The Changes in Vascular Resistance, Pressure and Blood Flow of the Crocodilian Heart During Breath Holding and Diving
The crocodilian heart is an interesting example of the adaptations animals can undergo to survive in aquatic environments. During breath holding and diving, there are several changes in vascular resistance, pressure and blood flow that occur in the crocodilian heart and the vessels leaving the heart. In crocodiles, there is a decrease in systemic vascular resistance as the crocodile increases its breath holding time (Fernandez, et al. 2020). This decrease in resistance allows for a higher blood flow to the brain and the viscera, which is beneficial for the crocodile during long dives (Fernandez, et al. 2020). Additionally, this decrease in resistance helps to maintain a lowered blood pressure, which helps the crocodile to conserve oxygen (Gilles, et al. 2017).
In the vessels leaving the heart, there is also a decrease in pressure. During breath holding and diving, the pressure in the descending aorta decreases as the crocodile increases its breath holding time (Gilles, et al. 2017). This decrease in pressure helps to reduce the amount of oxygen consumed during the dive. Cont…
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