Consider the movements of plantar flexion and dorsiflexion. Propose a reason why there are far more (and stronger) muscles involved in plantar flexion?
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Consider the movements of plantar flexion and dorsiflexion. Propose a reason why there are far more (and stronger) muscles involved in plantar flexion?
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- Describe the roles of plantar flexion and dorsiflexion inwalking. What muscles produce these actions?What are two factors which allow the gastrocnemius and soleus muscles to generate greater plantar flexion torque than all the other muscles capable of plantarflexion?Consider only the effect of the brachioradialis muscle for these questions: If a weight is held in the hand and the forearm is flexed, whattype of lever system is in action? If the weight is placed on the forearm? Which system can lift more weight, and how far?
- Explain the role of agonist, antagonist, synergist, and fixator muscles. Give two examples of each.Distinguish between a synergist, antagonist, and fixator. Explain how each of these may affect the action of a prime mover.In the EMG experiment. the measured force came from the contraction of which muscles? Check all that apply. Check All That Apply flexor digitorum superficialis flexor pollicis longus flexor carpi ulnaris flexor carpi radialis palmaris longus
- If your biceps brachii muscle attaches to your forearm 2 inches below your elbow, the distance from the elbow to the palm of your hand is 18 inches, and you lift a 20 pound weight, how much pull must your muscle exert to achieve elbow flexion? If your biceps brachii muscle attaches to your forearm 2 inches below your elbow, the distance from the elbow to the palm of your hand is 18 inches, and you lift a 20 pound weight, how much pull must your muscle exert to achieve elbow flexion? hhhAn isometric exercise is one in which the joint angle does not change during the application of muscle force. For instance, you can join your hands together, pushing down with one hand and pushing up with the other. In each arm, the muscles that provide the force are connected to the bones of the arm by tendons. If you increase the forces but keep the angles the same, the muscles will still contract. Explain how this is possible.Discuss the functions of the different types of levers found in our body. How do these different types of levers make our body more useful. Explain each type of lever, the position of the fulcrum, load, and applied force and give an example of each.
- Which of the following statements is (are) true about lever systems?a. The effort is the origin of the muscle.b. The fulcrum is a joint.c. The resistance is between the effort and the fulcrum in a third-class lever.d. First-class levers are the most common in the human body.e. The quadriceps muscles use a third-class lever to extend the knee.With a laboratory partner, determine how and why maintaining full flexion of all the fingers is impossible when passively moving the wrist into maximal flexion. Is it also difficult to maintain maximal extension of all the finger joints while passively taking the wrist into full extension?You are trying to jump from a crouched position (knee fully flexed), 1) list all of the muscles at the knee and hip that would move you from this position to in the air. 2) using the principle of active insufficiency please also outline the timing of the muscle force for the knee and the hip (i.e. what muscles provide the most force early in the movement, when the knee and hip are both more flexed, and what muscles provide the most force later in the movement, when the hip and knee are both more extended)