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.
Behavior [edit]. The shortfin mako shark is the fastest species of shark. Its speed has been recorded at 40 km/h (25 mph) with bursts of up to 74 km/h (46 mph). This high-leaping fish-they can leap approximately 9 m (30 ft) high or higher in the air-is a highly sought-after game fish worldwide.