For example, our elbow joint in the arm has two muscles ... Biological processes of the human body. You could get a skeleton model and connect rubber bands to the bones in order to demonstrate ...

Muscles can only contract and relax, so they always work in pairs called antagonistic muscles. Skeletal muscle is joined to bones ... For example, in your arm, your biceps and triceps are ...

But Lucy and other fossil finds reveal that more than 3 million years ago, a relatively small-brained, ape-faced human ancestor ... body as she moved. Lucy: arm bones With dangling, powerful ...

And yet, its humerus (an arm bone) is quite human-like. Characteristics of its ... braincases and relatively large teeth and chewing muscles are similar to those of chimpanzees.

But while trunks may be structured like a tongue and function like an arm, they are ... compared to around 650 muscles in the entire human body. Normally, muscles depend on bones and joints ...

The Olduvai Gorge bone tools were found alongside various stone implements made around the same time. The addition of bone implements to the human tool ... as well as muscles and skin.

Our ancestors were making tools out of bones 1.5 million years ago, winding back the clock for this important moment in human evolution ... made out of the leg and arm bones of big mammals ...

The 27 tools, discovered at a rich paleoanthropological site called Olduvai Gorge, were probably created by Homo erectus, an early human species ... of bones, as well as muscles and skin.

Our ancestors were making tools out of bones 1.5 million years ago, winding back the clock for this important moment in human evolution ... made out of the leg and arm bones of big mammals ...