#671 Why do people pass out from pain?
Why do people pass out from pain? Sudden pain can make the heart rate decrease, which lowers blood pressure, which can cause people to pass out. Fainting is technically known…
Why do people pass out from pain? Sudden pain can make the heart rate decrease, which lowers blood pressure, which can cause people to pass out. Fainting is technically known…
What causes a stroke? There are different types of strokes, but the most common is an ischemic stroke and it is caused by a blockage in one of the blood…
Watch on YouTube Why does blood show up under UV light? Because it absorbs all of the light and appears completely black. When we watch crime movies, the police often…
How can giraffes have such long necks? Giraffes have jointed vertebrae in their neck, a large amount of ligament, and an enormous heart to get the blood to their head.…
What are bruises? They are where blood vessels near the skin’s surface are broken after an impact. There are three layers in the skin: the epidermis, dermis, and hypodermis. The…
How is blood pressure measured? There are two measurements for blood pressure. The first number is the pressure of the blood when it is being pumped by the heart, called…
Why do people have different blood types? Scientists don’t know why humans have different blood types, but a good hypothesis is that they protect us as a species against different…
How much blood can you lose? Well, obviously all of it. How much blood can you lose and still function? Depending on your body size, from between 15 to 30%.…
I learned this today. Statins work by blocking a substance that our bodies need to make cholesterol. What is cholesterol? Cholesterol is a waxy, whitish-yellow fatty substance that our bodies…
I learned this today. A pacemaker works by using electrical stimulation to make the heart muscles contract and the heart pump blood. A pacemaker is used to alter the rhythm…