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Maturation Of The Carotid Body Oxygen-Sensor During Rat Development, Julia Paulet
Maturation Of The Carotid Body Oxygen-Sensor During Rat Development, Julia Paulet
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Carotid bodies (CB) are paired, oxygen-sensing organs located in the bifurcation of the carotid artery that act as peripheral chemoreceptors in the detection of hypoxic, hypercapnic and acidotic levels in the arterial blood. CBs respond to these fluctuations in blood gases by initiating firing of the carotid sinus nerve. This ultimately results in the appropriate ventilatory change to restore blood gases to their physiological levels. Studies have shown that the hypoxic response of the carotid body in juvenile mammals is low, but as maturation occurs this response is strengthened and clearly exhibited in adults. One theory suggests mitochondria play a …
Electrical Brain Stimulation And Depressive-Like Behavior In Guinea Pigs, Nadia Kardegar
Electrical Brain Stimulation And Depressive-Like Behavior In Guinea Pigs, Nadia Kardegar
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Maternal separation in guinea pigs produces a biphasic response consisting of an active behavior phase (vocalizations and locomotor activity) followed by a phase of passive depressive-like behavior (crouched stance, piloerection, and eye closure). The mechanism for the transition from the active to the passive phase is unknown. One suggestion is that continual activity of neural circuitry producing active behavior eventually leads to the expression of passive behaviors. The purpose of this study was to test this possibility. Guinea pigs were assigned to experimental and control groups. The experimental group received daily stimulation of the bed nucleus stria terminalis (BNST) to …