Flashcards in Part 4 Deck (59)
As arterial pressure falls, there is a critical below which flow ceases due to?
Closure of arterioles
This critical luminal pressure is required to keep arteriole from?
Vascular tone is proportional to?
CCP (critical closing pressure)
What happens if cardiac output is stopped?
Arterial pressure falls
Venous pressure rises
Mean circulatory filling pressure = equilibration of pressure where?
Arterial BP = Venous BP
Equilibration pressure may be prevented by?
Closure of the arterioles (CCP)
Mean circulatory filling pressure is responsible for?
Pressure gradient driving peripheral venous return
At a given MCFP, as central venous pressure increases, venous return will?
If MCFP = CVP, venous return goes to?
As central venous pressure increases, cardiac output increases due to?
Intrinsic and Extrinsic effects
The pressure in the central veins (SVC &IVC) at the entry into the right atrium is called?
Central Venous Pressure
Central venous pressure =?
R atrial pressure
Collection of neurons in the medulla and pons is called?
What are the 4 main regions in the vasomotor center?
1. Pressor Center
2. Depressor Center
3. Sensory Area
4. Cardioinhibitory area
The pressor center increases?
The depressor center decreases?
The sensory area mediates?
Cardioinhibitory area stimulates?
Where is the pressor center located?
Anterolateral area of upper medulla
Pressor center projects norepinepherine to?
IML horn cells (pre-ganglionic SNS)
What are the effects of the pressor center?
Stimulate cardiac activity
Tonically active exciting SNS outflow
The pressor center is also called?
Vasoconstrictor center "C1"
Fibers from depressor center, project into and inhibit?
Where is the depressor center located?
Anterolateral lower medulla oblongata
The effects (by inhibiting pressor center) of the depressor center include?
Decreased cardiac activity
What is another name for the depressor center?
Vasodilator area "A1"
Where is the sensory area "A2" located?
Posterolateral portions of medulla and pons
Sensory area is more specifically located in?
Nucleus tractus solitarius
Sensory area receives input primarily from?
CN 9 and 10