Smooth muscle, such as in the digestive system, is also controlled by the autonomic nervous system. Like heart muscle, it is not under our conscious control. The SNS is responsible for controlling voluntary body movements, such as movement of the arms and legs.
The oceans cover 71 percent of the Earth's surface and contain 97 percent of the Earth's water. Less than 1 percent of the Earth's water is fresh water, and 2-3 percent is contained in glaciers and ice caps. The oceans contain 99 percent of the living space on the planet. If the ocean's total salt content were dried, it would cover the continents to a depth of 5 feet.
What percentage of the Earth's mass is water? The total amount of water as a percentage of all the mass that makes up our planet is estimated at 0.023%; that's 2.3 one-hundredths of one percent! Around 71% of Earth's su â¦ rface crust (the thin brittle rocky veneer) is covered by water..