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The Effects Of Temperature On The Cardiac System Of The American Lobster, Homarus Americanus, Elizabeth A. Owens
The Effects Of Temperature On The Cardiac System Of The American Lobster, Homarus Americanus, Elizabeth A. Owens
Honors Projects
The American lobster, Homarus americanus, inhabits a large oceanic range spanning from Labrador, Canada to North Carolina, USA. This geographic range varies in temperature by as much as 25ºC, and daily temperature fluctuations of up to 12ºC may occur at a single location depending on season, water depth, and tides. The cardiac system of the lobster is sensitive to these temperature changes, and has been shown to adjust its functioning over a large temperature range. A previous study showed that various functional parameters respond differently to temperature changes, but a stable cardiac output can be maintained over the range …
Dendrites Of Cardiac Ganglion Regulate Heartbeat Of American Lobster, Homarus Americanus, Through Stretch Feedback, Mara R. Chin-Purcell
Dendrites Of Cardiac Ganglion Regulate Heartbeat Of American Lobster, Homarus Americanus, Through Stretch Feedback, Mara R. Chin-Purcell
Honors Projects
Central pattern generators are neuronal networks that produce reliable rhythmic motor output. A simple pattern generator, known as the cardiac ganglion (CG), controls the heart of the American lobster, Homarus americanus. Previous studies have suggested that stretch feedback relays information to the cardiac ganglion about the degree of filling in the heart, and that this feedback is mediated by stretch-sensitive dendrites extending from CG neurons. I sought to determine the mechanisms behind this stretch feedback pathway. One hundred second extension pyramids were applied to each heart while amplitude and frequency of contractions were recorded; 87% of hearts responded to …