Quizizz questions
Which of the following statements concerning the role of Ca2+ in the contraction of skeletal muscle is correct?
A rise in intracellular Ca2+allows myosin to interact with actin
Muscle fatigue sets in due to the nonavailability of
ATP
The thick filament is called what?
Myosin
Is skeletal muscle control considered voluntary or involuntary?
Voluntary
The neurotransmitter always used at the neuromuscular junction is:
acetylcholine
Which of the following is a component of a thin filament?
actin
The crossbridges involved in muscle contraction are located on the ________________.
myosin filaments
The functional unit of the contractile system in skeletal muscle is(are)
sarcomeres
Which of the following sets of ions are necessary in the chemical events of muscle contraction?
sodium and calcium
Into what does the neuron release its neurotransmitter at the neuromuscular junction?
synapse
Which of the following steps occurs last in this series?
the active site soon actin is exposed allowing myosin to bind
Which of the following occurs when a muscle contracts?
the distance between z-lines decreases
As I'm hiking through the woods, I come across a bear. Which nervous system will be firing inside my body?
Sympathetic
Which of these statements is correct regarding muscle contraction?
The crossbridges bind to the actin and shorten the sarcomeres
A motor unit is made up of _______________.
a motor neuron and the muscle fibers it innervates
Which of the following steps occurs first?
myosin heads attach to actin
The segment of a myofibril that is called a sarcomere runs from _______________.
one Z line to the next Z line
