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Flashcards in Part 4 Deck (59)
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1

As arterial pressure falls, there is a critical below which flow ceases due to?

Closure of arterioles

2

This critical luminal pressure is required to keep arteriole from?

Closing completely

3

Vascular tone is proportional to?

CCP (critical closing pressure)

4

What happens if cardiac output is stopped?

Arterial pressure falls
Venous pressure rises

5

Mean circulatory filling pressure = equilibration of pressure where?

Arterial BP = Venous BP

6

Equilibration pressure may be prevented by?

Closure of the arterioles (CCP)

7

Mean circulatory filling pressure is responsible for?

Pressure gradient driving peripheral venous return

8

At a given MCFP, as central venous pressure increases, venous return will?

Decrease

9

If MCFP = CVP, venous return goes to?

0

10

As central venous pressure increases, cardiac output increases due to?

Intrinsic and Extrinsic effects

11

The pressure in the central veins (SVC &IVC) at the entry into the right atrium is called?

Central Venous Pressure

12

Central venous pressure =?

R atrial pressure

13

Collection of neurons in the medulla and pons is called?

Vasomotor Center

14

What are the 4 main regions in the vasomotor center?

1. Pressor Center
2. Depressor Center
3. Sensory Area
4. Cardioinhibitory area

15

The pressor center increases?

Blood pressure

16

The depressor center decreases?

Blood Pressure

17

The sensory area mediates?

Baroreceptor reflex

18

Cardioinhibitory area stimulates?

CN X

19

Where is the pressor center located?

Anterolateral area of upper medulla

20

Pressor center projects norepinepherine to?

IML horn cells (pre-ganglionic SNS)

21

What are the effects of the pressor center?

Vasoconstriction
Stimulate cardiac activity
Tonically active exciting SNS outflow

22

The pressor center is also called?

Vasoconstrictor center "C1"

23

Fibers from depressor center, project into and inhibit?

Pressor Center

24

Where is the depressor center located?

Anterolateral lower medulla oblongata

25

The effects (by inhibiting pressor center) of the depressor center include?

Vasodilation
Decreased cardiac activity

26

What is another name for the depressor center?

Vasodilator area "A1"

27

Where is the sensory area "A2" located?

Posterolateral portions of medulla and pons

28

Sensory area is more specifically located in?

Nucleus tractus solitarius

29

Sensory area receives input primarily from?

CN 9 and 10

30

Sensory area outputs to both?

Pressor and Depressor Centers