BIO 270 HYND EXAM 3 Questions with Answers (All Answers Correct)
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BIO 270 HYND
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BIO 270 HYND
Which of following is true regarding Co2
a. It can bind with hemoglobin
b. it can be found dissolved in our blood
c. 20x more soluble than O2
d. All of above - ️️d. All of above
______________ is the main determinant of # of Hb binding sites - ️️
What component of hemoglobin actually ...
BIO 270 HYND EXAM 3
Which of following is true regarding Co2
a. It can bind with hemoglobin
b. it can be found dissolved in our blood
c. 20x more soluble than O2
d. All of above - ✔️✔️d. All of above
______________ is the main determinant of # of Hb binding sites - ✔️✔️
What component of hemoglobin actually binds the oxygen? - ✔️✔️Fe+
Since the blood goes leaves the lungs with pO2 =100, what does this mean for its
affinity? - ✔️✔️Almost fully saturated (around ~ 97%)
What does the plateau portion of the O2-Hb curve tell you? - ✔️✔️Hb is almost fully
saturated
If there is a drop in O2, they will still be almost completely saturated until 60mmHg when
the graph gets steep
Methods of Gas Transport in the Blood:
O2: 2 steps
Dissolved-1.5%
Bound to Hemoglobin-98.5%
CO2: 3 steps
Dissolved-10%
Bound to Hemoglobin-30%
As Bicarbonate- 60% - ✔️✔️KNOW NUMBERS
_________________ ___________ catalyzes this reaction (H2CO3) in the RBC's -
✔️✔️Carbonic Anhydrase
What law explains why soda goes flat? - ✔️✔️Henry's law
Most of the atmosphere is made up of what gas? - ✔️✔️Nitrogen (79%)
N=600mmHg
O=160mmHg
, Obstructive lung diseases (>/<) 80% - ✔️✔️<80% Difficult to exhale air quickly due to
inc. airway resistance
(T/F) The O2-Hb dissociation curve is static - ✔️✔️False, it is not static
Steep between "20-60"
Flat between "60-100
Restrictive lung diseases (>/<) 80% - ✔️✔️>80% Vital capacity is decreased, airflow
doesn't change ... easy to get large % out in 1 second
What does the P50 value represent? - ✔️✔️The amount O2 pressure where
hemoglobin is 50% saturated
You just got done exercising. How do you expect our curve to shift? - ✔️✔️To right to
unload O2
Is the pressure for Co2 higher in our lungs or air? - ✔️✔️Co2 pressure is higher in
lungs so we can breathe out co2
What are the functions of surfactant? - ✔️✔️Decrease hydrogen binding in water
molecules
Increase compliance
Allows lungs to come back slowly
(recoil is lungs coming back, when lungs are at low volume water attracts each other,
makes it hard to inflate then, surfactant will reduce binding of water)
Recoil depends on 2 factors: - ✔️✔️1) Highly elastic connective tissue in lungs
2) Alveolar surface tension (H mol. like to be close)
Treatment of Asthma
Albuterol: mimics sympathetic signal
Anti-Cholinergics: block parasympathetic signals - ✔️✔️
Muscle activity during ACTIVE expiration - ✔️✔️Contraction of internal intercostals
Contraction of abdominals
-flattened ribs and sternum
Muscle activity during inspiration - ✔️✔️Contraction of external intercostals
Contraction of diaphragm
Boyle's Law: - ✔️✔️pressure exerted by a gas is inversely proportional with the volume
of the container
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