Science

Refine Search

How do I describe the composition of blood?

The cellular material in blood is 99 percent red blood cells, and the remainder is platelets and white blood cells. About.com reports that the non-cellular composition of blood consists of water, proteins, amino acids, lipids, carbohydrates, vitamins, hormones, dissolved gases, electrolytes and cellular waste. The volume of each red blood cell is one-third hemoglobin. Blood plasma is over 90 percent water, with proteins its most abundant solute. Blood transports oxygen, carbon dioxide and nitrogen as its primary gases.\nVirtual Medical Centre indicates that blood makes up about 8 percent of on..

Continue Reading

What is the function of the arteries?

Arterial walls have three layers. The outer layer is elastic connective tissue, and the middle layer is made out of muscle. The inner lining of the artery is made up of smooth cells called the endothelium, which are similar to the cells in the heart. When the heart beats, the walls of the arteries enlarge to make room for the blood that's pumped into them. Then, the muscular layer contracts slowly to pump the blood further down the arteries to the arterioles and capillaries.\nThe largest artery in the body is the aorta, which connects directly to the heart. Two branches of the aorta are t..

Continue Reading

What are some science experiments about color?

To perform a color-changing experiment with a bottle of grape-flavored Powerade, pour 1/3 of the Powerade into a different container, then add one packet of Sweet 'n' Low to the Powerade bottle. Shake the bottle, then top it off with club soda, and let it sit with the cap off for 10 minutes. Place one cinnamon-flavored Altoid into the mixture, screw the cap on the bottle, and shake it. Set the bottle down, and the color disappears. Shake the bottle again, and the color reappears.\nA spectroscope experiment shows how visible light is composed of multicolored wavelengths. To create a s..

Continue Reading

What was the name of the first space shuttle to orbit the Earth?

The shuttle was ferried back to Florida on the back of a modified Boeing 747. Seven months later, Columbia launched again on a check flight, making it the first reusable orbiter. The first operational flight was in November 1982. Over the next 20 years, Columbia returned to space to launch and repair satellites and perform scientific experiments. Columbia was destroyed during the re-entry phase of its 28th mission on Feb. 1, 2003.

Continue Reading

What is a positive test result for starch?

According to the BBC, this color change occurs when the amylose in starch reacts with iodine. Starch is simple to test for at home, since iodine is readily available at most drugstores. A little iodine is mixed with the substance of interest; if starch is present, the color change occurs very rapidly. This test is useful for people who are starch intolerant. It can also be used by brewers to monitor the progress of a mash, the process by which starches in grain are converted to fermentable sugars.

Continue Reading

What are Dark Cloud gems?

Gems are acquired in the game by checking treasure chests in the back rooms of dungeons, fishing for points or purchasing the gems in the last dungeon. The gems appear at random in treasure chests, so it's not possible to find a specific chest for each gem. To get the gems by fishing, it is necessary to get 100 points, which can be spent on a gem. The price for gems in the last dungeon is 3,000 Gilda, which is the in-game unit used for money.

Continue Reading

Which part of an amino acid is always acidic?

Amino acids are so named due to the amine and carboxylic acid functional groups they contain. There are 20 common amino acids, with each being distinct in its R group side chain. The most simple amino acid, glycine, contains a single hydrogen as its R group.\nAmino acids are commonly sorted into three categories: nonpolar, polar uncharged and polar charged. The polar charged amino acids can be further divided into acidic or basic amino acids. The two acidic amino acids, aspartic acid and glutamic acid, both contain an aditional carboxylic acid functional group at the end of their R group.

Continue Reading

What is the vaporization that occurs on and below the surface of a liquid?

Evaporation results from increased temperature or lowered pressure. Condensation happens when the temperature is lowered or the pressure is increased. Infusing a liquid with energy moves the atoms or molecules around faster, and the ones on the surface escape to the atmosphere. The heat gives them enough energy to break the Van der Waals and other cohesion forces that sustain a liquid. This heat of vaporization must be removed from a gas to turn it back into a liquid.

Continue Reading

What is the chemical formula for a diamond?

Diamonds, graphite and soot are allotropes of one another. They have the same chemical formula, but they have different physical properties and look different. Diamonds do not conduct electricity well and take on a crystalline form. Graphite, on the other hand, consists of carbon atoms arranged in hexagonal layers. An electric current can run through graphite. Soot does not have a structured form.

Continue Reading

How long does it take to digest steak?

Steak and other red meat spends around four hours in the stomach being broken down, depending on the individual's metabolism rate. Once the meat has been broken down, it travels to the intestines. The nutrients are absorbed and distributed, and any waste is eliminated as excrement. The fat and protein in steak takes longer for the body to break down than the carbohydrates.

Continue Reading
Showing 7941 to 7950 of 10000 (1000 Pages)