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.
Although not every species of snakes is known to lay eggs, about 70% of snakes do, while the rest give live birth. Snakes that give birth to their young without laying eggs are called viviparous. These snakes live in colder climates where eggs would not incubate as well.