Smooth muscles are also called involuntary muscles since you have no control over them. Smooth muscles work in your digestive system to move food along and push waste out of your body. They also help keep your eyes focused without your having to think about it.
Smooth muscle, found in the walls of the hollow internal organs such as blood vessels, the gastrointestinal tract, bladder, and uterus, is under control of the autonomic nervous system. Smooth muscle cannot be controlled consciously and thus acts involuntarily.
Your brain possesses what some researchers call "common drive." It wants to activate and relax all muscles in synchrony, including the opposing ones. It's probably why you find yourself swaying while trying to balance on one leg. When you start to teeter, your mind drives all the muscles to stiffen at the same time.
The Stapedius, the smallest skeletal muscle in the human body, which is about 1 mm in length, is regarded to be the weakest muscle. It originates from a prominence known as the pyramidal eminence at the posterior edge of the tympanic cavity. It inserts into the stapes' neck.
The hardest working muscle is the heart. It pumps out 2 ounces (71 grams) of blood at every heartbeat. Daily the heart pumps at least 2,500 gallons (9,450 liters) of blood. The heart has the ability to beat over 3 billion times in a person's life.
Auricular Muscles
Located around the human ear, these vestigial muscles are responsible only for ear wiggling.
Estimates vary, but researchers have pegged the amount of muscle mass recruited during maximal exercise at around 60%; even elite athletes who have trained to get more output from their musculature might only harness around 80% of their theoretical strength.
Eye muscles are the busiest muscles in the body. Scientists estimate they may move more than 100,000 times a day!
Cardiac muscle, like skeletal muscle, is made up of sarcomeres that allow for contractility. However, unlike skeletal muscle, cardiac muscle is under involuntary control.
The human limit of strength is considered to be 1,800-2,200 lbs. (about 816.46-997.90 kg) over-head, and 3,500-4,000 lbs. (about 1587.57-1814.36 kg) bench press. If a user with peak human strength was to have an adrenaline rush, it could push them into Enhanced Strength, but not to Supernatural Strength.
A good lean muscle percentage range should be about 70% to 90% to be considered healthy. That means your body fat percentage ranges from 10-30%. Athletes typically range in the 7-22% body fat for maximum performance. Men tend to be on the higher side with lean mass in 80-90% range and woman in the 70-85% range.
For every 1 square centimetre of cross sectional area, muscle fibres can exert a maximum force of approximately 30–40 newtons (the weight of a 3–4 kg mass).
Glutes and Hips
The glutes and hips are some of the most common weak muscles. Inactivity from sitting is often the culprit.
Glute Muscles
Perhaps the most neglected muscle group in the body, the Glutes are also one of the most important muscle groups for proper biomechanics and optimal sports performance. They're also connected to your spine, so weak Glutes muscles can lead to back pain and injury.
Between one quarter and one half of a person's body weight is made up of muscle. If all your muscles pulled together in one direction, they could lift 25 tons.
The Guinness Book of World Records (1985 edition) lists his feat of lifting 6,270 lb (2,840 kg) in a back lift as "the greatest weight ever raised by a human being".
“Glutes” are possibly the laziest muscles we have, so we need to make them a priority in our training or we face ongoing injuries. The laziest of the gluteal muscle trio is gluteus medius (or “glute mede”). The glute mede runs from the top ridge at the back of the pelvis to the hip.
The palmaris longus muscle runs from the wrist to the elbow. About 10% of humans do not have it. If you rest the back of your wrist on a table and connect your thumb to your pinky, you may see a band of muscle pop up on your wrist. That is a vestigial muscle called the palmaris longus.
The appendix may be the most commonly known useless organ.
Plant-eating vertebrates still rely on their appendix to help process plants, but the organ is not part of the human digestive system.
There are enhancements you can make but these have limits. If you go by a standard deviation 15 chart for IQ like Wechsler or the 5th edition of Stanford-Binet, the chances of having an IQ of 195 is 1 out of 8 billion. So, this roughly sets the upper bound of human ability.