Sliding Filament Theory

Front

What is the Sliding Filament Theory?

Back

The Sliding Filament Theory explains how muscles contract by the sliding of actin and myosin filaments past each other, leading to muscle shortening.

Front

What is ATP and its role in muscle contraction?

Back

ATP (Adenosine Triphosphate) is the energy currency of the cell, providing the energy required for muscle contractions.

Front

Define muscle fiber.

Back

A muscle fiber is a single muscle cell that is capable of contraction.

Front

What are Troponin and Tropomyosin?

Back

Troponin and Tropomyosin are regulatory proteins that control the interaction between actin and myosin by covering the myosin-binding sites on actin.

Front

What is a crossbridge in muscle contraction?

Back

A crossbridge is the connection formed when myosin heads bind to actin filaments during muscle contraction.

Front

What is the role of calcium in muscle contraction?

Back

Calcium ions are essential for muscle contraction as they bind to troponin, causing a conformational change that allows myosin to bind to actin.

Front

What is a sarcomere?

Back

A sarcomere is the basic structural and functional unit of a muscle fiber, defined as the segment between two Z lines.

Front

What are myosin filaments?

Back

Myosin filaments are thick filaments in muscle fibers that interact with actin filaments to produce muscle contraction.

Front

What is the function of the sarcolemma?

Back

The sarcolemma is the cell membrane of a muscle fiber, responsible for conducting electrical impulses that trigger muscle contraction.

Front

Explain the role of ATP in the crossbridge cycle.

Back

ATP binds to myosin, causing it to detach from actin, and is then hydrolyzed to provide energy for the next contraction cycle.