Receptors that monitor stretch in the articular capsules that enclose synovial joints; they are proprioceptors, mechanoreceptors, and nociceptors; contains at least four receptor types (1) Lamellar Corpuscles, (2) Bulbous Corpuscles, (3) Free Nerve Endings, and (4) Receptors resembling Tendon Organs; together they provide information on joint position and motion.
Puffins are built for swimming underwater rather than for flying, and at the Alaska SeaLife Center in Seward, a mutli-level seabird display allows visitors to watch puffins and other sea birds dive to the bottom of the enclosure for food. When they dive, puffins flap their wings through the water, appearing to fly.
The willow ptarmigan was designated the official state bird of Alaska in 1955. There are three kinds of ptarmigan and all can be found in Alaska-the willow ptarmigan and rock ptarmigan (which are also found in Scandinavia, Russia, and northern Eurasia), and white-tailed ptarmigan (found only in North America).here are three kinds of ptarmigan and all can be found in Alaska-the willow ptarmigan and rock ptarmigan (which are also found in Scandinavia, Russia, and northern Eurasia), and white-tailed ptarmigan (found only in North America).