Flashcards in Blood Pressure, Heart Rate, Blood Flow, Etc Deck (39)
Sympathetic control of heart is between which vertebral levels?
What sympathetic ganglia control heart rate?
Middle and inferior cervical
Sympathetic does what in the heart?
Increases rate of contraction, speed of conduction, and force of contraction
Increase speed on conduction aka?
Increase speed of contraction aka?
Increase force of contraction aka?
How is the parasympathetic control of heart done?
Via vague nerve cardiac branches
What happens to hear under parasympathetic control?
Decreased rate of contraction, speed of conduction, and force of contraction.
Sympathetic and parasympathetic control increases/decreases HR by increasing/decreasing which phase?
Sympathetic and parasympathetic control increases/decreases conduction velocity by increasing/decreasing what?
Sympathetic and parasympathetic control increases/decreases force of contraction by increasing/decreasing what in which phase?
Blood pressure =
CO X peripheral resistance
CO is the product of what?
Stroke Volume X HR
CO = 70 ml X 70 beats/min = what?
Blood pressure may be affected by what three things?
What are two mechanisms of BP control. Which is fast and which is slow? Why?
baroreceptors - fast - neurotransmitter
renin-angiotensin-aldosterone - slow - hormonal dependent
Where are baroreceptor located?
Carotid sinus and aortic arch
Baroreceptor sense what?
Baroreceptor relay info via what? To where?
Afferent in CN IX and X
A drop in BP will cause heart rate to do what?
An rise in BP will cause heart rate to do what?
The reflex response to a rise or drop in BP is via what?
autonomic nervous system
Where are low pressure baroreceptor located?
SVC, IVC, and right atrium monitors
Poiselle's Law: Peripheral resistance (PR) is directly proportional to what?
Viscosity of blood and length of vessel
Poiselle's Law: PR is inversely proportional to what?
Radius of vessel to the 4th power
If blood vessel radius decreases by half then ...
Resistance increases by a factor of 16
The greatest resistance in the vascular system is offered by what?
What law states that pressure within a blood vessel is related the tension, size, and shape of the vessel?
La Place's Law
La Place's law governs what?
Blood flow through a tubular structure