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Graphic Design. Information Security. Information Technology. Management Information Systems. Culinary Arts. Art History. Other Fine Arts. Cultural Literacy. Knowledge Rehab. National Capitals. People You Should Know. Sports Trivia. Flashcards in Chapter 10 Part 6 multiple choice Deck Loading flashcards Which type of lever is demonstrated by using scissors?
A a second-class lever B a first-class lever C a third-class lever D a fourth-class lever. B a first-class lever. What muscle is primarily responsible for preventing foot drop?
A extensor hallucis longus B fibularis tertius C extensor digitorum longus D tibialis anterior. C extensor digitorum longus. What is the major factor controlling how levers work? A the weight of the load B the direction the load is being moved C the difference in the positioning of the effort, load, and fulcrum D the structural characteristics of the muscles of the person using the lever.
C the difference in the positioning of the effort, load, and fulcrum. Which of the following is not a muscle primarily involved in the breathing process? A external intercostal B internal intercostal C latissimus dorsi D diaphragm. What is the main factor that determines the power of a muscle? A the total number of muscle cells available for contraction B the number of neurons innervating it C the shape D the length. A the total number of muscle cells available for contraction.
What is a muscle that provides the major force for producing a specific movement called? A a synergist B a fixator C an agonist D an antagonist. A The muscle has two, three, or four functions, respectively. B The muscle has two, three, or four insertions, respectively. C The muscle is able to change direction twice, three times, or four times faster than other muscles, respectively.
D The muscle has two, three, or four origins, respectively. A quadriceps femoris B gluteus maximus C rectus abdominis D gastrocnemius.
A quadriceps femoris. The names of muscles often indicate the action of the muscle. What does the term levator mean? A The muscle elevates B The muscle flexes and rotates a region. C The muscle is a fixator and stabilizes a bone or joint. D The muscle functions as a synergist. A The muscle elevates. Which of the following describes the suprahyoid muscles?
A They are a group of muscles that lie superior to the hyoid bone and help form the floor of the oral cavity. B They move the pharynx superiorly during swallowing. C They depress the larynx and hyoid bone if the mandible is fixed. D They are often called strap muscles.
A They are a group of muscles that lie superior to the hyoid bone. The supraspinatus is named for its location on the posterior aspect of the scapula above the spine. What is its action?
A to extend and medially rotate the humerus and to act as a synergist of the latissimus dorsi B to help hold the head of the humerus in the glenoid cavity and rotate the humerus laterally C to stabilize the shoulder joint and help prevent downward location of the humerus and to assist in abduction D to flex and adduct the humerus and to act as a synergist of the pectoralis major. C to stabilize the shoulder joint and help prevent downward location of the humerus and to assist in abduction.
Which of the following muscles is not a rotator cuff muscle? A teres minor B levator scapulae C supraspinatus D subscapularis. Which of the following muscles is involved in producing horizontal wrinkles in the forehead?
A the zygomaticus major B the frontal belly of the epicranius C the temporalis D the medial pterygoid. B the frontal belly of the epicranius. A cute, little curly-haired child is sitting behind you in church.
You turn around for a moment and she sticks her tongue out at you. Which tongue muscle did she use? A hyoglossus B orbicularis oris C genioglossus D stylohyoid. Which group of muscles flexes and rotates the neck? A the splenius B the spinalis C the scalenes D the iliocostalis. The neck muscles provide the effort, the neck is the fulcrum, and the weight of the head is the load. With this class of lever, the force applied is in the middle, between the resistance and the axis of rotation R-F-A.
In a third-class lever, the most common in the human body, force is applied between the resistance weight and the axis fulcrum figure 1. Picture someone using a shovel to pick up an object. The effort force can be magnified or diminished depending on the position of the fulcrum between the effort and the load.
A Pair of Scissors is an example of a First Class lever Double lever The Fulcrum is the pivot in the middle and the Force is applied with your hand at the end.
The lever makes the work easier. The class of lever depends on the location of the load, force, and fulcrum. Some examples of levers include more than one class, such as a nut cracker, a stapler, nail clippers, ice tongs and tweezers.
Other levers, called single class levers include the claw end of a hammer. A wheelbarrow is a second-class lever. The effort always travels a greater distance and is less than the load. This arrangement results in a bigger effort arm to load arm ratio, making the second class lever the most mechanically advantageous.
There are many examples of third class lever systems, including both flexion and extension at the knee joint. During flexion at the knee, the point of insertion of the hamstrings on the tibia is the effort, the knee joint is the fulcrum and the weight of the leg is the load. With all muscles of the jaw working together it can close the teeth with a force as great as 55 pounds 25 kilograms on the incisors or pounds The uterus sits in the lower pelvic region.
There are three classes of lever system. Each lever system has the following components: lever, fulcrum, effort and load.
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