Horse 43 mph 70 kmh

B. Cheetah - 62 mph (99 km/h)
Kangaroo Locomotion

A. The horse has a stiffer spine, making it better suited for endurance. B. The cheetah is the fastest land mammal; flexibility in its spine allows for longer strides. C. The kangaroo has more upward movement with each leap, and does not move forward as quickly as the horse or cheetah. (Illustration by Patricia Ferrer)

A. The horse has a stiffer spine, making it better suited for endurance. B. The cheetah is the fastest land mammal; flexibility in its spine allows for longer strides. C. The kangaroo has more upward movement with each leap, and does not move forward as quickly as the horse or cheetah. (Illustration by Patricia Ferrer)

propels the animal in concert with undulation of the posterior vertebral column. The forelimbs are flippers used for maneuvering. The cervical vertebrae of completely aquatic mammals are short, and they have completely lost their pinnae.

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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