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.
Quick Answer. Snakes that give birth to live babies rather than lay eggs are boas, vipers and garter snakes. Snakes and reptiles that give birth to live young are called viviparous. These types of snakes generally live in colder climates where it would be hard for eggs to stay warm during incubation. Continue Reading.