The sarcomere is the contractile unit of a muscle fiber.
PENIS!
The muscle that begins nearest the mid-line of the body and is located on a less movable part of the skeleton is referred to as the "origin" of the muscle. The origin typically attaches to a stable bone or structure, allowing the muscle to exert force effectively during movement. In contrast, the "insertion" of the muscle is usually found on the more movable part of the skeleton, allowing for greater mobility and movement.
What is the Orgin of a muscle, and the moveable part is the insertion
There are two points of attachment for a (skeletal) muscle, the origin and the insertion. The origin is the immovable (or slightly movable) part. The insertion moves towards the origin.
Origin is typically the proximal attachment of a muscle because it is the least moveable. The distal attachment is where a muscle inserts.
insertion
The immovable part of muscle bundles is called the origin. This point is where the muscle attaches to a stationary bone or structure, providing a stable anchor during muscle contraction. In contrast, the other end of the muscle, known as the insertion, attaches to a movable bone, allowing for movement when the muscle contracts.
The "movable" end of a muscle is called the insertion. The "immobile" end is called the origin. Shortening, or contraction, of a muscle causes the origin and insertion to become closer to one another.
origin is where the muscle stars (generally the proximal attachment or in some cases medial) insertions is where the muscle ends (generally the distal or lateral attachment) for example the origin of the bicep would be the shoulder while the insertion is the elbow
Insertion point, which most probably is a tendon.
Insertion
INSERTION