Muscular system Julianna Soto Period 2 (Disorders (Myopathy (Disease of…
Muscular system Julianna Soto Period 2
Muscles , location and actions.
The biceps brachii flexes the forearm, whereas the triceps brachii extends it.
muscle fascicles ; straight femur
Flexor carpi radialis
flex the fingers and the hand at the wrist
Decreasing the angle between two bones
Movement in a circular or cone-shaped motion
Functions of muscular system
involuntary cardiac and smooth muscles helps heart beat and blood flow through body by producing electrical impulses
diaphragm is the main muscle
consists of no oxygen
consists of oxygen
skeletal muscles are responsible for the movements
Smooth and skeletal muscles make up the urinary system
skeletal muscles in core helps protect spine and help with stability
3 types of muscle tissue and functions
forms organs such as the stomach and bladder changes to shape and facilitate bodily functions
found in the walls of hollow organs throughout the body.
moves bones and other structures.
contracts the heart to pump blood.
found only in the myocardium, contracts in response to signals from the cardiac conduction system to make the heart beat.
Body movement and terminology
muscle that opposes,reverse can cause to stretch or remain relaxed; helps regulate the action of prime mover
one or more; helps prime movers by adding a little extra force or by reducing undesirable movement
Major muscle, which fleshes out the anterior chests and inserts on the humerus
Organization levels and structure
contractile elements,occupy most of muscle cell volume and composed of sarcomeres end to end.
contractile unit, composed of myofilaments made up of proteins
elongated multi nucleate cell;banded (striated) appearance
surrounded by endomysium
Myofilament or filament
thick and thin filaments; thick are bundled myosin molecules;thin filaments contain actin molecules.
discrete bundle of muscle cells, segregated from the rest of the muscle by the connective sheath
surrounded by perimysium
hundreds of thousands of muscle cells;connective tissue wrapping,blood vessels and nerve fibers
covered externally by the epimysium
Muscle fiber excitation
EPP triggers action potential that travels across the entire sarcolemma
Excitation contraction coupling
ATP tubules cause release of Ca which triggers contraction.
Events at the neuromuscular junction
motor neuron releases ACh that stimulates the skeletal muscle fiber causing depolarization.
cross bridge cycling
Muscle contracts that cause myofilaments to slide relative to each other
Disease of muscle
gradual reduction in muscle mass
Myofascial pain syndrome
pain caused by tightened band or striated postural muscles
pulled muscle (overuse,abused)
muscle pain resulting from any muscle disorder
sustained contraction of muscle
chronic inflammation of muscles