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Seals also have about twice as much blood as humans when body size is considered, and their blood can carry about three times the amount of oxygen as human blood. Not only do seals use hemoglobin, the oxygen-carrying molecules in human blood, they also have a second molecule in their muscle tissue called myoglobin that also carries oxygen.
The Seal has short, thick fur, grows to be up to 6.5 feet (2 metres) long and can weigh up to 375 pounds (170 kilograms). The whiskers (called vibrissae) help the seals sense of touch. The nostrils are closed in the resting state. Blubber is a thick layer of vascular fat found under the skin of all cetaceans, pinnipeds and sirenians.
Furthermore, seals have a relatively large blood volume (1.5 – 2 times that of terrestrial mammals). Shutting down the blood supply to non-essential organs and the slowing of the heart rate by one third (or even one tenth) also increases the efficiency of oxygen utilization.
A diving seal uses oxygen with great efficiency. Seals have about twice as much blood per unit of volume as humans (in seals, blood takes up 12% of the total body weight; in humans, it takes up 7%). Blood carries oxygen from the lungs to other body tissues, so the high volume of blood in a seal makes it an efficient transporter of oxygen.
Vibrissae (whiskers) grow from the thick pads of a seal's upper lip and cheeks. Vibrissae are attached to muscles and are supplied with blood and nerves. Vibrissae continually grow throughout a seal's life. Tail. A harbor seal has a short, flattened tail - tucked between its hind flippers. Hair. Harbor seals have thick, short hair.
Weight: 99 – 7100 lb (45 – 3200 kg) The Baikal seal is the smallest at 3ft and 99lbs, while the male Southern Elephant seal is the largest, measuring 16ft and 7100lbs. Flippers: All seals have four fin-like appendages called flippers, which help them move on land and sea. Seals and walruses have shorter flippers, while sea lions have longer ...
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Feb 9, 2023 · Seals are mammals and, as such, belong to the Mammalian class along with over 6,000 other species. Within the class Mammalia, there are 26 different orders, of which seals fall into the order Carnivora, which also includes wolves, bears, hyenas, and dogs. Seals have their own sub-order, pinnipeds, but are divided into different families based ...
