This protein, from the bioluminescent jellyfish  Aequorea victoria, fluoresces with a peak wavelength of 508 nm (green light) when irradiated by ultraviolet or blue light (optimally 400 nm).

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#Unit 7. System Physiology – Animal

Large quantities of positive potassium ions diffuse out of the SA node.

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#Unit 7. System Physiology – Animal

Potassium channels remain open for another few tenths of a second, with resultant excess negativity inside the fiber; this process is called hyperpolarization.

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#Unit 7. System Physiology – Animal

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#Unit 7. System Physiology – Animal

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#Id: 4029

#Unit 7. System Physiology – Animal

The effects of the autonomic nervous system on heart rate are called chronotropic effects

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#Id: 4030

#Unit 7. System Physiology – Animal

Positive chronotropic effects are increases in heart rate.