Page 232 - Color_Atlas_of_Physiology_5th_Ed._-_A._Despopoulos_2003

A. Compensation mechanisms for impending hypovolemic shock
Acute heart failure Hormonal causes Volume deficit
Blood pressure Blood volume
decreases decreases
Stimulus
Anaerobic Signal
glycolysis P O 2 Compensation
Chemosensors
Hypo- Thirst
Lactic acid thalamus
Presso-
sensors
pH 3

Medullary Circulatory Shock
centers
Volume Heart
sensors Renin ADH
Angiotensin II
1 Aldosterone Plate 8.17
Stimulation of
sympathetic system 4
Adrenal Adrenal
medulla cortex

Kidney
Epinephrine
Capillaries
Re-
absorption
of water
Arterial
vasoconstriction Capillary
mainly in kidneys, pressure
stomach, gut
and skin Renal
Venous blood flow
vasoconstriction Na +
retention
2 H 2 O influx
into capillaries GFR
Venous
return
Heart rate Oliguria
Myocardial
Peripheral contractility
resistance
Blood pressure rises Blood volume rises 219

Despopoulos, Color Atlas of Physiology © 2003 Thieme
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