The blood transports oxygen, carbon dioxide, nutrients, water, hormones, waste substances and heat. The waste substances are moved to the liver and kidneys, which remove toxins from the blood. Urea is moved from the liver to the kidneys.
A:Optical illusions work because humans have binocular vision, which allows people to see different objects with each eye and sometimes the images do not merge properly. The brain must also interpret the signals correctly. Persistence of vision can also make optical illusions work.
A:Initially, a person's temporal and frontal lobes begin processing the sounds of music when a song begins to play, with brain cells deciphering melody, rhythm and pitch. Many researchers believe most activity concerning music happens in the brain's right hemisphere, while other researchers say it happens on both sides.
A:On average, food takes six to eight hours to pass through the stomach and small intestines. Liquids are not digested separately from foods, and they follow the same digestion process. In liquid-only diets, the digestion process may take fewer hours, as the stomach doesn't have to mechanically break down food.
A:The relationship between intelligence and creativity is not fully understood, although recent research suggests that intelligent people naturally crave higher levels of creativity. Research also suggests that intelligence and creativity overlap, meaning that intelligent individuals have a high capacity for creativity, and vice versa. This is somewhat counter to previous ideas that suggested creativity raises intelligence levels.
A:The torso is the main part of the body to which the neck and limbs attach, and it is a common feature of all vertebrates. The torso holds the body’s major internal organs except for the brain. Often, scientists refer to either the lower torso or the upper torso for better clarity.
A:Although there is some uncertainly regarding the function of the uvula, experts believe that this small flap-like structure in the back of the throat plays important roles in speech and swallowing. The uvula contains glands that secrete a large amount of saliva, which aids in digestion, keeps the mouth moist and prevents airborne pathogens from entering the respiratory canal.
A:The theories regarding why people yawn range from boredom to cooling the brain to helping the brain to stay more alert. Regardless of what causes yawning, it is widely accepted that yawning is contagious.
A:In the Chinese face reading practice, a round chin belongs to a person who is supportive, generous, sympathetic, kind and family-minded, whereas a square chin alludes to a more stubborn individual. A pointed or narrow chin characterizes a hot-tempered, stubborn, fiery, sensitive, fun-loving and sociable person who also loves to gossip.
A:According to the American Pregnancy Association, there are two ways that a woman can become pregnant with more than one child at a time, either multiple eggs are fertilized at the same time, or one fertilized egg divides into multiple embryos. The chances of becoming pregnant with more than baby is low however. In particular quintuplets are very rare, accounting for less than 41 births in 2011 out of almost four million total births, as noted by Multiples of America.
A:According to the BBC, boys grow taller than girls due to the growth spurt delay boys experience during puberty, adding two more years of childhood growth. Additionally, boys grow at a faster rate during this growth spurt due to the effects of testosterone, which prompts cells to grow.
A:The hammer in the ear, also called the malleus, transmits sound vibration to the anvil from the eardrum. The hammer and the anvil, also called the incus, are two of three very small, linked and movable bones in the ear. The other is the stirrup or stapes. Together, these three bones transmit sounds through the inner ear. InnerBody states that "the small bones create fluid membrane waves by converting compression sound waves from the eardrum."
A:An average person eats about 2000 calories a day, according to a study conducted by the University of Westminster's Human Performance Laboratory. The six women studied consumed between 1770 to 2600 calories a day, as published in the Mirror.
A:On average, girls reach their final adult height and stop growing by age 14 or 15, though this figure skews either younger or older depending on when puberty begins. Most girls experience a growth spurt between ages 10 to14, and a female's rate of growth peaks around two years after puberty begins, which is usually around age 12.
A:There are significant differences between the human brain and the brains of sheep; for instance, the human brain is larger in size and heavier when compared to a sheep’s brain. An adult human brain weighs 1,300 to 1,400 grams, while the brain of a sheep weighs in at around 140 grams. Sheep brains have less ridges and contours in comparison to human brains.
A:Dimples are the result of a deformity that makes facial muscles shorter than normal. The shorter muscles pull the skin when the person smiles, causing indentations in the skin known as dimples. As a person ages, dimples sometimes disappear as muscles naturally lengthen.