Motility is the ability of an organism to move independently, using metabolic energy. This is in contrast to mobility, which describes the ability of an object to be moved. Motility is genetically determined, but may be affected by environmental factors. For instance, muscles give animals motility but the consumption of hydrogen cyanide (the environmental factor in this case) would adversely affect muscle physiology, causing them to stiffen, leading to rigor mortis. In addition to animal locomotion, most animals are motile (some move by passive locomotion). The term applies to bacteria and other microorganisms, and to some multicellular organisms, as well as to some mechanisms of fluid flow in multicellular organs and tissue. Motile marine animals are commonly called free-swimming, and motile non-parasitic organisms are called free-living.
Motility also refers to an organism's ability to move food through its digestive tract. There are two types of intestinal motility - peristalsis and segmentation. This motility is brought about by the contraction of smooth muscles in the gastrointestinal tract which mix the luminal contents with various secretions (segmentation) and move contents through the digestive tract from the mouth to the anus (peristalsis).
At the cellular level, different modes of motility exist:
The events that are perceived as movements can be directed:
The shoots of plants move by growing towards light. This is known as positive phototropism. The roots grow away from light. This is known as negative phototropism.
Division of the cytoplasm, known as cytokinesis, follows telophase. During division, cell organelles such as mitochondria and chloroplasts become distributed evenly between the cells. In animal cells, division is by in-tucking of the plasma membrane at the equator of the spindle, 'pinching' the cytoplasm in half (Figure 3.15). In plant cells, the Golgi apparatus forms vesicles of new cell wall materials which collect along the line of the equator of the spindle, known as the cell plate. Here, the vesicles coalesce forming the new plasma membranes and cell walls between the two cells (Figure 3.17).
For cells to function properly, they must organize themselves in space and interact mechanically with their environment... Eucaryotic cells have developed... the cytoskeleton... pulls the chromosomes apart at mitosis and then splits the dividing cell into two... drives and guides intracellular traffic of organelles... enables cells such as sperm to swim and others, such as fibroblasts and white blood cells, to crawl across surfaces.
"capacity of movement," 1827, from French motilité (1827), from Latin mot-, stem of movere "to move" (see move (v.)).
During development, any change in cell shape is preceded by a change in gene activity. It is the cell's origin and environment that determine which transcription factors are active within a cell, and, hence, which genes are turned on, and which proteins are produced.
Cyanide is well known in murder mysteries - and has been used in real murders too. The poison acts on cytochrome oxidase in the electron transport chain, preventing the production of ATP. The cells of the body cannot function without their energy supply, so the muscles spasm and the victim cannot breathe.
As the muscles run out of ATP, the muscle fibres become permanently contracted and lock solid. This produces a stiffening effect which is known as rigor mortis.
We encourage the continued development and refinement of devices for monitoring the activity and energetics of free-swimming fish
Acoustic telemetry was used to monitor ambient water temperature and tissue temperature in free-swimming bluefin tuna (Thunnus thynnus Linneaus [sic], 1758) over periods ranging from a few hours to several days.
Skeletal muscle is the type of muscle you use to move, e.g. the bicep and triceps move the lower arm. Skeletal muscles are attached to bones by tendons. Ligaments attach bones to other bones, to hold them together. Skeletal muscles contract and relax to move bones at a joint.
The muscle mass is not just concerned with locomotion. It assists in the circulation of blood and protects and confines the visceral organs. It also provides the main shaping component of the human form.