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Why are lipids insoluble in water?

The effect of mixing polar and nonpolar liquids is similar to mixing magnetized marbles with regular ones. The magnetized marbles do not actively exclude the normal ones, but the attraction between them is much stronger, which means they naturally come together and exclude the regular ones. Polar molecules, such as water, have a "dipole moment" that give them an unevenly distributed charge. Negative ends of polar molecules are attracted weakly to positive ends of other polar molecules. Nonpolar molecules lack this uneven distribution of charge.

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How long does it take a strained muscle to heal?

Most people with a strained muscle usually experience full recovery with proper treatment, explains Pietrangelo. Chances of recovery are higher when a person takes steps to prevent re-injury. It is important that patients follow all doctor’s instructions, especially after a surgery, and avoid engaging in strenuous physical activities until the strained muscle is fully healed.\nSherwin Ho, an associate professor of surgery at the University of Chicago Medical, explains to ABC News that a grade-two injury involves macroscopic tearing of the fibers and usually takes a person three to six weeks ..

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What are the benefits of purchasing a home solar power system?

A home solar power system generates power that reduces or eliminates the cost of purchasing electricity from a utility company. Solar systems are typically modular, allowing the addition of photovoltaic panels over time to increase capacity. In some states, the local power company may pay a homeowner for surplus energy generated, making solar panels a passive income source depending on location and effectiveness.\nA residential solar power system generally increases the value of the home or property, often up to 100 percent or more of the cost of the system. This rate of return is far higher t..

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What is being done to stop global warming?

One campaign designed to raise awareness on energy conservation is Earth Hour. It was founded in 2007 in Sydney, Australia, and is sponsored by the World Wildlife Fund. It is observed on the last Saturday of the month in March. Households and businesses are encouraged to turn off their lights for one hour.\nVehicle makers have made efforts to save on fuel and reduce pollution. In 1999, hybrid cars were introduced. Research on climate changes takes place in a variety of laboratory settings. Scientists' findings can be applied to practical settings, such as helping homeowners make their res..

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What is the job of the small intestine?

The small intestine processes about 2 gallons of food and secretions every day and is divided into three sections: the duodenum, the jejunum and the ileum. The small intestine is made up of four layers, just like every part of the gastrointestinal system. These four layers are the mucosa, the submucosa, muscularis and the serosa.

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What is the largest part of the neuron that contains the nucleus?

Some other organelles found in cell bodies are smooth and rough endoplasmic reticulum and mitochondria. However, neurons also have unique structures, such as dendrites, axons, synapse and myelin. Dendrites are branch-like extensions of the nerve cell while axons are long thread-like structures. The function of dendrites is to receive signals from other cells, which then pass to the cell body. Axons carry signals or information away from the cell body. Myelin is an outer covering found on some axons, and the synapse is the junction between two nerve cells. A synapse's function is to transm..

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What is the function of adrenaline?

According to News Medical the body releases adrenaline, also known as epinephrine, when the brain perceives a threat. Once adrenaline enters the bloodstream, it sparks a series of responses, all geared toward responding to the perceived threat. These responses include a rush of energy to allow muscles to engage quickly and powerfully, and increase in the blood's ability to clot in the event of a physical injury and increased hearing sensitivity.\nOn its You & Your Hormones website, the Society for Endocrinology reports that adrenaline's provocation of the flight-or-flight response is..

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Is there sound in space?

True sound waves are only able to spread through a medium that puts molecules in contact, or near contact, with each other. As the wave of sound passes, the affected molecules press against nearby, unaffected molecules. The result is a moving wave of compression that, in an atmosphere, can be picked up by a human ear. In a vacuum, no air exists to carry the compression wave. In near-empty space, any event, such as an impact or explosion, that creates a moving wave of sound inside an atmosphere is left without surrounding matter to carry away the energy as sound.\nElectromagnetic waves are able..

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What are the properties of magnets?

Every magnet has two poles: north and south. It is inside these two poles that the magnetic properties are stored. The strength of attraction between magnets depends on the strength of the magnetism found in each pole. This same principle is true for repulsion because magnets with strong poles possess a stronger repulsive force.

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Where do tornadoes occur?

Tornadoes, however, can form any place where the conditions are right, such as during severe thunderstorms when high wind speeds and rotation cause airborne water vapor to form into a funnel cloud.\nThe flat land of the Great Plains sits between the Appalachian and Rocky mountain ranges, creating a valley that is perfect for cool polar air to mix with warmer, wetter air from the Gulf of Mexico. This mixture of air is a ripe breeding ground for severe tornadoes, which are often spawned by hurricanes coming ashore from the Gulf of Mexico.\nTornadoes are less likely to occur in the mountains, alt..

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