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How does the muscular system work with other systems?

The skeletal muscles attach to bones by tendons. When they receive the signal from the cerebellum to contract or extend, they pull the tendon, which in turn pulls the bone and moves the limb. For example, the muscles used in lifting an object with the arms include the biceps and forearm muscles. The biceps tendon connects to the forearm. When the biceps contracts, the tendon pulls the forearm. Skeletal muscles typically exist in pairs that complement one another, such as the biceps/triceps pair, the quadriceps/calf muscles and more.\nBy contrast, smooth muscle tissue and cardiac muscle are inv..

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What is the name of the element with electron configuration 1s22s22p63s23p2?

According to Chem Wiki from the University of California, Davis, silicon has four valence electrons, meaning it has four electrons in its outermost energy level. These four electrons play an important role in the chemistry of silicon. Silicon can use these electrons to chemically bond with other elements. These electrons are usually shared with other atoms.\nSilicon lies in the carbon family of elements. Although silicon is not a very reactive element, it is usually not found in its free form in nature. The element reacts readily with oxygen to form silicon dioxide, or plain sand, and silicate..

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What are the three types of symbiotic relationships?

Within a mutualistic relationship, both organisms benefit from the symbiotic pairing. The relationship between zebras and oxpecker birds is mutualistic. The oxpecker removes ticks and other parasitic organisms from the zebra's skin. The oxpecker is provided with food, while the zebra is provided with a form of pest control.\nCommensalism is a symbiotic relationship where one organism consumes the unused food of another, but does no harm to its host. An example of commensalism is the remora fish and a shark. The remora fish forms a temporary attachment to the shark and picks up food scraps..

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What is a non-allosteric enzyme?

A non-allosteric enzyme is any enzyme that is not an allosteric enzyme. All enzymes have an active site, which binds a substrate and causes the enzyme to function in a certain way. Allosteric enzymes also contain an allosteric site, which is bound by allosteric modulators. The binding of this second site on allosteric molecules either enhances or impairs the function of the enzyme. Non-allosteric enzymes do not have this second binding site and, therefore, are usually completely active or completely inactive.\nNon-allosteric enzymes serve as regulatory enzymes. Biochemical pathways are often i..

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How many days is it from the begining of the year until spring?

In some years, the first day of spring, or the vernal equinox, falls on March 21, though this is exceptional. While 36 out of 100 vernal equinoxes occurred on March 21 during the 20th century, all of the vernal equinoxes in the 21st century are on March 20 or earlier. In the Southern Hemisphere, the vernal equinox usually falls on September 22, or 265 days after January 1 in non-leap years.

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What is an earth tremor?

Earthquakes occur when the earth’s tectonic plates move and contact other plates. Sometimes the plates rub against each other laterally, while other times one plate moves underneath another. When this happens, it is called a subduction zone or a subduction-caused earthquake. In some particularly violent earthquakes, two plates collide into each other. This type of collision may even cause mountains to form, which happened millions of years ago when the Indian subcontinent crashed into Asia, producing the Himalayas.\nEarthquakes are rather common, though few are strong enough to cause much da..

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What instruments are used to track hurricanes?

Often, the first warning of a hurricane comes from satellite data. Satellites can measure water and air temperature as well as cloud density and movement, and give the first real sign of the rotation that signifies a newly born tropical storm. Once a storm begins to approach land, Air Force and NOAA pilots make reconnaissance flights into and above the developing storm. These planes often drop sensor gear into the storm to measure wind speeds at various altitudes, providing a three-dimensional picture of the storm's power.\nWhen the storm approaches the coast, land-based radar and weather..

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How are spores and seeds alike and different?

Due to their small size and light weight, spores, such as those produced by ferns and horsetails, can be carried long distances by the wind. This allows these types of plants to disperse efficiently, but some spores can easily wind up in areas that are not appropriate for survival. Spores only have one copy of each of the plant's chromosomes, and grow into a small plant stage known as a gametophyte. These release and receive gametes. Once fertilized, the eggs grow in place into the larger sporophyte, which has two copies of each chromosome. They then release the spores.\nSeeds are much la..

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What are some interesting facts about chlorine?

Chlorine has multiple uses; it is used to disinfect swimming pools and to sterilize drinking water. It is also used to manufacture several commonly used products like plastic, paints, medicines, textiles and paper. Chlorine is the 21st most abundant element on Earth, and it is the second most common halogen. In its natural gas state, chlorine is harmful to human health. It was the first gas to be used as a weapon during World War I. Its health effects are largely caused by it corrosive properties.

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What is the heart of a comet called?

As comets approach closer to the Sun, the frozen materials that make up the nucleus begin to boil off. As more of the nucleus is heated, particles and gases that have been released form a cloud known as the coma. Once comets have traveled further into the solar system, they begin to form a tail due to pressure from the solar wind.

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