Concept explainers
a.
To determine: The force that the bicep would generate when the distance of the fulcrum from the arm is 4 cm and the angle at which the arm must be held constant is 90°.
Introduction: The contraction and relaxation of the muscle cells are responsible for the movement of a particular part of the body. The amount of pressure generated depends on the number of sarcomere units that slide over. Greater the force required, more will be the muscle fibers that slide over one another.
To compare: The force needed when the point of insertion is 5 cm from the fulcrum to the force obtained when the distance of the fulcrum from the arm is 4 cm.
Introduction: The movement of the body is controlled by the contraction and relaxation of the skeletal muscles. A unit of muscle cells that undergoes contraction and relaxation is called sarcomere. The sarcomere is responsible for providing a striated appearance
b.
To determine: The force generated by the bicep when a band weighing 7kg is added on to the risk.
Introduction: Contraction in the muscle is important during weightlifting and the amount of force generated depends on the numbers of sarcomere units that slide over one another. Greater the force more will be the muscle fibers required that slide over one another.
To Compare: The force generated by the bicep when a band weighing 7kg is added on to the risk with the force if the object is placed 25cm away from the fulcrum.
Introduction: The force required to lift an object is directly proportional to the distance of the weight from the fulcrum and it is also dependent angle at which the weight has to be made stable.
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HUMAN PHYSIOLOGY: AN INTEG ACCESS C
- Look at the elbow joint x-ray. Why is 90° the optimal joint angle for biceps activation? What would happen during flexion/extension? Explain in detail !arrow_forwardUtilize the attached picture. She leads with her right leg. A. What motion is occurring in the left knee from A to B? B. What muscles are acting on the right knee from A to B? C. How is the knee musculature acting on the left knee from B to C? D. What plane of of motion is the exercise occurring in (lower extremity only)? E. What muscles are acting on the left knee joint from A to B? F. How is the right ankle musculature acting from A to B?arrow_forwardUsing the picture, describe which muscle (supraspinatus or deltoid) has a mechanical advantage for creating abduction of the arm at the shoulder. Be sure to use the following terms in your response: axis, point of force application, and lever arm. Supraspinatus Middle deltoidarrow_forward
- An 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.arrow_forwardMuscles work in groups when they perform multifaceted movements. Write the anatomical term that describes the muscle of a compartment that performs the following action. 1. M uscle that is opposing an action 2. Muscle that stabilizes the origin of a prime mover 3. Small muscle that aids prime mover 4. Prime mover. Muscle that is causing an actionarrow_forwardTo do Left hip adduction (A4) in the Frontal plane, the ( name the muscle ) would have to lie (A – Where?) relative to the joint, and since it can only (PULL ), the fibers would have to run (PERPENDICULAR) to the (D ) axis to achieve the desired movement. choose from: A. Pick from: Anterior, Posterior, Medial, Lateral, Superior, Inferior B. Write in the word “PULL” C. Write “perpendicular” D. Pick from :Anterior - posterior, Superior-inferior or Medio - Lateralarrow_forward
- You are observing a doctor performing the ballard scoring. As a student nurse you know that if the doctor bilaterally flex the elbows up hold about 5 seconds, then extend arms down next to side and release then observe elbow angle and movement pull back of the arm is of which neuromuscular maturity? a. Square window b. Scarf sign c. Popliteal angle d. Arm recoilarrow_forwardLook at the elbow joint x-ray. Why is 90° the optimal joint angle for biceps activation? What would happen during flexion/extension?arrow_forwardDescribe the following terms Muscle Insertion Agonist Antagonist Synergist Abductorarrow_forward
- Why can you lift a larger load when your elbow is slightly flexed and your biceps muscle is at an intermediate length than you can when your elbow is fully extended?arrow_forwardIn 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 longusarrow_forwardLook at the elbow joint x-ray. Why is 90° the optimal joint angle for biceps activation? What would happen during flexion and extension?arrow_forward
- Human Physiology: From Cells to Systems (MindTap ...BiologyISBN:9781285866932Author:Lauralee SherwoodPublisher:Cengage Learning