Knowledge Tree
baroreflex
Also known as: baroreflex, baroreceptor reflex
Facts (11)
Sources
Homeostasis: The Underappreciated and Far Too Often ... - Frontiers frontiersin.org 7 facts
referenceRaven et al. (2006) demonstrated that physiological adjustments during exercise result from shifting the baroreceptor reflex to a higher operating point, effectively altering the range of homeostatic regulation, rather than inhibiting the reflex.
claimThe baroreceptor reflex maintains blood pressure by increasing parasympathetic activity and decreasing sympathetic activity when blood pressure increases, thereby reducing cardiac output and total peripheral resistance (TPR), with the opposite occurring when blood pressure decreases.
claimThe baroreceptor reflex functions as a 'barostat,' which is a biological mechanism analogous to a thermostat used for regulating room temperature.
claimSubconscious homeostatic control is exemplified by adjustments in blood pressure regulation during exercise, specifically a shift in the operating point of the baroreceptor reflex so that both heart rate and stroke volume increase despite increases in blood pressure compared to resting conditions, as cited in Raven et al. (2006).
claimDuring exercise, heart rate and blood pressure are simultaneously elevated, which demonstrates that baroreceptor reflex regulation is altered to increase oxygen delivery to meet the metabolic demands of exercising muscles.
referenceHomeostatic control is organized as a hierarchical, multi-level, multi-goal seeking system consisting of three levels: physiochemical processes (first level), autonomous self-regulation such as the baroreceptor reflex (second level), and central command and control centers in the central nervous system (third level).
referenceThe cardiorespiratory response to exercise demonstrates hierarchical control of homeostatic regulation: the first level consists of tissues and organs of the cardiovascular and respiratory systems (heart, lung, blood vessels, kidneys, and endocrine glands); the second level consists of the baroreceptor and cardiorenal reflexes; and the third level of regulation occurs within the medulla (NTS) of the central nervous system where sensory information is processed and efferent responses are initiated.
Extent and Health Consequences of Chronic Sleep Loss and ... - NCBI ncbi.nlm.nih.gov 2 facts
claimPatients with impaired baroreflexes, such as those with hypertension, heart failure, or premature infants, are susceptible to excessive autonomic responses to chemoreflex stimulation during apnea, which can lead to bradyarrhythmias, hypoxia, hypoperfusion, and sympathetic activation, potentially predisposing them to sudden death.
claimIn patients with impaired baroreflexes, bradyarrhythmias, hypoxia, hypoperfusion, and sympathetic activation during apnea may predispose the individual to sudden death, according to Somers et al. (1988; 1992).
Homeostasis and the Autonomic Nervous System thedysautonomiaproject.org Nov 27, 2022 1 fact
claimMechanical distortion of the carotid sinus triggers the baroreflex, causing an increase in vagal outflow, a decrease in sympathetic outflow, and a subsequent drop in blood pressure that leads to a loss of consciousness.
Sex differences in cardiorespiratory control under hypoxia - Frontiers frontiersin.org Jan 30, 2025 1 fact
referenceHalliwill, Morgan, and Charkoudian investigated peripheral chemoreflex and baroreflex interactions in cardiovascular regulation in humans in a 2003 study published in The Journal of Physiology.