It is controlled by two muscles, the biceps on the front of the upper arm, and the triceps on the back of the upper arm. The biceps and the triceps are antagonistic muscles. This is when the biceps muscle contracts, the forearm moves up and when the triceps muscle contracts, the forearm moves down. Synergist: The synergist in a movement is the muscle’s that stabilises a joint around which movement is occurring, which in turn helps the agonist function effectively. Synergist muscles also help to create the movement.
Joints and movement - muscles bring about movement at a joint - muscles can only pull they cannot push so two muscles are needed to move a bone back and forth. - a pair of muscles like these are called antagonistic. - a muscle that contracts to cause extension of a joint is called an extensor - a flexor contracts to reverse the movement - the hip, knee and ankle joints are examples of synovial joints - the bones that move in the joint are separated by a cavity filled with synovial fluid. - the bones are held in position by ligaments that control and restrict movement. -tendons attach muscles to the bones - cartilage protects bones within joints.
Module 06 Case Study: Articulations and Nerve Tissue Part I— “Jill” Questions 1. What is the difference between a tendon and ligament? (1 point) Tendons bind muscle to bone, and ligaments bind bone to bone. A sprain is an extended and/or torn ligament, the band of connective tissue that connects the end of one bone with another bone. Ligaments support and stabalize the an individuals joints.
Independent Variable. muscle movement 3. Controlled Variables. total number of motor units present in muscle; subject’s physical condition Recruitment during isometric contractions 1. Dependent Variable.
• Be sure you know the root words and their meanings • Name and describe the three connective tissue layers found in a muscle: These layers allow parts to move on their own and also provide and area for blood vessels and nerves to move through. o Epimysium: The epimysium closely surrounds skeletal muscles. o Perimysium: This connective tissue divides muscle tissue into little segments. o Endomysium: This is a thin covering that houses bundles of muscle fibers called fascicles. • Define: antagonist, synergist, prime mover o Synergist: a muscle that assists the action of a prime mover o Antagonist: A muscle that act in opposition to a prime mover o Prime Mover: muscle primarily responsible for producing an action • List the various ways that muscles are named.
To use a lever, a person rests it on a support, the fulcrum, which is placed near the lower end of the lever and inserts it under the object to be lifted. The person pushes down on the upper end of the bar, the bar pivots on the fulcrum and the lower end is forced up. There are three classes of levers; class 1, class 2, and class 3. The trebuchet lever is a class 1 lever. A class 1 lever uses a fulcrum which is off center to
| | | |The protein ___myosin____consists of two twisted strands with globular cross-bridges projected outward along the strands. | |__actin___ is a globular protein with myosin binding sites. What two proteins are associated with it? Troponin and tropomyosin | |According to the sliding filament theory of muscle contraction, if allowed to, the myosin crossbridge attaches to the binding site on the actin filament | |and bends, pulling on the actin filament; it then releases and attaches to the next binding site on the actin, pulling again. What is preventing this from| |happening continuously?