioles
Respiratory Zone Anatomy
Respiratory Bronchioles
Alveolar Ducts
Alveolar Sac
Alveoli
exchanges small amounts of air with auditory tubes to equalize pressure between middle ear and atmosphere
Nasopharynx
Two tonsil pairs
palatine and lingual
Greater air pressure equals
greater sound
Pitch is controlled by
vocal folds
Trachea has how many rings
16-20 c-shaped rings
Respiratory Control Center
pons and medulla
Controls basic rhythm of respiration
Medulla Oblongata
Generates nerve impulses that establish basic rhythm of normal quiet breathing
Dorsal Respiratory Group
Phrenic Nerve
innervates the diaphragm
Ventral Respiratory Group
nerve impulses for forceful breathing
Cortical influence on Respiration
cerebral cortex allows for voluntary breath hold
Allows Emotional stimuli to alter respirations (2)
Hypothalamus and Limbic System
Central Chemoreceptors Location
medulla
Peripheral Chemoreceptors Location
aortic arch
Chemoreceptors are what type of feedback system?
Negative
Hypercapnia
Increase in arterial PCO2 above 40mmHg; peripheral chemoreceptors will respond
Hypoxia
O2 deficiency below 50mmHg; chemoreceptors are simulated
Hypocapnia
arterial PCO2 falls below 40mmHg; no chemoreceptors stimulated.
Second rib reference point
Angle of Louis
Angle of Louis aka
manubriosternal junction
Costal Angle
90 degrees with ribs inserted at 45 degrees
Vertebra Prominence
C7, seen and palpated with head bent forward.
If two are felt the lower is T1.
Landmarks of the center of the chest (descending)
Suprasternal notch
Manubrium
Angle of Louis
Sternum
Xiphoid Process
Pregnancy respiration rate and rhythm; is; influenced by what hormone
-pregnant women have deeper and increased respirations
-influenced by excess estrogen
Variation with Age
-alveoli are less elastic and more fibrous
-mucous membranes become more dry
-decreased vital capacity
Barrel Chest
results from loss of muscle strength in the thorax and diaphragm; chest wall may stiffen, and expansion is decreased.