Anatomy and Physiology I - Muscle Contraction and Lever Systems

Flashcards covering key concepts about muscle contraction, lever systems, and muscle anatomy.

What is the physics of muscle contraction related to?

It is related to the lever system where movement is achieved by pulling on bone.

What acts as the fulcrum in the lever system?

Joints act as the fulcrum for the lever.

In a first-class lever, where is the fulcrum located?

The fulcrum is located between the effort and the resistance.

What is a characteristic of a second-class lever?

In a second-class lever, the resistance is located between the effort and the fulcrum.

Describe a third-class lever.

In a third-class lever, the effort is located between the fulcrum and the resistance.

What are the three classes of levers in relation to muscle movement?

1. First-class lever: EFR; 2. Second-class lever: FRE; 3. Third-class lever: FER.

What is the role of an agonist in muscle action?

An agonist is the primary muscle that is responsible for movement.

What is a fixator muscle?

A fixator muscle helps stabilize the origin of the agonist muscle.

What are the three layers of connective tissues that muscles have?

1. Epimysium; 2. Perimysium; 3. Endomysium.

How are muscle fibers organized in terms of fascicles?

Each muscle consists of approximately 100 fascicles, and each fascicle contains about 100 muscle fibers.