control of blood pressure BAROREFLEXES Flashcards Preview

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Flashcards in control of blood pressure BAROREFLEXES Deck (24):
1

medulla (afferent activity)

- carotid sinus CN IX
- aortic arch CN X

2

autonomic nervous system

- parasympathetic NS
- sympathetic NS

3

Parasympathetic NS

- nicotinic
found in the ganglion, synapse of the spinal cord
- muscurinic
found in the end organs, smooth muscle, glands

4

sympathetic NS

- alpha 1
- alpha 2
- beta 1
- beta 2

5

alpha 1

- blood vessels

6

alpha 2

- CNS, pre synaptic terminal nerves, responsible for auto regulation and the release of NE

7

beta 1

- it increases heart rate, it affects blood pressure JG cells of the kidney release renin therefore it release AG II, aldosterone

8

beta 2

- blood vessels, non innervated not connected the ANS

9

MAP

- CO x TPR
- CO = HR x SV

10

MAP

- is controlled by ANS and hormones
- ANS
parasympathetic- M2 receptors will decrease heart rate
sympathetic- beta 1 increase heart rate, increase SV by JG cells action in the kidney and alpha 1 increase TPR because it vasoconstrics the blood vessels

11

MAP

HORMONES
Angiotensin II
- constricts vessels increase TPR
- increase aldosterone save Na and water, increase preload, increases SV
ADH
- attracts water causing increase volume
- increasing preload
- increasing SV
Atrial natriuretic peptide ANP produced by RA
- Na loss causing decrease SV

12

increase MAP, hypertension

- increase afferent fibers
- decrease CO by decrease HR, stimulating parasympathetic by M2 receptors
- decrease TPR by inhibiting alpha 1 (sympathetic)

13

baroreceptor reflex

- short term regulation of BP

14

RAAS

- long term regulation of BP

15

carotid massage

- increase afferent activity to the CNS
- stimulate parasympathetic increase
- inhibit sympathetic
- decreasing BP and HR

16

calculate for flow

- flow in a vessel
- flow in a organ

17

flow in a vessel

= pressure gradient/ resistance
= pressure gradient x radius 4 power/ VL

18

flow in a organ

- Ficks formula
- O2 uptake consumed by the organ
- A-V O2 content (conc) difference across the organ
flow= o2 uptake/ A-V

19

kidney use

- 200ml O2/min

20

renal artery

- O2 content 20% of renal volume .20

21

renal vein

- O2 content of 16% of renal volume .16

22

cardiac index

= CO/ body surface area

23

pulmonary artery

- carries deoxygenated blood

24

pulmonary vein

- carries oxygenated blood