Deck 50: Control of Ventilation

Question 1

Voluntary control of breathing originates in the

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

Answer 1

B

Question 2

T ra ns ec tion of t he sp ina l co rd ca ud al to the po ntin e re sp ira tor y gro up sh ou ld

A) Make respiration deeper because the PRG shuts off inspiration
B) Make respiration deeper because the PRG turns on inspiration
C) M ak e re sp ira tion m or e s ha llow be ca us e th e P R G sh uts off ins pir ato in
D) Make respiration more shallow because the PRG turns on inspiration
E) Have no effect on the depth of inspiration

Answer 2

A

Question 3

The do rs al re sp ira tor y gro up m ain ly

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

Answer 3

A

Question 4

The DRG and VRG are both located in the

A) Cerebellum
B) Pons
C) M ed ulla
D) Tectum
E) Hypothalamus

Question 5

The peripheral chemoreceptors for respiration

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

Question 6

Hypoxia is impo rtant for ventilatory drive

A) All th e tim e
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

Question 7

The m ajor chem oreceptor for P aO₂ is in the

A) M ed ulla
B) Carotid bodies
C) R igh t atr ia
D) Kidney
E) Br ain

Question 8

The ce ntral c hem orec epto rs re spo nd to

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 9

In m eta bo lic a cid os is

A) Dec rease d pla sm a pH stim ulates ven tilation b y excitin g pe riphe ral che m orec epto rs
B) Decre ased plasm a pH inhibits ventilation by exciting peripheral chem oreceptors
C) Increased plasm a pH s timulates ventilation by exciting peripheral chem oreceptors
D) Increased plasm a pH inhibits ventilation by exciting peripheral chem oreceptors
E) [HCO -] levels are Increased

Question 10

In metabolic alkalosis without respiratory compensation

A) Increa sed plasm a pH redu ces v entilato ry drive from perip hera l chem ose nso rs
B) De cre ase d plas m a [H +] stimulates respiration
C) Decreased plasma pH stimulates respiration
D) The Increased plasma P CO₂ inhibits respiration
E) Decreased plasma P O₂ stimulates respiration

Question 11

Sensory information from the peripheral chemoreceptors travel from the

A) Carotid body over the hypoglossal nerve to the pons
B) Aortic body over the vagus nerve to the pons
C) Ca rotid bo dy o ve r the glo sso ph aryn ge al ne rve to th e m ed ulla
D) C ar otid bo dy o ve r th e v ag us ne rve to th e m ed ulla
E) Carotid body over the glossopharyngeal nerve to the pons

Question 12

Respiratory compensation for metabolic acidosis is incomplete because

A) Reduced PaCO₂ reduces the central chemoreceptor ventilatory drive
B) Reduced PaCO₂ Increases ac id p ro du ctio n b y ce lls
C) If it were complete, there would be no stimulation for Increased ventilation
D) Decreased PaO₂ Increases ven tilatory drive
E) Both A and C are true

Question 13

Involuntary control of breathing originates in the

A) Cerebellum
B) Cerebral cortex
C) Po ns and m ed ulla
D) Spinal cord
E) Ba sa l ga ng lia

Question 14

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

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

Question 15

Which muscle(s) are responsible for quiet inspiration?

A) External intercostal muscles
B) Internal intercostal muscles
C) Rectus abdominus
D) Ste rn oc leid om as toid
E) Diaphragm