Muscular System

Front

Thin filaments are made of _____________.

Back

Actin

Front

What is the role of acetylcholinesterase (AChE)?

Back

To break down ACh and 'turn off' a stimulus.

Front

Which protein covers up the active sites of actin when a muscle is at rest?

Back

Tropomyosin

Front

Which of these refers to a section of sarcomere that is made up of only thin filaments?

Back

I band

Front

The neurotransmitter that carries an action potential from a neuron to the sarcolemma is _____________.

Back

Acetylcholine (ACh)

Front

What is the function of myosin in muscle contraction?

Back

Myosin interacts with actin to produce muscle contraction.

Front

Define sarcomere.

Back

The basic contractile unit of muscle tissue.

Front

What is the role of calcium ions in muscle contraction?

Back

Calcium ions bind to troponin, causing tropomyosin to move and expose active sites on actin.

Front

What is the difference between the A band and I band in a sarcomere?

Back

The A band contains both thick (myosin) and thin (actin) filaments, while the I band contains only thin filaments.

Front

What triggers the release of calcium ions from the sarcoplasmic reticulum?

Back

An action potential arriving at the neuromuscular junction.