QuestionSBA
QuestionChoice
This is incorrect. Whilst the caudal ventrolateral medulla is involved in the baroreceptor reflex pathway, it is not the site where afferent fibres from the carotid sinus first arrive as that is the nucleus tractus solitatius. Instead, it receives electrical activity from the nucleus tractus solitarius to, along with the rostral ventrolateral medulla, increase sympathetic activity to the heart and blood vessels.
10026343
d
Caudal ventrolateral medulla
QuestionChoice
This is incorrect. Whilst the nucleus ambiguus is involved in the baroreceptor reflex pathway, it is not the site where afferent fibres from the carotid sinus first arrive as that is the nucleus tractus solitatius. Instead, it receives electrical activity from the nucleus tractus solitarius to raise the heart rate.
10026341
b
Nucleus ambiguus
QuestionChoice
This is correct. Baroreceptor afferent fibres are sent to the nucleus tractus solitarius. This then sends further impulses to other areas of the brain, such as the nucleus ambiguus, rostral ventrolateral medulla, caudal ventrolateral medulla, and paraventricular nucleus which bring about the reflex actions.
10026340
a
Nucleus tractus solitarius
QuestionChoice
This is incorrect. Whilst the rostral ventrolateral medulla is involved in the baroreceptor reflex pathway, it is not the site where afferent fibres from the carotid sinus first arrive as that is the nucleus tractus solitatius. Instead, it receives electrical activity from the nucleus tractus solitarius to, along with the caudal ventrolateral medulla, increase sympathetic activity to the heart and blood vessels.
10026342
c
Rostral ventrolateral medulla
QuestionChoice
This is incorrect. Whilst the paraventricular nucleus is involved in the baroreceptor reflex pathway, it is not the site where afferent fibres from the carotid sinus first arrive as that is the nucleus tractus solitatius. Instead, it receives electrical activity from the nucleus tractus solitarius to increase ADH release from the hypothalamus.
10026344
e
Paraventricular nucleus
Concept
Chapter
2693
4219
Baroreceptor reflex
Topic
159
Cardiovascular physiology
17666
As part of the baroreceptor reflex, once a drop in blood pressure has been detected at the carotid sinus, which area of the brain is an impulse sent to?
a