Cardio11 Flashcards
Baroreceptors & Chemoreceptors CIrculation Normal pressures
Receptors on the Aortic Arch transmit via the ______ nerve to the _________________.
Vagus n.
Solitary nucleus of medulla
What do the receptors on the aortic arch respond to?
INcreased BP (ONLY thing)
Receptors on the Carotid sinus transmits via the ______________ n. to the _________________.
Glossopharyngeal n.
Solitary nucleus of medulla
What do the receptors on the carotid sinus respond to?
INcrease & DEcrease in BP
How do baroreceptors respond to a Carotid massage?
INcreased pressure on Carotid a.
INcreased Stretch
INcreased Afferent Baroreceptor firing
DEcreased BP
What are the stimuli for the peripheral chemoreceptors located on the carotid and aortic bodies?
DEcreased (<60 mmHg)
INcreased PCO2
DEcreased pH of blood
What are the central chemoreceptors stimulated by?
Changes in pH & PCO2 of brain interstitial fluid, which in turn are influenced by arterial CO2
T/F - Central chemoreceptors do not directly respond to PO2.
True
What organ receives the largest share of systemic cardiac output?
Liver
Which organ has the highest blood flow per gram of tissue?
Kidney
In the heart, O2 demand is met by:
- INcreased extraction of O2 or INcreased coronary blood flow?
INcreased coronary blood flow
Pulmonary Capillary Wedge pressure (PCWP) is a good approximation of ________ pressure.
Left atrial pressure
PCWP > LV diastolic pressure, is seen in what type of heart condition?
Mitral stenosis
How do you measure PCWP?
Swan-Ganz catheter
How does blood flow to an organ remain constant over a wide range of perfusion pressures?
Autoregulation
