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Hemodynamics of the lesser mouse deer, Tragulus javanicus
Summary
Mouse deer have uniquely spherical red blood cells, which normally increase blood viscosity. However, their lower packed cell volume compensates, maintaining normal blood flow and hemodynamics.
Area of Science:
- Comparative physiology
- Hematology
- Hemodynamics
Background:
- Mouse deer erythrocytes are the smallest known and are spherical, unlike the typical biconcave shape.
- This unique morphology is expected to increase in vitro blood viscosity.
Purpose of the Study:
- To investigate the hemodynamic consequences of spherical erythrocytes in mouse deer.
- To determine if compensatory mechanisms exist to maintain normal blood flow despite altered red blood cell shape.
Main Methods:
- Measurements of cardiac output, arterial pressure, and total peripheral resistance were taken.
- Packed cell volume was determined.
- Hemodynamic parameters were compared to expected values based on erythrocyte morphology.
Main Results:
- Mouse deer exhibited normal cardiac output, arterial pressure, and total peripheral resistance.
- Packed cell volume was significantly lower than typically observed.
- Despite spherical erythrocytes, blood viscosity and hemodynamics remained within normal ranges.
Conclusions:
- Reduced packed cell volume in mouse deer serves as a compensation for spherical erythrocytes.
- This compensation mechanism maintains normal blood viscosity and hemodynamic parameters.
- These findings contrast with human physiology, where high blood viscosity often leads to significant hemodynamic issues.