BIOC34H3 Lecture Notes - Hyperventilation, Brainstem, Snoring

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Published on 25 Jun 2012
School
UTSC
Department
Biological Sciences
Course
BIOC34H3
Professor
BGYC33/CC4 Respiratory System Study Guide, Lectures 13-15 (2011)
Lecture 13: Blood Gases, Ventilation-Perfusion Matching and the Control of
Breathing
Topics
Oxygen-Haemoglobin Binding
The Oxygen Equilibrium (Dissociation) Curve
Carbon Monoxide
Ventilation (V) – Perfusion (Q) Matching
V-Q Ratios with an Obstructed Airway
V-Q Ratios with Obstructed Capillaries
Regional Differences in Airflow and Blood Flow
The Bottom of the Lung
The Middle of the Lung
The Top of the Lung
Control of Breathing
General Scheme of Respiratory Control
The Central Control of Breathing
Eupnea, Apneusis, Gasping and Apnea
The Pontine Respiratory Group
The Dorsal Respiratory Group (Nucleus of the Solitary Tract; NTS)
The Ventral Respiratory Group
Thetzinger Complex
The Nucleus Ambiguous
The Nucleus Retroambiguous
The Pre-Bötzinger Complex
Respiratory Rhythm Generation
Sample Questions
1) Which of the following statement regarding physiologic shunt is not correct?
a) It is more likely to occur at the bottom of the lung rather than at the top of the lung.
b) Blood is flowing but it is not oxygenated.
c) It occurs when V/Q is greater than 1
d) It can occur when alveoli are destroyed by cigarette smoke.
e) It can occur when alveoli are destroyed by asbestos.
2) Which of the following conditions would not lead to gasping?
a) Anoxia
b) Severe hypoxia
c) Cerebral Ischemia
d) A transection at the border of the pons and medulla
e) A transection at the border of the medulla and spinal cord
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3) Destruction of the nucleus of the solitary tract might be expected to cause which of the following
changes in cardiorespiratory parameters/function?
a) An increase in blood pressure.
b) An decrease in blood pressure.
c) An increase in arterial pO2.
d) Apnea.
e) Two of the above.
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