Photograph by Rich Reid. Tundras are among Earth's coldest, harshest biomes. Tundra ecosystems are treeless regions found in the Arctic and on the tops of mountains, where the climate is cold and windy and rainfall is scant. Tundra lands are snow-covered for much of the year, until summer brings a burst of wildflowers.
Muscle is a soft tissue found in most animals. Muscle cells contain protein filaments of actin and myosin that slide past one another, producing a contraction that changes both the length and the shape of the cell. The statement that the tongue is the strongest muscle in the body appears frequently in lists of surprising facts, but it is difficult to find any definition of strength that would make this statement true. 2  Note that the tongue consists of eight muscles, not one.
The muscular system has a variety of roles within the human body. It is made up of muscles, joints, tendons, bones, ligaments and connective tissue that help to support intern â¦ al organs. All of these systems work together to provide the body with stability and posture, motion, heat, circulation and help in digestion.keletal muscles are attached to the bones allowing for movement. Smooth muscles line many of the bodies organs aiding in digestion. Smooth muscles line the walls of arteries, these regulate blood pressure. Lastly, cardiac muscle is what comprises the heart.