Angiotensin II is a potent vaso-active peptide that causes blood vessels to constrict, resulting in increased blood pressure. Angiotensin II also stimulates the secretion of the hormone aldosterone from the adrenal cortex. Aldosterone causes the tubules of the kidneys to increase the reabsorption of sodium and water into the blood.
The most reliable record of a Blue Shark at speed is 24.5 miles (39.4 kilometres) per hour for a 6.5-foot- (2-metre-) long individual. The Shortfin Mako (Isurus oxyrinchus) is probably the champion speedster among sharks.
Based on the video, the great white shark that struck the cage didnât appear to be fully grown, as Boston.com points out. Nevertheless, white sharks can swim as fast as 35 mph underwater and have been known to attack with such momentum that they are often carried fully out of the waves. These breach attacks, which are common off the coast of South Africa, routinely yield stunning footage, as the Huffington Post points out.