The first class lever is the most common lever in the human body. True/False
Answer:
False
Explanation:
In first-class levers, the position of the fulcrum is between the effort and the load. In these levers such as scissors, if the effort (child) is farther from the fulcrum than the load, a heavy load can be moved. There are few first-class levers in the human body.
One of the examples of such a lever is the head resting on the vertebral column. When the head is raised, the contraction of the posterior neck muscles provides the effort and the fulcrum is formed by the joint between the atlas and the occipital bone. Third class levers are the most common types present in the human body.
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<u>The difference between dog and horse teeth are as follows:</u>
- The dental formula of dog is 2 (I3/I3, C1/C1, P4/P4, M2/M3), whereas for the horse it is 2 (I3/I3, C1/C1, P4/P4, M3/M3).
- The total number of teeth in the dog is 42, whereas in the case of the horse it ranges from 40 to 42.
- In the the dog, upper jaw has 2 molar teeth, whereas in the case of the horse, the upper jaw has 3 molar teeth.
<u>The similarities between dog and horse teeth are as follows:</u>
- The most notable similarity in the case of both the animals is that they have the same number of Incisor, Canine, and Premolar in the order of 3, 1, and 4 respectively.