09 - Muscle Tissue: Sarcomere

Front

What is the I Zone/Band in a sarcomere?

Back

The I Zone/Band is the region of the sarcomere that contains only thin filaments (actin) and appears lighter under a microscope.

Front

What does the Z Line represent in a sarcomere?

Back

The Z Line is the boundary between adjacent sarcomeres and serves as the anchor point for thin filaments (actin).

Front

What are thin filaments in a myofibril primarily composed of?

Back

Thin filaments in a myofibril are primarily composed of actin.

Front

What is the H Zone in a sarcomere?

Back

The H Zone is the central region of the A Band where only thick filaments (myosin) are present, and no thin filaments overlap.

Front

What is the A Band in a sarcomere?

Back

The A Band is the dark band of the sarcomere that contains both thick (myosin) and thin (actin) filaments.

Front

What is the role of myosin in muscle contraction?

Back

Myosin is a motor protein that interacts with actin filaments to produce muscle contraction through the sliding filament mechanism.

Front

How do the I Band and A Band differ in a sarcomere?

Back

The I Band contains only thin filaments (actin) and is lighter, while the A Band contains both thick (myosin) and thin (actin) filaments and is darker.

Front

What happens to the H Zone during muscle contraction?

Back

During muscle contraction, the H Zone decreases in size as the thin filaments slide past the thick filaments.

Front

What is the significance of the sarcomere in muscle tissue?

Back

The sarcomere is the basic functional unit of muscle tissue, responsible for muscle contraction and relaxation.

Front

What is the structure of a sarcomere?

Back

A sarcomere is composed of thick filaments (myosin), thin filaments (actin), Z Lines, I Bands, A Bands, and H Zones.