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.
1. How fast can the penguin swim? AdÃ©lie Penguins over long distances (10s to 100s of miles or km) can sustain speeds of about 5 mph (8 kph). In short bursts, in order to avoid being caught by leopard seals or in pursuing prey, they can move 5-6 times that fast.