Effect of temperature on the pattern of lung ventilation and on the ventilation-circulation relationship in the turtle, Pseudemys scripta

Cardiovascular responses to diving in the turtle, Pseudemys scripta

“…The increase in heart rate observed during active lung ventilation in the turtles of this study has been observed previously (Johansen et al, 1977;Lucey and House, 1977). This tachycardia is associated with an in creased blood flow to the lungs (Shelton and Burggren, 1975;Johansen et al, 1977) and may provide a more efficient ventilation/perfusion relation ship.…”

“…This tachycardia is associated with an in creased blood flow to the lungs (Shelton and Burggren, 1975;Johansen et al, 1977) and may provide a more efficient ventilation/perfusion relation ship. The lower heart rates during apnea may be vagally induced (Burggren, 1975) and the tachycardia accompanying ventilation may be mediated by stretch receptors within the pulmonary system or may be due to inhibition of the cardio-inhibitory center by the active respiratory center (Burggren, 1975;Lucey and House, 1977). This reduction in heart rate during apnea may be related to the bradycardia and vasoconstriction of diving (Angell- James and Daly, 1969a).…”

“…The increased pulmonary vascular resistance causes a partial pulmonary bypass due to development of a R-L shunt. Ross (1965), Bel kin (1959), Burggren (1975), Johansen et al (1977) and Lucey and House (1977) have found that turtles have a higher heart rate during active ventilation than during apneic periods. This is associated with an increased blood flow to the lungs (White and Ross, 1966;Shelton and Burggren, 1976;Johansen et al, 1977).…”

“…However, Burggren (1975) found that artificial lung infla tion with various gas mixtures did not alter the heart rate in turtles. Lucey and House (1977) and Burggren (1975) suggest that the responses noted are probably due to inhibition of the cardio-inhibitory center and with each other in mammals. Lucey and House (1977) also observed a slight rise in systemic systolic and diastolic pressures in the turtle during active ventilation at 25 and 30°C.…”

Cardiovascular responses to diving in the turtle, Pseudemys scripta

“…The increase in heart rate observed during active lung ventilation in the turtles of this study has been observed previously (Johansen et al, 1977;Lucey and House, 1977). This tachycardia is associated with an in creased blood flow to the lungs (Shelton and Burggren, 1975;Johansen et al, 1977) and may provide a more efficient ventilation/perfusion relation ship.…”

“…This tachycardia is associated with an in creased blood flow to the lungs (Shelton and Burggren, 1975;Johansen et al, 1977) and may provide a more efficient ventilation/perfusion relation ship. The lower heart rates during apnea may be vagally induced (Burggren, 1975) and the tachycardia accompanying ventilation may be mediated by stretch receptors within the pulmonary system or may be due to inhibition of the cardio-inhibitory center by the active respiratory center (Burggren, 1975;Lucey and House, 1977). This reduction in heart rate during apnea may be related to the bradycardia and vasoconstriction of diving (Angell- James and Daly, 1969a).…”

“…The increased pulmonary vascular resistance causes a partial pulmonary bypass due to development of a R-L shunt. Ross (1965), Bel kin (1959), Burggren (1975), Johansen et al (1977) and Lucey and House (1977) have found that turtles have a higher heart rate during active ventilation than during apneic periods. This is associated with an increased blood flow to the lungs (White and Ross, 1966;Shelton and Burggren, 1976;Johansen et al, 1977).…”

“…However, Burggren (1975) found that artificial lung infla tion with various gas mixtures did not alter the heart rate in turtles. Lucey and House (1977) and Burggren (1975) suggest that the responses noted are probably due to inhibition of the cardio-inhibitory center and with each other in mammals. Lucey and House (1977) also observed a slight rise in systemic systolic and diastolic pressures in the turtle during active ventilation at 25 and 30°C.…”

Cardiovascular responses to diving in the turtle, Pseudemys scripta

“…It should also be noted that Lucey and House (1977) 4 u'sc iif'non T no nnnv Tpmnpr*^ -tare was decreased to 1G°C.…”

