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Physiology 3 Exam 2 > Part 4 > Flashcards

Part 4 Flashcards

1
Q

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

A

Closure of arterioles

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2
Q

This critical luminal pressure is required to keep arteriole from?

A

Closing completely

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3
Q

Vascular tone is proportional to?

A

CCP (critical closing pressure)

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4
Q

What happens if cardiac output is stopped?

A

Arterial pressure falls

Venous pressure rises

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5
Q

Mean circulatory filling pressure = equilibration of pressure where?

A

Arterial BP = Venous BP

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6
Q

Equilibration pressure may be prevented by?

A

Closure of the arterioles (CCP)

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7
Q

Mean circulatory filling pressure is responsible for?

A

Pressure gradient driving peripheral venous return

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8
Q

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

A

Decrease

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9
Q

If MCFP = CVP, venous return goes to?

A

0

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10
Q

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

A

Intrinsic and Extrinsic effects

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11
Q

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

A

Central Venous Pressure

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12
Q

Central venous pressure =?

A

R atrial pressure

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13
Q

Collection of neurons in the medulla and pons is called?

A

Vasomotor Center

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14
Q

What are the 4 main regions in the vasomotor center?

A
  1. Pressor Center
  2. Depressor Center
  3. Sensory Area
  4. Cardioinhibitory area
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15
Q

The pressor center increases?

A

Blood pressure

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16
Q

The depressor center decreases?

A

Blood Pressure

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17
Q

The sensory area mediates?

A

Baroreceptor reflex

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18
Q

Cardioinhibitory area stimulates?

A

CN X

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19
Q

Where is the pressor center located?

A

Anterolateral area of upper medulla

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20
Q

Pressor center projects norepinepherine to?

A

IML horn cells (pre-ganglionic SNS)

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21
Q

What are the effects of the pressor center?

A

Vasoconstriction
Stimulate cardiac activity
Tonically active exciting SNS outflow

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22
Q

The pressor center is also called?

A

Vasoconstrictor center “C1”

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23
Q

Fibers from depressor center, project into and inhibit?

A

Pressor Center

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24
Q

Where is the depressor center located?

A

Anterolateral lower medulla oblongata

25
Q

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

A

Vasodilation

Decreased cardiac activity

26
Q

What is another name for the depressor center?

A

Vasodilator area “A1”

27
Q

Where is the sensory area “A2” located?

A

Posterolateral portions of medulla and pons

28
Q

Sensory area is more specifically located in?

A

Nucleus tractus solitarius

29
Q

Sensory area receives input primarily from?

A

CN 9 and 10

30
Q

Sensory area outputs to both?

A

Pressor and Depressor Centers

31
Q

Sensory area mediates?

A

Baroreceptor reflex

32
Q

The baroreceptor reflex will?

A

Inhibit pressor center

Lower BP

33
Q

Where is the cardioinhibitory area located?

A

Medially next to dorsal motor nucleus of vagus

34
Q

Cardioinhibitory area will transmit impulses into dorsal motor nucleus of vagus by inhibiting?

A

Heart Activity

35
Q

Sympathetic vasoconstrictor tone is due to?

A

Pressor center input

36
Q

Sympathetic vasoconstrictor tone maintains what?

A

Arterial BP

37
Q

Rapid short term control of blood pressure involves?

A

Nervous system effect on vascular smooth muscle

38
Q

Long term control of blood pressure is dominated by?

A

Kidney (renal-body fluid balance)

39
Q

Contents involve?

A

Blood Volume

40
Q

Container involves?

A

Blood vessels

41
Q

Control of blood pressure is accomplished by either affecting?

A

Vascular tone or blood volume

42
Q

Spray type nerve ending in vessel walls is known as?

A

Baroreceptors

43
Q

Baroreceptors are especially abundant in?

A

Carotid Sinus

Arch of Aorta

44
Q

Baroreceptors are stimulated when?

A

Stretched

45
Q

When baroreceptors are stretched it inhibits pressor center via?

A

CN 9 and 10 & NTS

46
Q

What are the net effects of baroreceptors?

A

Vasodilation

Decreased Cardiac Output

47
Q

Baroreceptors are?

A

Carotid Sinus Reflexes

48
Q

Baroreceptors are more sensitive to?

A

Changing pressure rather than static pressure

49
Q

Baroreceptors have a buffer function in which change in BP is due to?

A

Change in body position

50
Q

Lack of long term control of baroreceptors is due to?

A

Adaptation

51
Q

Where are low pressure baroreceptors located?

A

Atrial walls

Pulmonary arteries

52
Q

Low pressure baroreceptors augment?

A

Arterial Baroreceptors

53
Q

Low pressure baroreceptors minimize pressure changes in response to?

A

Blood volume changes

54
Q

Baroreceptor reflex is?

A

Low pressure

55
Q

Baroreceptors decrease?

A

Heart Rate

56
Q

Baroreceptors increases?

A

Urine Production

57
Q

Increased urine production will decrease?

A

SNS in renal nerve

Secretion of ADH

58
Q

Bainbridge reflex will increase?

A

Heart Rate

59
Q

Stretch on atrial wall will release?

A

Atrial Natriuretic Peptide

Physiology 3 Exam 2 (6 decks)

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