Muscles Flashcards
name the 3 types of muscle
skeletal, smooth, cardiac
what is the structure of skeletal muscle
sarcomeres, multinucleated, striated, high energy requirements
what is the structure of cardiac muscle
striated, less linear, intermediate energy requirement
what is the structure of smooth muscle
mononucleic, require little energy
name the components of muscles from biggest to smallest.
muscle, fascicles, muscle fibres, myofibrils, thick and thin filaments
how long does and AP in a skeletal muscle last
1,2 ms before 100ms or more of mechanical action
describe the role of calcium in muscle contraction
when calcium binds to troponin it causes a change in the tertiary structure moving the tropomyosin from the myosin binding site
what is tension
the force a muscle exerts on a joint
what is the load
the force exerted on the muscle by an object
how do we get stronger
increase in motor unit recruitment, and firing frequency and an increase in muscle mass
what is hypertrophy
increase in muscle fibre size due to assertion of contricile proteins in the muscle cell
what is the load velocity relationship
in the absence of a load, a shortening contraction reaches its maximum shortening velocity when the load increases to the point where the muscle is not able to move it, then the contraction becomes isometric. when the load increases beyond the peak tension i becomes eccentric
what is the frequency tension relationship
look at graph
