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This is the time when the heart fills with blood and gets oxygen. This is what your diastolic blood pressure number means: Normal: Lower than 80. Stage I: hypertension: 80-89. Stage II:...
It’s also used to diagnose prediabetes, in which your blood sugar level is higher than it should be but not yet high enough to qualify as diabetes. If your A1c levels are high enough to indicate...
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- Overview
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- Causes
- Effects
Normal body temperature averages 98.6 degrees. With hypothermia, core temperature drops below 95 degrees. In severe hypothermia, core body temperature can drop to 82 degrees or lower.
During exposure to cold temperatures, most heat loss -- up to 90% -- escapes through your skin; the rest, you exhale from your lungs. Heat loss through the skin happens primarily through radiation and speeds up when skin is exposed to wind or moisture. If cold exposure is due to being immersed in cold water, heat loss can occur 25 times faster than...
The hypothalamus, the brain's temperature-control center, works to raise body temperature by triggering processes that heat and cool the body. During cold temperature exposure, shivering is a protective response to produce heat through muscle activity. In another heat-preserving response -- called vasoconstriction -- blood vessels temporarily narro...
Normally, the activity of the heart and liver produce most of your body heat. But as core body temperature cools, these organs produce less heat, in essence causing a protective \\"shut down\\" to preserve heat and protect the brain. Low body temperature can slow brain activity, breathing, and heart rate.
Confusion and fatigue can set in, hampering a person's ability to understand what's happening and make intelligent choices to get to safety.
As you age, you may feel that dizzy sensation more frequently than you want to, but what does it mean and how can you prevent it? Understanding Dizziness. Dizziness describes a range of sensations...
Balance issues after 50 years old are often worse when you go from sitting to standing up, walk around, or move your head horizontally or vertically. Balance issues often lead to feeling dizzy and...
Medically Reviewed by Melinda Ratini, MS, DO on April 28, 2023. Written by WebMD Editorial Contributors. 1 min read. Your BMI is based on your height and weight. It's one way to see if you're at a...
What Are Lymphocytes? Medically Reviewed by Zilpah Sheikh, MD on September 20, 2023. Written by WebMD Editorial Contributor. What Are Lymphocytes? Function of Lymphocytes. How to Test for...