patient HA, who was bedridden for a few days, feels dizzy and experiences significant increase in his heart rate after standing up? What will happen to his systemic arterioles regarding vascular tone changes? Diagram #1 (attached). Baroreceptor refle

Phlebotomy Essentials
6th Edition
ISBN:9781451194524
Author:Ruth McCall, Cathee M. Tankersley MT(ASCP)
Publisher:Ruth McCall, Cathee M. Tankersley MT(ASCP)
Chapter1: Phlebotomy: Past And Present And The Healthcare Setting
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  1. Why 60 years-old patient HA, who was bedridden for a few days, feels dizzy and experiences significant increase in his heart rate after standing up?
  2. What will happen to his systemic arterioles regarding vascular tone changes?

Diagram #1 (attached). Baroreceptor reflex and associated changes in cardiac output and arterial blood pressure.

Standing up after lying down
V in Arterial Pressure
I firing by Baroreceptors
I Parasympathetic discharge to
Sympathetic discharge
Sympathetic discharge
Sympathetic discharge to
heart
to heart
to veins
arterioles
Veins ↑
Arterioles ↑
T Heart Rate
constriction
constriction
↑ Venous
pressure
↑ Venous return
TEnd-diastolic
volume
↑ Stroke volume
1 Cardiac output
↑ Total peripheral resistance
↑ Arterial pressure
Transcribed Image Text:Standing up after lying down V in Arterial Pressure I firing by Baroreceptors I Parasympathetic discharge to Sympathetic discharge Sympathetic discharge Sympathetic discharge to heart to heart to veins arterioles Veins ↑ Arterioles ↑ T Heart Rate constriction constriction ↑ Venous pressure ↑ Venous return TEnd-diastolic volume ↑ Stroke volume 1 Cardiac output ↑ Total peripheral resistance ↑ Arterial pressure
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