circulatory and respiration - mt. san antonio...
TRANSCRIPT
Circulatory And Respiration
CompositionOf
Blood
Blood
Heart
Heart
Aorta
Artery
Arteriole
Capillary Bed
Venule
Vein
Vena Cava
200mmHg
120mmHg
50mmHg
Differences Between Arteries and Veins
• Veins transport blood away from the heart
• Veins are low pressure vessels• Veins have valves
Arteries and Veins
Coronary artery
Plaque
Arteriosclerosis
HDL’s: Carry cholesterol away from cell to liver
LDL’s: Carry cholesterol to tissues including coronary artery
High blood pressure can rupture blood vessels in the brain causing a hemorrhagic stroke.
Normal Blood Pressure• Systolic Pressure
– Maximum pressure during ventricular contraction
• Diastolic Pressure– Minimum pressure during ventricular
relaxation
• Textbook Values: SP 120 mmHgDP 80 mmHg
Ruptured blood vesselsin the retina associated with hypertension
Hypertension = High Blood Pressure
The Sinoatrial Node
The Cardiac Cycle
Atrial emptying Ventricular Ventricular fillingemptying
The Respiratory System
C6H12O6 + 6O2 6CO2 + 6H2O + ATP (Energy)
The Equation for Cellular Respiration
The Respiratory SystemCommon passageway forfood and air
Food transport tube
Voice boxWind pipe
Functional part of lungSite of gas exchange
Prevents food fromentering air passageways
Transports air to right andleft lung
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AnatomicalDead Space
Anatomical Dead Space Holds 150 ml air
Alveoli: The site of gasexchange
Daltons Law• The total pressure exerted by a gas mixture is
equal to the sum of the individual pressures (partial pressures) of each of the different gases in the mixture.
• Atmospheric Pressure (pATM) = 760 mm Hg at sea level
• Note: Atmospheric Pressure can be referred to as Barometric Pressure
Dalton’s Law
• pAtm at sea level = _________• Air
– 78 % N2
– 21 % O2
• pO2 = (Percent O2 in air) X (pAtm)
760 mm Hg
pO2 = ______ X _____ = _______.21 760mmHg 158 mm Hg
An increase in elevation results in a decrease in atmospheric (barometric) pressure.Mount Everest: 29,142 feetpAtm = 245 mm Hg pO2 = .21 X 245 mmHg = 51mm Hg
View Of Whitney: 14,495 feet; pAtm = 400 mm Hg
Mount Whitney
pO2 = _____ X _____ = _____.21 400 84 mm Hg
Mt. Everest: 29,142 ft.pAtm = 245 mm Hg
Effects of Elevation
Mt. Whitney14,495 ft.
pO2 at the top of Mt. Everest
pO2 = .21 X 245 = 51mm Hg
What will happen to the size of this balloon if you carry it from sea level up a mountain?
What happens to the distance between oxygenmolecules as you carrythe balloon up a mountain?
pATM is _____________Molecules are __________
Sea Level versus the Top of Mount Everest
Mount Everest
Sea Level
pAtm is ______________________Molecules are _________________
higher than Everestcloser together
much lower than sea levelfurther apart
Hypoxia = Low Blood Oxygen
Humans experiencehypoxia at highelevation
The top ofRed SlateMountain
pO2 = 100mmHg
pCO2 = 40mmHgpO2 = 40mmHg
pCO2 = 45mmHg
pO2 in tissues is 40mmHg
pCO2 in tissues is 45mmHg
GasDiffusion
Blood enteringalveolar capillaries
Blood leaving alveolar capillaries
97
--------------------75 Oxygen – HemoglobinDissociation Curve
What happens to theSaturation of Hemoglobin whenpO2 increases?
What happens to pO2 aselevation increases?
Factors that affect the partial pressure of oxygen
What happens to bodythe saturation ofhemoglobin when bodytemperature rises?
---- Normal body temperature
Factors that affect the saturation of hemoglobin
Boyles Law• A: Normal volume and pressure• B: Volume is decreased resulting in
increased pressure• C: Volume is increased resulting in
decreased pressure
Rib cage expandswhen external
intercostals contract
Rib cage gets smallerwhen external intercostals relax
Ventilation of the Lungs
Ventilation: Moving Air in andOut of Lungs
Contract external intercostals Contract Diaphragm
_______ Volume of Thoracic Cavity
_______ Pressure of Thoracic cavity
pAtm is greater than air pressure in thoracic cavity
AIR MOVES IN (INHALATION)
Respiratory Rate and Tidal Volume
• Respiratory rate = Number of breaths you take per minute
– Textbook value = 12 breaths per minute
• Tidal Volume– Volume of air inhaled or exhaled during normal breathing– The volume of air inhaled or exhaled in a normal resting breath
– Textbook value = 500 ml per breath
Pulmonary Ventilation (PV)
• Pulmonary Ventilation (PV)– The volume of air that moves in out of the
lungs in one minute
– PV = Respiratory Rate X Respiratory Volume
– Resting PV = Respiratory Rate X Tidal Volume= ____________ X __________= ___________________
12 breaths/min 500 ml /breath6,000 ml/min
Regulation of Respiratory Rate
• The primary factor that controls respiratory rate is the amount of CO2 in the blood.– Increased CO2 causes a/an ___ in respiratory rate– Decreased CO2 causes a/an ___in respiratory rate– Hyperventilation _____ blood CO2 levels– Holding your breath ____ blood CO2 levels
• An increase in blood CO2 has what effect on blood pH?
Regulation of Respiratory Rate
CO2 + H2O H2CO3 H+ + HCO3-