Term
| What system controls BP on a second to second basis? |
|
Definition
| Sympathetic Nervous System (SNS) |
|
|
Term
| Negative feedback mechanism maintains the MAP at...? |
|
Definition
|
|
Term
| What is the breakdown of MAP and its individual control/affects? |
|
Definition
MAP=CO x TPR and CO=SV x HR
SV controlled by SNS (affecting contractility, after/preload)
HR controlled by SNS & PNS
TPR= radius, length, and viscosity (a1-receptor) via SNS |
|
|
Term
| Describe the negative feedback loop for BP control |
|
Definition
| Stimulus affects baroreceptors/volume receptors, acts on the control center- the Nucleus Tractus Solitarius in Medulla of brain stem-->effectors (heart and vessels)-->response |
|
|
Term
| What ist he control center of BP and where is it located? |
|
Definition
| Nucleus Tractus Solitarious (NTS) in the medulla of the brain stem |
|
|
Term
| Where are high blood pressure barocereptors located? |
|
Definition
*Arch of the aorta
*Carotid sinus
-Renal afferent arteriole too |
|
|
Term
| Where are low pressure baroreceptors located? |
|
Definition
-Wall of the right atrium
-SVC/IVC
-Pulmonary artery |
|
|
Term
| What do high and low pressure baroreceptors monitor, respectively? |
|
Definition
High pressure- Cardiac Output (SV x HR)
Low pressure- venous return
*Work together |
|
|
Term
| How can baroreceptors also be activated? |
|
Definition
Palpation- massage
CAROTID MASSAGE- DO NOT MASSAGE THE CAROTID IF PATIENT HAS LOW BP |
|
|
Term
| Nucleus Tractus Solitarius (NTS)- normal output |
|
Definition
-Inhibit vasomotor center
-Stimulate cardio inhibitory center |
|
|
Term
|
Definition
Angiotensinogen-->angiotensin I by Renin
Ang I --> Ang II by ACE
Causes increased BP
ACE inhibitors keep BP low |
|
|
