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This allows the heart to keep pumping without getting fatigued.</dd> </dl> <dl> <dt>Question: Which of these bodily responses is a holdover from animal ancestors dealing with cold?</dt> <dd>Answer: Goosebumps happen when tiny muscles in the skin’s hair follicles pull hair upright. For animals with thick fur, this offers greater insulation. Unfortunately, human body hair is too short to trap heat this way.</dd> </dl> <dl> <dt>Question: The paper-thin tympanic membrane can be found in what body part?</dt> <dd>Answer: Derived from the Latin for “drum” (also where <em>timpani</em> comes from), the tympanic membrane is the eardrum. When sound waves hit this membrane, it vibrates, sending signals to the inner ear and eventually to the brain.</dd> </dl> <dl> <dt>Question: True or false: Veins look blue because the unoxygenated blood in them is blue.</dt> <dd>Answer: Red portions of the visible light spectrum easily penetrate skin and become absorbed by hemoglobin in the blood. Blue light scatters when it hits skin and gets reflected back to your eye, causing veins to appear blue.</dd> </dl> <dl> <dt>Question: Which of these body parts has the most bones?</dt> <dd>Answer: The hand has 14 phalanges, or finger bones, 5 metacarpal bones that make up the middle hand, and 8 carpal bones in the wrist for a total of 27 bones, the most of any body part.</dd> </dl> <dl> <dt>Question: True or false: Stress can cause hair to turn gray.</dt> <dd>Answer: Norepinephrine, also known as noradrenaline, is a neurotransmitter that conveys the body's fight-or-flight response; it’s been shown to cause graying when injected into otherwise unstressed lab mice.</dd> </dl> <dl> <dt>Question: If a frozen drink gives you “brain freeze,” which of these tactics helps ease the pain?</dt> <dd>Answer: When eating cold things too fast, the body tries to offset the lower temperature by quickly expanding blood vessels in the head. By pressing your tongue or thumb against the roof of your mouth, you help return your mouth’s temperature to normal.</dd> </dl> <dl> <dt>Question: Which of these body parts continues to get bigger with age?</dt> <dd>Answer: Ears, as well as noses, get longer as people age, but they aren’t growing. Instead, they are being pulled by gravity, causing them to stretch about a 10th of an inch every 10 years.</dd> </dl> <dl> <dt>Question: “The funny bone” is actually what type of anatomical part?</dt> <dd>Answer: For much of its path from spine to finger, the ulnar nerve is protected by layers of bone and muscle. However, there is a four-millimeter-wide spot at the elbow where the nerve is vulnerable. Hitting this spot, called “the funny bone,” results in a tingling sensation.</dd> </dl> <dl> <dt>Question: True or false: Human embryos have a tail for several weeks during gestation.</dt> <dd>Answer: About the fifth or sixth week of development, human embryos develop a lengthy tail—about 10–12 vertebrae long. The tail usually gets absorbed by the rest of the body, becoming the coccyx (tailbone).</dd> </dl> <dl> <dt>Question: Where are red blood cells created?</dt> <dd>Answer: Bone marrow, the soft gelatinous tissue that fills the cavity of your bones, produces all of your red blood cells as well as all of your platelets and most of your white blood cells.</dd> </dl> <dl> <dt>Question: Lunulae are small whitish half circles visible on what body part?</dt> <dd>Answer: Lunulae are the half-moon circles that appear on the base of fingernails, most noticeably on thumbs. They sometimes provide clues to medical conditions; for example, their absence may be an indication of a vitamin B<sub>12</sub> deficiency.</dd> </dl> <dl> <dt>Question: True or false: Logical thinkers are left-brain dominant, while artistic people are right-brain dominant.</dt> <dd>Answer: Brain imaging technology has found that there is no such thing as dominance when it comes to the brain’s hemispheres. While both halves tend to handle separate tasks, they work together in complex ways and are not linked to specific personality traits.</dd> </dl> <dl> <dt>Question: Which of these fluids is cleared out of the body on an “escalator” of tiny hairlike cilia?</dt> <dd>Answer: Often maligned as a gross side effect of being sick, mucus is constantly made by the body to line parts of the lung, where it catches harmful particles before they go too deep. When you’re healthy, tiny hairlike cilia move the mucus up and out, sliding down the back of the throat without you noticing it. But when you’re sick, the mucus is harder to move and requires aid, such as coughing.</dd> </dl> <dl> <dt>Question: Which of these is true about the outer part of the eye called the cornea?</dt> <dd>Answer: The cornea does not contain blood vessels, since the opaque fluid would obscure vision. 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