Question 1

Hypoxia is important for ventilatory drive

Accepted Answer

A)  All the time 
B)  Only when PaO2 falls below about 100 mm Hg 
C)  Only when PaO2 falls below about 60 mm Hg 
D)  Only when PaCO2 is above 40 mm Hg 
E)  Only when PaCO2 falls below about 40 mm Hg 
A)  All the time 
B)  Only when PaO2 falls below about 100 mm Hg 
C)  Only when PaO2 falls below about 60 mm Hg 
D)  Only when PaCO2 is above 40 mm Hg 
E)  Only when PaCO2 falls below about 40 mm Hg C

Question 2

Transection of the spinal cord caudal to the pontine respiratory group should

Accepted Answer

A)  Make respiration deeper because the PRG shuts off inspiration 
B)  Make respiration deeper because the PRG turns on inspiration 
C)  Make respiration more shallow because the PRG shuts off inspiratoin 
D)  Make respiration more shallow because the PRG turns on inspiration 
E)  Have no effect on the depth of inspiration 
A)  Make respiration deeper because the PRG shuts off inspiration 
B)  Make respiration deeper because the PRG turns on inspiration 
C)  Make respiration more shallow because the PRG shuts off inspiratoin 
D)  Make respiration more shallow because the PRG turns on inspiration 
E)  Have no effect on the depth of inspiration A

Question 3

Voluntary control of breathing originates in the

Accepted Answer

A)  Cerebellum 
B)  Cerebral cortex 
C)  Medulla and Pons 
D)  Pons 
E)  Spinal reflexes 
A)  Cerebellum 
B)  Cerebral cortex 
C)  Medulla and Pons 
D)  Pons 
E)  Spinal reflexes B

Question 4

The peripheral chemoreceptors for respiration

Accepted Answer

A)  mainly reside in the aortic bodies 
B)  Respond only to PCO2 
C)  Send afferent information over the hypoglossal nerve 
D)  Respond to PO2 only when it falls below about 40-60 mm Hg 
E)  Cause increased ventilation in exercise 
A)  mainly reside in the aortic bodies 
B)  Respond only to PCO2 
C)  Send afferent information over the hypoglossal nerve 
D)  Respond to PO2 only when it falls below about 40-60 mm Hg 
E)  Cause increased ventilation in exercise

Question 5

The DRG and VRG are both located in the

Accepted Answer

A)  Cerebellum 
B)  Pons 
C)  Medulla 
D)  Tectum 
E)  Hypothalamus 
A)  Cerebellum 
B)  Pons 
C)  Medulla 
D)  Tectum 
E)  Hypothalamus

Question 6

The major chem oreceptor for PaO2 is in the

Accepted Answer

A)  Medulla 
B)  Carotid bodies 
C)  Right atria 
D)  Kidney 
E)  Brain 
A)  Medulla 
B)  Carotid bodies 
C)  Right atria 
D)  Kidney 
E)  Brain

Question 7

Inhibition of lung inflation by stretch receptors in the lungs is called the

Accepted Answer

A)  Hering-Breuer inflation reflex 
B)  Jendrassix maneuver 
C)  Bohr effect 
D)  Haldane effect 
E)  Pasteur effect 
A)  Hering-Breuer inflation reflex 
B)  Jendrassix maneuver 
C)  Bohr effect 
D)  Haldane effect 
E)  Pasteur effect

Question 8

Involuntary control of breathing originates in the

Accepted Answer

A)  Cerebellum 
B)  Cerebral cortex 
C)  Pons and medulla 
D)  Spinal cord 
E)  Basal ganglia 
A)  Cerebellum 
B)  Cerebral cortex 
C)  Pons and medulla 
D)  Spinal cord 
E)  Basal ganglia

Question 9

Sensory information from the peripheral chemoreceptors travel from the

Accepted Answer

A)  Carotid body over the hypoglossal nerve to the pons 
B)  Aortic body over the vagus nerve to the pons 
C)  Carotid body over the glossopharyngeal nerve to the medulla 
D)  Carotid body over the vagus nerve to the m edulla 
E)  Carotid body over the glossopharyngeal nerve to the pons 
A)  Carotid body over the hypoglossal nerve to the pons 
B)  Aortic body over the vagus nerve to the pons 
C)  Carotid body over the glossopharyngeal nerve to the medulla 
D)  Carotid body over the vagus nerve to the m edulla 
E)  Carotid body over the glossopharyngeal nerve to the pons

Question 10

In metabolic alkalosis without respiratory compensation

Accepted Answer

A)  Increased plasm a pH reduces ventilatory drive from peripheral chem osensors 
B)  Decreased plasma [H+] stimulates respiration 
C)  Decreased plasma pH stimulates respiration 
D)  The increased plasma PCO2 inhibits respiration 
E)  Decreased plasma PO2 stimulates respiration 
A)  Increased plasm a pH reduces ventilatory drive from peripheral chem osensors 
B)  Decreased plasma [H+] stimulates respiration 
C)  Decreased plasma pH stimulates respiration 
D)  The increased plasma PCO2 inhibits respiration 
E)  Decreased plasma PO2 stimulates respiration

Question 11

The dorsal respiratory group mainly

Accepted Answer

A)  Excites inspiratory motor neurons 
B)  Inhibits inspiratory motor neurons 
C)  Excites expiratory motor neurons 
D)  Inhibits expiratory motor neurons 
E)  Originates sensory information 
A)  Excites inspiratory motor neurons 
B)  Inhibits inspiratory motor neurons 
C)  Excites expiratory motor neurons 
D)  Inhibits expiratory motor neurons 
E)  Originates sensory information

