Our Human bodies have many deficiencies — organs and systems that don’t work very well. That’s because they were evolved, not designed by a God.
Our organs and systems are clumsy and sub-optimal because evolution can only work with the genetic material and the environment that it has at hand.             

The following seven quotations are from S. Jay Olshansky, Bruce A. Carnes, & Robert N. Butler (as published in their article, “If Humans Were Built to Last,” Scientific American, 2003.)  

“A number of the debilitating and even some of the fatal disorders of aging stem in part from bipedal locomotion and an upright posture — ironically, the same features that have enabled the human species to flourish. Every step we take places extraordinary pressure on our feet, ankles, knees and back — structures that support the weight of the whole body above them. Over the course of just a single day, disks in the lower back are subjected to pressures equivalent to several tons per square inch.”

Bones that Lose Minerals After Age 30 —
“Demineralization makes bones susceptible to fractures and, in extreme cases, can cause osteoporosis (severe bone degeneration), curvature of the spine and ‘dowager’s hump.’”

Fallible Spinal Disks —
“Years of pressure on the spongy disks that separate the vertebrae can cause them to slip, rupture or bulge; then they, or the vertebrae themselves, can press painfully on nerves.”

Muscles that Lose Mass and Tone —
“Such atrophy can impede all activities, including walking. In the abdomen, hernias can arise as the intestines (always pulled by gravity) protrude through weak spots in the abdominal wall. Flaccid abdominal muscles also contribute to lower-back pain.”

Leg Veins Prone to Varicosity —
“Veins in the legs become enlarged and twisted when small valves that should snap shut between heartbeats (to keep blood moving up toward the heart) malfunction, causing blood to pool. Severe varicosities can lead to swelling and pain and, on rare occasions, to life-threatening blood clots.”

Relatively Short Rib Cage —
“Current cage does not fully enclose and protect most internal organs.”

Joints That Wear Out —
“As joints are used repetitively through the years, their cushioning and lubricating cartilage can grow thin, causing the bones to grind against each other. The resulting pain may be exacerbated by osteoarthritis and other inflammatory disorders.”

“To solve these problems, combinations of bio-technology and mechanical engineering could give us “thicker, stronger bones and thicker spinal discs, more ribs in the rib cage to better support internal organs, knees that bend backward, leg veins with more check valves, larger hamstrings and tendons, larger outer ear and more plentiful ear hairs, urethra that runs along the outside of the prostate, not through it, and a stronger sphincter valve on the bladder.” (See also our Essay, Cyborgs, Transhumanism, and Immortality.) which is online, free, and has no ads.)