Functional Anatomy: Macro + Microstructure + SFT + FV + FL

In a sarcomere, what are the thick protein filaments known as?

• Cross Bridges

• Myosin

• Light Band

• Actin

What layer of connective tissue covers the muscle fiber?

• epimysium
• endomysium
• perimysium

In a sarcomere, which structure is attached to the Z-lines?

• Mysosin

• Actin

• A Band

• I Band

The contractile unit of a muscle is called the:

• sarcomere

• motor unit

• fascicle

• myofibril

A bundle of muscle fibres is known as a:

• sarcomere

• fiber

• fascicle

• Tendon

The thin filaments in a myofibril are:

• Sarcomeres

• Sarcoplasm

• Actin

• Myosin

What two chemicals are necessary for muscle contraction to occur?

• Niacin and Potassium
• Calcium and ATP
• Sodium and Potassium
• Ach and Potassium

Calcium:

• causes ATP to be broken down within the sarcomere

• is the stimulus for a power-stroke to occur

• energizes the myosin heads to be able to attach to the actine binding sites

• plays a vital role exposing the binding sites on actin so that the myosin heads can attach to them

A powerstroke in the sarcomere occurs directly after:

• Myosin crossbridges have binded onto actin binding sites

• The calcium had crossed into the cytoplasm

• The calcium has binded with troponin

• A nerve impulse has stimulated the release of calcium into the sarcomere

True or False: An isometric contraction has the capability to produce more force than both concentric and eccentric contractions.

• True

• False