Renin is a protein (enzyme) released by special kidney cells when you have a decreased salt (sodium) level or low blood volume. If you have high blood pressure, your doctor may order a renin and aldosterone test to help determine the cause of your elevated blood pressure. Test results can help guide your doctor in choosing the correct treatment.
Quick Answer. Snakes can have live births, or they can lay eggs in order to have babies. Snake can reproduce every one to three years, and they can have up to 150 snake babies at a time. Keep Learning.
A copperhead snake, like the one pictured here, had a litter of four offspring in 2009. The problem was, the snake hadn't had any contact with a male in five years. Scientists confirmed recently the female copperhead was the first evidence of virgin birth in a pit viper snake.