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TEMPERATURE AND FREQUENCY OF CARDIAC CONTRACTIONS IN EMBRYOS OF LIMULUS.

W J Crozier¹, T J Stier

¹Laboratory of General Physiology, Harvard University, Cambridge.

The Journal of General Physiology

|October 30, 2009

Summary

The myogenic heart beat frequency in Limulus embryos shows temperature variations before nervous system control. These findings differ from cardiac ganglion control and highlight embryo-specific critical temperatures.

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Area of Science:

Developmental Biology
Physiology
Cardiovascular Research

Background:

The heart's beat frequency is influenced by temperature.
Nervous system control of heart beat develops later in embryonic stages.

Purpose of the Study:

To characterize temperature effects on the myogenic heart beat frequency in Limulus embryos.
To compare embryonic heart beat temperature relations with those under nervous control.

Main Methods:

Observation of heart beat frequency in Limulus embryos across a temperature range.
Analysis of temperature-dependent variations in individual embryos.

Main Results:

Identified specific temperature characteristics for myogenic heart beat frequency (e.g., 11,500, 16,400).

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Observed variations in temperature sensitivity among individual embryos.

Noted differences from temperature effects seen with cardiac ganglion control.

Conclusions:

Embryonic heart beat exhibits unique temperature-dependent properties distinct from adult nervous control.
Critical temperatures for heart function vary between Limulus embryos.
These findings inform the understanding of temperature effects on myocardial explants.