HBS 1.2.1-1.2.2 Romero

Front

What is a sarcomere?

Back

The contractile unit between two Z discs.

Front

What does the epimysium represent?

Back

Label A.

Front

What neurotransmitter signals muscle contraction?

Back

Ach (acetylcholine).

Front

Muscle Rule 1 states that muscles must cross at least 1 _______.

Back

Joint.

Front

Which proteins are regulatory proteins bound to actin?

Back

Troponin and tropomyosin.

Front

What is the function of myosin in muscle contraction?

Back

Myosin is a motor protein that interacts with actin to produce muscle contraction.

Front

What role does calcium play in muscle contraction?

Back

Calcium ions trigger the interaction between actin and myosin.

Front

Define the term 'actin'.

Back

Actin is a protein that forms the thin filaments in muscle fibers.

Front

What is the role of tropomyosin in muscle contraction?

Back

Tropomyosin blocks the binding sites on actin for myosin when the muscle is relaxed.

Front

What is the significance of Z discs in a sarcomere?

Back

Z discs define the boundaries of a sarcomere and anchor the thin filaments.