Cardiovascular responses to diving in the turtle, Pseudemys scripta

“…The increase in heart rate observed during active lung ventilation in the turtles of this study has been observed previously (Johansen et al, 1977;Lucey and House, 1977). This tachycardia is associated with an in creased blood flow to the lungs (Shelton and Burggren, 1975;Johansen et al, 1977) and may provide a more efficient ventilation/perfusion relation ship.…”

“…This tachycardia is associated with an in creased blood flow to the lungs (Shelton and Burggren, 1975;Johansen et al, 1977) and may provide a more efficient ventilation/perfusion relation ship. The lower heart rates during apnea may be vagally induced (Burggren, 1975) and the tachycardia accompanying ventilation may be mediated by stretch receptors within the pulmonary system or may be due to inhibition of the cardio-inhibitory center by the active respiratory center (Burggren, 1975;Lucey and House, 1977). This reduction in heart rate during apnea may be related to the bradycardia and vasoconstriction of diving (Angell- James and Daly, 1969a).…”

“…The increased pulmonary vascular resistance causes a partial pulmonary bypass due to development of a R-L shunt. Ross (1965), Bel kin (1959), Burggren (1975), Johansen et al (1977) and Lucey and House (1977) have found that turtles have a higher heart rate during active ventilation than during apneic periods. This is associated with an increased blood flow to the lungs (White and Ross, 1966;Shelton and Burggren, 1976;Johansen et al, 1977).…”

“…However, Burggren (1975) found that artificial lung infla tion with various gas mixtures did not alter the heart rate in turtles. Lucey and House (1977) and Burggren (1975) suggest that the responses noted are probably due to inhibition of the cardio-inhibitory center and with each other in mammals. Lucey and House (1977) also observed a slight rise in systemic systolic and diastolic pressures in the turtle during active ventilation at 25 and 30°C.…”

Cardiovascular responses to diving in the turtle, Pseudemys scripta

“…It should also be noted that Lucey and House (1977) 4 u'sc iif'non T no nnnv Tpmnpr*^ -tare was decreased to 1G°C.…”

Cardiovascular responses to diving in the turtle, Pseudemys scripta

“…The increase in heart rate observed during active lung ventilation in the turtles of this study has been observed previously (Johansen et al, 1977;Lucey and House, 1977). This tachycardia is associated with an in creased blood flow to the lungs (Shelton and Burggren, 1975;Johansen et al, 1977) and may provide a more efficient ventilation/perfusion relation ship.…”

“…This tachycardia is associated with an in creased blood flow to the lungs (Shelton and Burggren, 1975;Johansen et al, 1977) and may provide a more efficient ventilation/perfusion relation ship. The lower heart rates during apnea may be vagally induced (Burggren, 1975) and the tachycardia accompanying ventilation may be mediated by stretch receptors within the pulmonary system or may be due to inhibition of the cardio-inhibitory center by the active respiratory center (Burggren, 1975;Lucey and House, 1977). This reduction in heart rate during apnea may be related to the bradycardia and vasoconstriction of diving (Angell- James and Daly, 1969a).…”

“…The increased pulmonary vascular resistance causes a partial pulmonary bypass due to development of a R-L shunt. Ross (1965), Bel kin (1959), Burggren (1975), Johansen et al (1977) and Lucey and House (1977) have found that turtles have a higher heart rate during active ventilation than during apneic periods. This is associated with an increased blood flow to the lungs (White and Ross, 1966;Shelton and Burggren, 1976;Johansen et al, 1977).…”

“…However, Burggren (1975) found that artificial lung infla tion with various gas mixtures did not alter the heart rate in turtles. Lucey and House (1977) and Burggren (1975) suggest that the responses noted are probably due to inhibition of the cardio-inhibitory center and with each other in mammals. Lucey and House (1977) also observed a slight rise in systemic systolic and diastolic pressures in the turtle during active ventilation at 25 and 30°C.…”

Cardiovascular responses to diving in the turtle, Pseudemys scripta

“…It should also be noted that Lucey and House (1977) 4 u'sc iif'non T no nnnv Tpmnpr*^ -tare was decreased to 1G°C.…”