Skeletal Muscle Tissue

Thin Actin Filament

• Actin filaments are rigid structures that do not change shape.
• Actin filaments are primarily involved in DNA replication.
• Actin filaments are thin protein fibers that play a crucial role in cellular structure and movement.
• Actin filaments are thick protein fibers that inhibit cellular movement.

Thick Myosin Filament

• Thick myosin filament is responsible for oxygen transport.
• Thick myosin filament is a key protein in muscle contraction.
• Thick myosin filament is a type of carbohydrate.
• Thick myosin filament is involved in nerve signal transmission.

What is Sarcomere?

• A type of muscle fiber found in smooth muscle.
• The basic unit of muscle contraction in striated muscle.
• The smallest unit of bone structure.
• A type of connective tissue in the body.

What is "I Band" in the sarcomere?

• The I Band is the area where both thick and thin filaments overlap.
• The I Band is the central part of the sarcomere that appears darker under a microscope.
• The I Band is the region in a sarcomere that contains only thick filaments (myosin).
• The I Band is the region in a sarcomere that contains only thin filaments (actin) and is lighter in appearance.

What is "A band" in sarcomere?

• The A band is the light region in a sarcomere that contains only thin filaments.
• The A band is a region that contains only elastic filaments.
• The A band is the area where muscle fibers are connected to the nervous system.
• The A band is the dark region in a sarcomere that contains thick filaments (myosin) and overlaps with thin filaments (actin).

What is "H zone" in sarcomere?

• The H zone is where thin filaments are located.
• The H zone is the area in the sarcomere that contains only thick filaments and no thin filaments.
• The H zone is the region that connects the Z lines in the sarcomere.
• The H zone is the area in the sarcomere that contains both thick and thin filaments.

What is "M line" in sarcomere?

• The M line is where thin filaments are anchored.
• The M line is the boundary between adjacent sarcomeres.
• The M line is responsible for muscle contraction.
• The M line is the central line in a sarcomere that anchors thick filaments.

What is "Z disc" in sarcomere?

• The Z disc is a type of muscle fiber.
• The Z disc is where ATP is produced.
• The Z disc connects to the nucleus of the muscle cell.
• The Z disc is the boundary of a sarcomere that anchors thin filaments.

What is step 1 of "Muscle Contraction"?

• Binding of myosin heads to actin filaments.
• Release of ATP from the muscle fibers.
• Influx of sodium ions into the muscle cell.
• Release of calcium ions from the sarcoplasmic reticulum.

What is the 2nd step of "Muscle Contraction"?

• Calcium ions bind to troponin.
• Sodium ions are pumped into the muscle cell.
• ATP is released from the muscle fiber.
• Myosin heads detach from actin.