Chapter 10 Homework
Calcium ions are released from the sarcoplasmic reticulum into the cytosol
at the beginning of a contraction.
Skeletal muscle contraction will continue to occur as long as the following chemicals are available in the cytosol of the muscle fiber.
calcium ions and ATP
Release of calcium from these structures triggers skeletal muscle contraction.
terminal cisterns of sarcoplasmic reticulum
What energizes the myosin head?
ATP hydrolysis reaction
What type of tendon is formed when the connective tissue elements of a skeletal muscle extend as a broad flat layer?
Aponeurosis
Which of the following correctly lists the sequence of structures that action potentials must move through to excite skeletal muscle contraction?
Axon of neuron, sarcolemma, T tubules
Which of the following regions of a sarcomere contain thin filaments?
Both I band and A band.
This is the outermost layer of connective tissue surrounding a skeletal muscle.
Epimysium
Which property of muscle gives it the ability to stretch without damage?
Extensibility
In an isometric contraction the muscle develops tension but does not
Lengthen
During muscle contraction by the sliding filament mechanism, thin filaments are pulled towards the
M Line
Which of the following consists of a somatic motor neuron and all the skeletal muscle fibers it stimulates?
Motor Unit
The contractile organelles of a skeletal muscle fiber are thread-like structures called
Myofibrils
Which of the following is NOT a major function of muscle tissue?
Production of vitamins.
What regulatory proteins can be found in the thin filaments of skeletal muscle fibers?
Tropomyosin and troponin
Myofibrils contain
contractile proteins. regulatory proteins. structural proteins.
Which of the following is a common effect of aging on skeletal muscle?
loss of muscle mass decrease in maximal strength a slowing of muscle reflexes loss of flexibility
The different types of muscle tissue differ from each other by
microscopic anatomy. location. type of Control. both microscopic anatomy and location
Cross bridges are formed during muscle contraction when _____ on the thick filaments binds to _____ on the thin filaments.
myosin; actin
This is the least powerful type of skeletal muscle fiber.
slow oxidative fiber