PLTW New HBS 1.2

Front

What is the muscle that works against a contracting working muscle?

Back

Antagonist

Front

What initiates skeletal muscle contraction by sending a message to the muscle cell?

Back

Neuron

Front

Which protein do calcium ions bind to during muscle contraction?

Back

Troponin

Front

What is the organelle containing actin and myosin in muscle cells?

Back

Myofibril

Front

What are the thin filaments in a myofibril primarily made of?

Back

Actin

Front

Define 'Agonist' in the context of muscle movement.

Back

The muscle that contracts to produce a movement.

Front

What role does 'Tropomyosin' play in muscle contraction?

Back

It blocks the binding sites on actin filaments when the muscle is relaxed.

Front

What is the function of 'Sarcoplasmic Reticulum' in muscle cells?

Back

It stores and releases calcium ions during muscle contraction.

Front

Explain the term 'Sarcomere'.

Back

The basic contractile unit of muscle tissue, defined by the area between two Z lines.

Front

What is the role of 'Myosin' in muscle contraction?

Back

Myosin heads bind to actin filaments and pull them to shorten the muscle.