1 An unopened container should last for 1-3 months at 40Â°F or less in the refrigerator, but some companies guarantee their product for up to 6 months.  If left in its partially-open original paper wrap, the exposed area of stick butter will begin to harden and smell stale after about a week, as oxygen sets in.
Quick Answer. Humans need a respiratory system because it is made up of organs that allow them to breathe. Breathing delivers oxygen to the body and takes away carbon dioxide. Every cell in the body needs oxygen to obtain energy from food. Continue Reading.
Respiratory System. The lungs are usually associated with the respiratory system. The respiratory system is a combination of bodily organs that aid in the breathing process. The airways, lungs and blood vessels are some of the major organs in this system.After air is carried through the airways, it is brought to the lungs where it is filtered and oxygen is passed through the blood vessels, while carbon dioxide is removed from the blood and transferred to the lungs.he heart is the major organ in the circulatory system, and the lungs and heart are always in cooperation. The heart passes used blood, rich in carbon dioxide, back into the lungs. The carbon dioxide passes into the alveoli of the lungs and is released when we breathe.