24/25 - U3L3 Muscle Contractions Flashcard Review

Front

What is the role of myosin in muscle contraction?

Back

Myosin pulls on actin to cause muscle contraction.

Front

What ion is responsible for changing the conformation of tropomyosin?

Back

Calcium.

Front

Where is calcium stored in muscle cells?

Back

In the Sarcoplasmic Reticulum (SR).

Front

In a bicep curl, which muscle is the agonist?

Back

The biceps are the agonist.

Front

In a bicep curl, which muscle is the antagonist?

Back

The triceps are the antagonist.

Front

What is the agonist muscle during knee flexion?

Back

The hamstrings.

Front

What is the antagonist muscle during knee flexion?

Back

The quadriceps.

Front

Define 'agonist' in muscle movement.

Back

An agonist is a muscle that contracts to produce a movement.

Front

Define 'antagonist' in muscle movement.

Back

An antagonist is a muscle that opposes the action of the agonist.

Front

What is the function of tropomyosin in muscle contraction?

Back

Tropomyosin blocks the binding sites on actin, preventing contraction until calcium is present.