Tundra. The tundra is a treeless polar desert found in the high latitudes in the polar regions, primarily in Alaska, Canada, Russia, Greenland, Iceland, and Scandinavia, as well as sub-Antarctic islands.
The muscles acting on the foot can be divided into two distinct groups; extrinsic and intrinsic muscles. 1  The extrinsic muscles arise from the anterior, posterior and lateral compartments of the leg.2  They are mainly responsible for actions such as eversion, inversion, plantarflexion and dorsiflexion of the foot. The extrinsic muscles arise from the anterior, posterior and lateral compartments of the leg. 2  They are mainly responsible for actions such as eversion, inversion, plantarflexion and dorsiflexion of the foot.
1 In addition to the skeletal muscles that contract to move your bones, you also have smooth muscles that are responsible for keeping your digestive system moving and your blood flowing. 2  Cardiac muscles don't attach to any bones, but they do the important work of keeping your heart beating. Every time you move your body from place to place, your bones, muscles, and joints are working together. 2  The bones that make up your skeletal system provide shape and protection. 3  Your skull protects your brain, your backbones protect your spinal cord, and your ribs protect your heart and lungs.