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A hormone is a class of regulatory biochemicals that is produced in all multicellular organisms by glands, and transported by the circulatory system to a distant target organ to coordinate its physiology and behavior. Hormones serve as a major form of communication between different organs and tissues.
Jess hasn't slept properly for 10 years, since she witnessed a traumatic accident. Mike wakes in a panic several times a night. Lisa suffers from epic snoring. Can the experts ease their troubles?
2/3 • The Secrets of Sleep • 2017 • Health
Gloria Hunniford and Chris Bavin investigate the controversial diets that recommend cutting out entire food groups from what you eat. With the experts divided, could some of these quick-fix fads do you more harm than good?
5/5 • Food: Truth or Scare • 2017 • Health
In the early days of the space race, agency researchers in Russia and at NASA really weren't sure all what would happen to an astronaut in space. They didn't know if a human mind could handle actually seeing Earth or what would happen to the human body when exposed to long periods of weightlessness. Would their blood forget which way to pump? Would their eyeballs shift or their inner ears wig out? They sent up mice and monkeys and dogs, to see what happened, and in 1961, the Russians strapped a man to a rocket headed for orbit. Yuri Gagarin was the first person in space. The ultimate human guinea pig, he survived, becoming an international hero.
Eat less, move more. That’s been the mantra of the weight loss movement for decades. But as those who have fought the battle of the bulge will tell you, there’s a lot more to obesity than just too much junk food or too little willpower.
The Nature of Things • 2015 • Health
Of all the wonders of the human body, there's one more mysterious than any other. Blood: five precious litres that keep us alive. Yet how much do we really know about this sticky red substance and its mysterious, life-giving force?