<em><u>Answer:Anatomically, respiratory tract is divided into upper (organ outside thorax - nose, pharynx and larynx) and lower respiratory tract (organ within thorax - trachea, bronchi, bronchioles, alveolar duct and alveoli). The discussion is mainly concentrated on the lower respiratory tract and the related physiology.</u></em>
<em><u /></em>
Tundra biome has a very harsh winter and a cool summer. It has a very low level of precipitation. Because the ground is permanently frozen, only algae, mosses, and lichens are found as vegetation. Animals that live in this biome must be well equipped to combat the very cold weather like the polar bear, artic fox, and snow owl.
<span>There are three phases of clnic study and one post approval phase required by the Food and Drug Administration (FDA) for a New Drug Application (NDA). Phase IV which is a common stipulation by the FDA includes continual evaluation of the drug after approval has been granted.</span><span />
The Myofilaments being used on a muscle contraction would return to their resting state when the sarcomeres would relax. The Sarcomeres are the individual contractile of the myofibrils which are then considered as the tiny rod like elements that are found within the muscle cells.
Your Answer would be 3. Also known as Lithium.
