BP Regulation Flashcards
Which nucleus receives sensory input from baroreceptors?
Nucleus Tractus Solitarius (NTS)
What is the role of NTS in blood pressure regulation?
Processes sensory input and modulates autonomic responses to regulate BP
How does NTS lower blood pressure through RVLM?
NTS stimulates CVLM, which inhibits RVLM, reducing sympathetic output
What effect does inhibiting RVLM have on blood vessels?
Vasodilation, leading to decreased blood pressure
How does NTS influence DVN?
NTS directly stimulates DVN, increasing parasympathetic output
Which neurotransmitter is primarily released by the DVN?
Acetylcholine (ACh)
What is the role of CVLM in blood pressure regulation?
Inhibits RVLM to reduce sympathetic tone and lower BP
What happens when RVLM is inhibited?
Sympathetic outflow decreases, reducing heart rate and vasoconstriction
How does the body respond to low blood pressure via RVLM?
NTS reduces CVLM activity, allowing RVLM to increase sympathetic tone
Which nucleus is responsible for cardioinhibitory actions?
Dorsal Vagal Nucleus (DVN)
How does the vagus nerve contribute to lowering heart rate?
Carries parasympathetic fibers from DVN to the heart
Which of the following nuclei is responsible for increasing sympathetic tone?
RVLM
What happens to RVLM activity when baroreceptors detect high BP?
It is inhibited via CVLM stimulation
Which nucleus is stimulated to increase parasympathetic output when BP is high?
DVN
Which structure processes baroreceptor signals before relaying autonomic responses?
Nucleus Tractus Solitarius (NTS)
Which of the following pathways correctly describes the response to high BP?
NTS → CVLM → Inhibits RVLM → Decreased sympathetic output
Which neurotransmitter is involved in parasympathetic action from DVN?
Acetylcholine (ACh)
What happens when the CVLM is inhibited?
RVLM activity increases, leading to higher sympathetic output
In response to low BP, which nucleus is inhibited to increase CO and vasoconstriction?
CVLM
Which of the following is a primary function of the RVLM?
Maintaining baseline sympathetic tone
