30 Questions
Which area inhibits the activity of the vasoconstrictor area?
Vasodilator Area
Which nerve carries parasympathetic nerve activity to the heart?
Vagus nerve
Which neurotransmitter is associated with alpha adrenergic receptors?
Norepinephrine
Which blood vessels are innervated by sympathetic fibers?
Veins
Which neurotransmitter is associated with beta adrenergic receptors?
Epinephrine
What can activation of sympathetic vasodilatory fibers cause?
Vasodilation in brain vessels
What happens to basal blood pressure when sympathetic nerve activity is blocked?
Basal blood pressure decreases
Which branch of the autonomic nervous system has the most powerful influence on vascular tone and cardiac function?
Sympathetic
What effect does the sympathetic nervous system have on veins?
Decreases volume
Which area in the brain stem transmits sympathetic impulses to blood vessels?
Vasomotor Center
What is the main function of the vasoconstrictor area in the brain stem?
Maintains vasomotor tone of blood vessels
Which part of the circulation does not have autonomic innervation?
All parts have autonomic innervation
What is the effect of the parasympathetic nervous system on cardiac function?
Decreases heart rate
Which branch of the autonomic nervous system has a small effect on cardiac contractility?
Parasympathetic
Which component of the baroreflex control system detects arterial pressure by sensing wall stretch?
Sensor/detector
Which region of the brain is responsible for processing the signals from the baroreceptors?
NTS
Which nerve pathway is responsible for transmitting the signals from the carotid baroreceptors to the NTS?
Glossopharyngeal nerves
At what range of arterial pressure are the baroreceptors most sensitive?
Normal MAP (100 mm Hg)
What happens to the baroreceptor discharge when there are small changes in blood pressure near the normal MAP range?
Increases
What is the primary function of the baroreceptor system?
To reduce minute to minute variation in arterial pressure
What happens to the baroreceptors when they are exposed to sustained changes in blood pressure?
They become less sensitive
Which reflex is activated when mean arterial pressure falls below 60 mm Hg?
Arterial Baroreflex
Which reflex increases blood pressure to ensure sufficient blood supply to the brain?
Cushing Response
Which reflex is activated by an increase in atrial pressure and causes an increase in heart rate?
Bainbridge Reflex
Which reflex is activated by low pressure receptors in the atria and pulmonary arteries?
Arterial Chemoreflex
Which reflex cuts off blood supply to activate the CNS ischemic response?
Cushing Response
Which reflex is activated by stretch of the sinus node and increases heart rate?
Bainbridge Reflex
Which reflex is also known as the Atrial Reflex Control of the Heart?
Bainbridge Reflex
Which reflex mechanism is activated by changes in arterial pressure?
Arterial Baroreflex
Which reflex mechanism is activated by low pressure receptors in the atria and pulmonary arteries?
Arterial Chemoreflex
Test your knowledge on the anatomy and control of baroreceptors in the baroreflex system. This quiz will cover the components of the baroreflex, including the sensor/detector, central sensory center (NTS), and effector (autonomic nervous system). Explore the role of baroreceptors in detecting arterial pressure and the location of these sensors in the carotid sinuses and aortic arch.
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