Neuromuscular System

What is the first thing that must happen for a muscle to contract?

• Actin and Myosin slide past each other

• Calcium ions are released

• Action potential or a stimulus reaches a muscle fiber

___________ are long bundles of axons that transmit signals from the CNS the neuromuscular system allowing involuntary and voluntary muscle movement.

• Sarcomeres

• Nerves

• Dendrites

• Cell body

The property of all muscles that can be defined as the muscle tissue having a electric gradient which can reverse when stimulated is?

• Excitability

• Contraction

• Elongate

The property of all muscles that can be defined as the muscle tissue having the ability to contract or shorten is?

• Excitability

• Contraction

• Elongate

A motor unit is composed of:

• 1 motor neuron and many muscle fibers

• 1 muscle fiber and many motor neurons

• It depends on the type of muscle

• Several motor neuron pools

The type of muscle that is voluntary and is composed of muscle fibers that are bound together in parallel bundles and that is usually described as striated is called?

• Smooth

• Skeletal

• Cardiac

Skeletal muscles consist of numerous _____________ that contain a bundle of _______________ which are composed of repeating contractile units called _____________?

• muscle fibers, sarcomeres, myofibrils

• sarcomeres, muscle fibers, myofibrils

• sarcomeres, myofibrils, muscle fibers

• muscle fibers, myofibrils, sarcomeres

The thin filament composed of protein in a myofibril is called?

• Actin

• Myosin

The second step in a muscle contraction is?

• Actin and Myosin slide past eachother

• Calcium ions are released

• Action potential or a stimulus reaches a muscle fiber

The third step of muscle contraction is?

• Actin an Myosin slide past eachother

• Calcium ion is released

• Action potential or a stimulus reaches a muscle fiber