#Question id: 10985
#Physiology
What is the membrane potential (threshold level) at which the S-A node discharges?
#Question id: 10986
#Physiology
Which of the following conditions at the A-V node will cause a decrease in heart rate?
#Question id: 10877
#Physiology
A 27-year-old man is breathing quietly. He then inhales as much air as possible and exhales as much air as he can, producing the spirogram shown in the previous figure. What is his expiratory reserve volume (in liters)?
#Question id: 11059
#Physiology
A healthy, 45-year-old man is reading the newspaper. Which of the following muscles are used for quiet breathing?
#Question id: 11060
#Physiology
A healthy, 25-year-old medical student participates in a 10-km charity run for the American Heart Association. Which of the following muscles does the student use (contract) during expiration?
#Question id: 11061
#Physiology
The pleural pressure of a normal 56-year-old woman is approximately −5 cm H2O during resting conditions immediately before inspiration (i.e., at functional residual capacity). What is the pleural pressure (in cm H2O) during inspiration?