Question 12

The central chem oreceptors respond to

Accepted Answer

A)  PCO2 in the CSF 
B)  PO2 in the CSF 
C)  pH in the CSF 
D)  Temperature of the CSF 
E)  Both A and C 
A)  PCO2 in the CSF 
B)  PO2 in the CSF 
C)  pH in the CSF 
D)  Temperature of the CSF 
E)  Both A and C

Question 13

In metabolic acidosis

Accepted Answer

A)  Decreased plasma pH stimulates ventilation by exciting peripheral chemoreceptors 
B)  Decreased plasm a pH inhibits ventilation by exciting peripheral chem oreceptors 
C)  Increased plasma pH stimulates ventilation by exciting peripheral chemoreceptors 
D)  Increased plasma pH inhibits ventilation by exciting peripheral chem oreceptors 
E)  [HCO3-] levels are increased 
A)  Decreased plasma pH stimulates ventilation by exciting peripheral chemoreceptors 
B)  Decreased plasm a pH inhibits ventilation by exciting peripheral chem oreceptors 
C)  Increased plasma pH stimulates ventilation by exciting peripheral chemoreceptors 
D)  Increased plasma pH inhibits ventilation by exciting peripheral chem oreceptors 
E)  [HCO3-] levels are increased

Question 14

Respiratory compensation for metabolic acidosis is incomplete because

Accepted Answer

A)  Reduced PaCO2 reduces the central chemoreceptorventilatory drive 
B)  Reduced PaCO2 increases acid production by cells 
C)  If it were complete, there would be no stimulation for increased ventilation 
D)  Decreased PaO2 increases ventilatory drive 
E)  Both A and C are true 
A)  Reduced PaCO2 reduces the central chemoreceptorventilatory drive 
B)  Reduced PaCO2 increases acid production by cells 
C)  If it were complete, there would be no stimulation for increased ventilation 
D)  Decreased PaO2 increases ventilatory drive 
E)  Both A and C are true

Question 15

W hich muscle(s) are responsible for quiet inspiration?

Accepted Answer

A)  External intercostal muscles 
B)  Internal intercostal muscles 
C)  Rectus abdominus 
D)  Sternocleidom astoid 
E)  Diaphragm 
A)  External intercostal muscles 
B)  Internal intercostal muscles 
C)  Rectus abdominus 
D)  Sternocleidom astoid 
E)  Diaphragm

Exam 50: Control of Ventilation

Hypoxia is important for ventilatory drive

Transection of the spinal cord caudal to the pontine respiratory group should

Voluntary control of breathing originates in the

The peripheral chemoreceptors for respiration

The DRG and VRG are both located in the

The major chem oreceptor for PaO2 is in the

Inhibition of lung inflation by stretch receptors in the lungs is called the

Involuntary control of breathing originates in the

Sensory information from the peripheral chemoreceptors travel from the

In metabolic alkalosis without respiratory compensation

The dorsal respiratory group mainly

The central chem oreceptors respond to

In metabolic acidosis

Respiratory compensation for metabolic acidosis is incomplete because

W hich muscle(s) are responsible for quiet inspiration?

Physical Foundations Ii: Electrical Force Potential Capacitance and Current

Chemical Foundations I: Chemical Energy and Intermolecular Forces

Chemical Foundations Ii: Concentration and Kinetics

Diffusion

Electrochemical Potential and Free Energy

Cell Structure

Dna and Protein Synthesis

Protein Structure

Biological Membranes

Passive Transport and Facilitated Diffusion

Active Transport: Pumps and Exchangers

Osmosis and Osmotic Pressure

Cell Signaling

ATP Production I: Glycolysis

Atp Production Ii: Tca Cycle and Oxidative Phosphorylation

Atp Production Iii: Fatty Acid Oxidation and Amino Acid Oxidation

Origin of the Membrane Potential

The Action Potential

Propagation of the Action Potential

Skeletal Muscle Mechanics

Contractile Mechanisms in Skeletal Muscle

Neuromuscular Junction and Ec Coupling

Muscle Energetics Fatigue and Training

Smooth Muscle

Organization of the Nervous System

Cells Synapses and Neurotransmitters

Cutaneous Sensory Systems

Spinal Reflexes

Balance and Control of Movement

the Chemical Senses

Hearing

Vision

Autonomic Nervous System

Overview of the Cv System and Blood

Plasma and Red Blood Cells

White Blood Cells and Inflammation

The Heart As a Pump

Cellular Basis of Cardiac Contractility

the Cardiac Function Curve

Vascular Function: Hemodynamics

Microcirculation and Solute Exchange

Regulation of Perfusion

Integration of Cardiac Output and Venous Return

Regulation of Arterial Pressure

Mechanics of Breathing

Lung Volumes and Airway Resistance

Gas Exchange in the Lung

Oxygen and Carbon Dioxide Transport

Acid Base Physiology I Bicarbonate Buffers and Respiratory Compensation

Anatomy and Renal Overview

Glomerular Filtration

Tubular Reabsorption and Secretion

Concentration and Dilution of Urine

Mouth and Esophagus

The Stomach

Intestinal and Colonic Motility

Pancreatic and Biliary Secretion

Digestion and Absorption of the Macronutrients

Energy Balance and Regulation of Food Intake

General Principles of Endocrinology

Hypothalamus and Pituitary Gland

The Thyroid Gland

The Endocrine Pancreas

The Adrenal Cortex

The major chem oreceptor for P_aO2 is in the