In the Forever Young Blog series on Your Body: An Owner’s Manual, the explanation of each body system inclulded a list of “5 Interesting Facts” about that system. To save wear and tear on your mouse-clicking finger, here in one place are
50 55 Interesting Facts about the human body . . .
5 Interesting Facts About The Circulatory System
- As an adult, you have about 5 quarts of blood.
- If connected end-to-end, your blood vessels would be about 60,000 miles long. That’s enough to circle the equator more than twice! (The circumference of the earth is 24,901 miles.)
- Over a 70-year lifetime, your heart will beat about 2 ½ to 3 billion times.
- About 1 to 2 gallons of blood are pumped through your heart every minute of the day.
- One drop of blood contains ½ drop of plasma, 5,000,000 red blood cells, 10,000 white blood cells and 250,000 platelets.
5 Interesting Facts About The Digestive System
- Every day the salivary glands produce about 1.9 quarts of saliva.
- Your small intestine is about 20 to 25 feet long!
- Your large intestine is only about five feet long. Obviously “small” and “large” refer to diameter, not length, where your intestines are concerned.
- The noise created by passing gas in influenced by the volume of gas, the force with which it is expelled and the tightness of the anal sphincter.
- Your stomach changes shape depending on how much food is in it and whether you are standing or lying down. It can hold up to eight cups (64 fluid ounces), or more.
5 Interesting Facts About The Endocrine System
- The endocrine system has no ducts. The hormones it produces are released directly into the bloodstream which carries it to another part of the body.
- The endocrine system is responsible for producing about 30 distinct hormones. All these hormones have very distinct jobs to do.
- The rush of adrenaline one gets when facing adventure or fear is the result of the adrenal glands production of epinephrine hormone, or adrenaline as we otherwise know it.
- We must be grateful to the pineal gland for our sweet sleep. It secretes melatonin which regulates our sleep.
- The endocrine system is responsible for the production of insulin. The failure to produce insulin will result in diabetes.
5 Interesting Facts About The Immune System
- Getting under 5 hours of sleep a night has been shown to greatly depress immune function in your body. Seven or eight hours of sleep each night is ideal.
- Studies show that people who lack humor in their lives tend to have less protective immune responses.
- While the body needs some sunlight to produce vitamin D, too much sunshine can suppress the immune system.
- As soon as one month after quitting smoking, smokers can strengthen the immune system.
- The number one way to boost the immune system is to reduce stress.
5 Interesting Facts About The Lymphatic System
- There are over 500 lymph nodes throughout the body, with the majority of them being located in the neck, groin and armpits.
- Lymph is a mixture of about 90% water and 10% solutes such as proteins, cellular waste products, dissolved gases, and hormones.
- The lymphatic system returns about 3.17 quarts (3 liters) of fluid each day from the tissues to the circulatory system.
- One way that lymph moves is via the squeezing action of the skeletal muscles surrounding the lymph vessels.
- On average, at any time about I to 2 quarts of lymph fluid circulates in the lymphatics and body tissues.
5 Interesting Facts About The Muscular System
- You sit on the largest muscle in your body, the Gluteus Maximus.
- The hardest working muscles are in the eye. Scientists estimate they may move more than 100,000 times a day!
- It takes 17 muscles to smile and 42 muscles to frown.
- There are muscles in the root of your hair that give you goose bumps.
- Muscles account for about 40% your body weight.
5 Interesting Facts About The Nervous System
- Your adult brain weighs about 3 pounds.
- There are millions of nerve cells in your body. In fact, the number exceeds the number of stars in the Milky Way Galaxy.
- The right side of your brain controls the left side of your body, while the left side of your brain controls the right side.
- As you grow older, your brain shrinks by a gram each year.
- At a given point of time, only four percent of the cells in your brain are active, the rest are kept in reserve.
5 Interesting Facts About The Reproductive System
- At birth, a woman has between 1 and 2 million potential eggs. By the time she reaches puberty, she has 300,000 to 400,000. However, she only releases about 300 to 400 during her child-bearing years.
- About 500 million sperm mature every day in a healthy male.
- The average lifespan of an egg once it is released from the ovary is 12-24 hours.
- The average life span of a sperm is 2-3 days.
- The female human body is capable of giving birth to 35 children in one lifetime.
5 Interesting Facts About The Respiratory System
- The right lung is slightly larger than the left.
- The breathing rate is faster in children and women than in men.
- We breathe about 9 to 20 times every minute.
- We inhale and exhale air about 22,000 times per day and in the process, transport about 300 cubic feet of air.
- The surface area of the lungs is roughly the same size as a tennis court.
5 Interesting Facts About The Skeletal System
- The femur, or thigh bone, is the largest bone in your body. The femur is about 1/4 of a person’s overall height.
- The smallest bone is the stirrup, deep in your ear. It’s about the size of a grain of rice.
- The bone that is broken most often is the collarbone. The scientific name for the collarbone is the clavicle.
- A baby is born with more bones than an adult. Many bones making up the skull and the spine fuse together as the body grows and becomes older.
- The hyoid bone, in your throat, is the only bone in your body not attached to another bone.
5 Interesting Facts About The Urinary System
- Adults pass about a quart and a half of urine each day.
- The volume of urine formed at night is about half that formed in the daytime.
- Normal urine is sterile. It contains fluids, salts and waste products, but it is free of bacteria, viruses and fungi.
- In ancient Egypt and Ireland, women stood to urinate. It was the men who sat or squatted.
- Since urine contains large amounts of urea, it is an excellent source of nitrogen for plants and a good accelerator for compost.