To effectively replicate the movements of humans and animals, robots should integrate muscle-like structures. These artificial muscles should attain an optimal performance across all relevant actuation parameters, including ...
(Phys.org) —Metamaterials are defined as artificial materials that have been engineered to have unusual properties that are not found in nature. For instance, ordinary materials (say, a rubber band) that are under tension ...
(Phys.org) —In 1936, Alan Turing showed that all computers are simply manifestations of an underlying logical architecture, no matter what materials they're made of. Although most of the computer's we're familiar with are ...
(PhysOrg.com) -- "When you pick up a spoon with your fingers, you are able to move it from side to side and rotate it too by moving thumb and forefinger in opposition," Iain Anderson tells PhysOrg.com. Your hand is a soft ...
(PhysOrg.com) -- "Jellyfish are one of the most awesome marine animals, doing a spectacular and psychedelic dance in water," explain engineers Sung-Weon Yeom and Il-Kwon Oh from Chonnam National University in the Republic ...
A trio of paleontologists in Germany has found a fossilized vampire squid that they dated to 183 million years ago. In their paper published in the Swiss Journal of Palaeontology, Robert Weis, Ben Thuy and Dirk Fuchs describe ...
A pair of resource stewardship researchers at the U.S. National Park Service's, Natural Resource Stewardship and Science Directorate, working with a colleague from the University of Pennsylvania, has found via modeling that ...
A Cambridge University researcher has digitally reconstructed the missing soft tissue of an early human ancestor—or hominin—for the first time, revealing a capability to stand as erect as we do today.
Evolution
Jun 13, 2023
0
494
Paleontologists with Hokkaido University Museum working with a colleague from the American Museum of Natural History has found evidence that suggests one type of dinosaur may have been able to make bird-like calls. In their ...
A new study led by Southwest Research Institute Research Scientist Dr. Danna Qasim posits that interstellar cloud conditions may have played a significant role on the presence of key building blocks of life in the solar system.
Astrobiology
Jan 11, 2023
3
140
Muscle (from Latin musculus, diminutive of mus "mouse") is the contractile tissue of the body and is derived from the mesodermal layer of embryonic germ cells. Muscle cells contain contractile filaments that move past each other and change the size of the cell. They are classified as skeletal, cardiac, or smooth muscles. Their function is to produce force and cause motion. Muscles can cause either locomotion of the organism itself or movement of internal organs. Cardiac and smooth muscle contraction occurs without conscious thought and is necessary for survival. Examples are the contraction of the heart and peristalsis which pushes food through the digestive system. Voluntary contraction of the skeletal muscles is used to move the body and can be finely controlled. Examples are movements of the eye, or gross movements like the quadriceps muscle of the thigh. There are two broad types of voluntary muscle fibers: slow twitch and fast twitch. Slow twitch fibers contract for long periods of time but with little force while fast twitch fibers contract quickly and powerfully but fatigue very rapidly.
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