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 the systolic pressure. The second number is the pressure of the blood between heartbeats, called the diastolic pressure. The amount of blood we have in […]
#506 How is blood pressure measured? Read More »
What causes rigor mortis? Rigor mortis is caused by the muscles in the body being unable to contract. Rigor mortis is Latin. Rigor means “stiff” and mortis means “death”. It happens because of the way that we extend and contract our muscles. If you want to reach out and pick up a cup of coffee,
#504 What cause rigor mortis? Read More »
Why does the body produce fat? The body produces fat to store and release energy, for insulation, and to regulate body health. Most of us have tried to lose weight, are trying to lose weight, or will try to lose weight at some point. What we mean by that is lose fat. However, we need
#502 Why does the body produce fat? Read More »
Can you eat the skin of all fruit and vegetables? Some fruits have a poisonous skin that it is better to avoid. The skin of some vegetables is too difficult to chew. What is a fruit? A fruit is a mature, ripened ovary, and the contents of the ovary. The ovary is the female part
#498 Can you eat the skin of all fruit and vegetables? Read More »
Why did early humans leave Africa? They were probably forced out by climate change, but they could have left because of their rising intelligence. Let’s look at the evidence for why paleontologists believe humans developed in Africa and then look at why they left. Humans probably separated from the common ancestor we share with other
#492 Why did early humans leave Africa? Read More »
Do any other animals cry? Yes, but only to lubricate their eyes. We have three types of tears. We have tears that lubricate and clean our eyes. These are called basal tears and they are created automatically. Every time you blink, the basal tears are spread across the eye and keep it wet and clear
#491 Do any other animals cry? Read More »
How do parrots talk? They can imitate human speech by passing air across the opening of their trachea using an organ called a syrinx. Parrots don’t talk in the wild. And when we say “talk”, they mimic human speech without necessarily understanding what they are saying. Some parrots have been taught to learn the names
#485 How do parrots talk? Read More »
Does blood volume decrease if a limb is amputated? Yes. The kidneys will monitor the blood pressure and try to lower the volume of blood if it is too high. People of the same weight and height don’t necessarily have the same amount of blood and the amount of blood a person has will vary
#483 Does blood volume decrease if a limb is amputated? Read More »
Why can’t all animals be domesticated? There are six criteria needed for an animal to be domesticable. The first animals were domesticated about 15,000 years ago. Early people were hunter-gatherers, but they transitioned to agriculture about 10,000 years ago and most animals we use today were domesticated after that. The first animals to be domesticated
#481 Why can’t all animals be domesticated? Read More »
Why do ostriches have two kneecaps? It (possibly) helps them to run faster. What does a kneecap do? The knee is basically a lever and the kneecap is the pivot point. In humans, the knee is the joint between the femur (thighbone) and the tibia (shinbone). The muscle on the front of the thigh bone
#480 Why do ostriches have two kneecaps? Read More »
