QuestionSBA
QuestionChoice
Increased stimulation of the baroreceptors in the aortic arch and carotid bodies results in the increased firing of the afferent nerve fibres from the baroreceptors. These fibres synapse in the cardiac vasomotor centre of the medulla resulting in an increase in parasympathetic and a decrease in sympathetic stimulation to the heart, thereby reducing blood pressure.
10003945
e
Increased baroreceptor stimulation
QuestionChoice
Decreased total peripheral resistance means that the blood vessels are less constricted, and will therefore cause a fall in blood pressure.
10003944
d
Decreased total peripheral resistance
QuestionChoice
Sympathetic stimulation increases cardiac contractility, increasing cardiac output and blood pressure. Therefore a decrease in sympathetic stimulation will cause a fall in blood pressure.
10003942
b
Decreased sympathetic stimulation to the heart
QuestionChoice
Increased cardiac output results in increased stimulation of the baroreceptors in the aortic arch and carotid bodies. This results in the increased firing of the afferent nerve fibres from the baroreceptors. These fibres synapse in the cardiac vasomotor centre of the medulla and cause an increase in parasympathetic and a decrease in sympathetic stimulation to the heart, thus reducing blood pressure.
10003943
c
Increased cardiac output
QuestionChoice
This patient has presented with postural hypotension. The vagus nerve provides parasympathetic stimulation to the heart, reducing blood pressure. Therefore decreased vagal tone will cause a compensatory increase in blood pressure.
10003941
a
Decreased vagal tone
Concept
Chapter
2693
4219
Baroreceptor reflex
Topic
159
Cardiovascular physiology
13335
A 92-year-old woman attends her GP after experiencing syncopal episodes when standing up from a seated or lying position. The GP checks her seated and standing blood pressure and finds there is a systolic drop of 35mmHg.

Which of the following will cause a rise in blood pressure?
a