S&C Chapter 1

Front

Where is calcium released from during muscle contraction?

Back

Sarcoplasmic reticulum

Front

What is the main purpose of the myelin sheath?

Back

To speed up signal transmission

Front

What occurs during the relaxation phase of muscle action?

Back

Neural input stops and calcium is pumped out.

Front

Which skeleton includes the ribs?

Back

Axial

Front

What surrounds each muscle fiber?

Back

Sarcolemma

Front

Define the term 'sarcoplasm'.

Back

The cytoplasm of a muscle cell, containing myofibrils and other organelles.

Front

What is the role of myosin in muscle contraction?

Back

Myosin heads bind to actin filaments to facilitate muscle contraction.

Front

Explain the sliding filament theory.

Back

The theory that muscle contraction occurs when actin filaments slide over myosin filaments, shortening the muscle.

Front

What is the function of the neuromuscular junction?

Back

It is the synapse between a motor neuron and a muscle fiber, where neurotransmitters are released to initiate contraction.

Front

What is the significance of ATP in muscle contraction?

Back

ATP provides the energy required for muscle contraction and relaxation.