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