Chapt 10 Muscle Skeltal Flashcards
What is the role of the calcium ions in the contraction of skeletal muscle
Calcium ions buying to the troponin tropomyosin complex and remove there inhibitory action on actin/ myosin interaction
What is the functional unit of a skeletal muscle fiber
Sarcomere
Interactions between thin and thick myofilaments of the sarcomere are responsible for what
Muscle contraction
During muscle contraction all of the following occur except
Calcium concentrations in the sarcoplasm decrease
Bring a muscle contraction of muscle fibers shorten when?
Thin myofilaments are pulled toward the center of the sarcomere by pivoting of the myosin heads
The elaborate network of membranes in skeletal muscle cells that function and calcium storage is the?
Sarcoplasmic reticulum
What is the function of the T tubules
They conduct action potentials from the sarcolemma to the interior of the muscle
One transverse tubule plus adjacent terminal cistarne form a ?
Triad
Which ion links excitation to contraction in a skeletal muscle fiber
Calcium
As action potentials travel down a t tubule, a voltage sensitive protein changes shape. This shape change opens a ?
Calcium release channel
As a axon enters a muscle it branches into a number of Erickson terminals each of which made contact with the single muscle fiber. The Portion on the sarcolemma in in contact with the Axon terminals is called the
Motor end plate
at the neuromuscular junction calcium ions out to?
Release synaptic vesicles from the axon terminal
The first thing that releases when the axon terminal releases ach is?
Diffusion across the synaptic cleft
What type of ion channel opens in response to a action potential arriving at the axon terminal?
Voltage gated calcium
What’s the name of the enzyme that degrades ach
Acetylocholeineterasw
