Plan and conduct an investigation to provide evidence that feedback mechanisms maintain homeostasis.

  1. Health & Medicine

    Ultrasound might become a new way to manage diabetes

    Ultrasound turns on production of the hormone insulin in mice. Someday, it might help maintain healthy blood-sugar levels in people who were recently diagnosed with diabetes.

  2. Health & Medicine

    Explainer: The benefits of phlegm, mucus and snot

    There are many types of mucus in the body. They might seem gross, but these gloppy goos are the first line of defense against infection.

  3. Health & Medicine

    Explainer: What is the vagus?

    The vagus nerve runs from the brain all through the body. It controls many basic functions, including how fast the heart beats.

  4. Health & Medicine

    Owww! World’s hottest chili leads to days of severe headaches

    A man ate one of the hottest peppers in the world. About a minute later, his head began pounding. See why they didn’t permanently disappear for days!

  5. Health & Medicine

    Obesity makes taste buds disappear — in mice, anyway

    Mice that gained excessive weight on a high-fat diet also lost one in four taste buds.

  6. Health & Medicine

    Explainer: What is a concussion?

    A concussion is a severe type of head injury that can damage a brain for weeks to years — perhaps even a lifetime.

  7. Health & Medicine

    Explainer: What is a hormone?

    Various tissues secrete special chemicals, known as hormones. They travel, usually in blood, to a particular distant site where they tell certain cells it’s time to go to work.

  8. Animals

    Scientists Say: Extremophile

    Some species can survive high heat, freezing cold or other extreme environments. Scientists call these organisms extremophiles.

  9. Health & Medicine

    Is your home chilly? This might just be healthy

    Feeling mildly cold (or a bit too warm) forces the body to adjust what it’s doing to maintain a healthy temperature. And that can do a body good, data now show.

  10. Health & Medicine

    Hibernation: Secrets of the big sleep

    Mammals from bears to squirrels hibernate the winter away. Learning how they do it might one day help people mimic aspects of it to heal from brain injuries or voyage to Mars.

  11. Animals

    Explainer: How brief can hibernation be?

    Many animals frequently slow body functions and drop their temperatures — sometimes for just a day. Is that hibernation, or just torpor? Are the two even related? Scientists disagree.

  12. Animals

    Scientists Say: Hibernation

    Hibernation is more than a deep sleep. Animals that hibernate lower their body temperature and reduce their body activities for months.