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Change in the shape of the hip may have led to the decrease in the degree of hip extension, an energy efficient adaptation. [1] [14] The ilium changed from a long and narrow shape to a short and broad one and the walls of the pelvis modernized to face laterally. These combined changes provide increased area for the gluteus muscles to attach ...
The loss of the intercranial joint was a direct functional necessity to strengthen the broad and long platybasic skull when the animal was out of the water. [2] The tubular lower jaw of the Elginerpeton , compared to the flat-lamina jaw shape of fishes gave it superior cross-sectional force, required when not supported in an aquatic setting ...
Skeletal System of Human Body Long bones are characterized by a shaft, the diaphysis, that is much longer than its width; and by an epiphysis, a rounded head at each end of the shaft. They are made up mostly of compact bone , with lesser amounts of marrow , located within the medullary cavity , and areas of spongy, cancellous bone at the ends ...
Movement is powered by skeletal muscles, which are attached to the skeleton at various sites on bones. Muscles, bones, and joints provide the principal mechanics for movement, all coordinated by the nervous system. It is believed that the reduction of human bone density in prehistoric times reduced the agility and dexterity of human movement.
Though these changes are usually temporary, some do have a long-term impact on human health. Short-term exposure to microgravity causes space adaptation syndrome, self-limiting nausea caused by derangement of the vestibular system. Long-term exposure causes multiple health problems, one of the most significant being loss of bone and muscle mass.
Summary of long-term adaptations to regular aerobic and anaerobic exercise. Aerobic exercise can cause several central cardiovascular adaptations, including an increase in stroke volume (SV) [5] and maximal aerobic capacity (VO 2 max), [5] [6] as well as a decrease in resting heart rate (RHR).
Wolff's law, developed by the German anatomist and surgeon Julius Wolff (1836–1902) in the 19th century, states that bone in a healthy animal will adapt to the loads under which it is placed. [1]
Comparative anatomy has long served as evidence for evolution, now joined in that role by comparative genomics; [10] it indicates that organisms share a common ancestor. It also assists scientists in classifying organisms based on similar characteristics of their anatomical structures.