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A sarcomere is defined as the segment between two neighbouring Z-lines (or Z-discs). In electron micrographs of cross-striated muscle, the Z-line (from the German "zwischen" meaning between) appears in between the I-bands as a dark line that anchors the actin myofilaments. Surrounding the Z-line is the region of the I-band (for isotropic ).
Intercalated discs are complex structures that connect adjacent cardiac muscle cells. The three types of cell junction recognised as making up an intercalated disc are desmosomes, fascia adherens junctions, and gap junctions. [2] Fascia adherens are anchoring sites for actin, and connect to the closest sarcomere. [3]
Skeletal muscle, with myofibrils labeled at upper right. A myofibril (also known as a muscle fibril or sarcostyle) [1] is a basic rod-like organelle of a muscle cell. [2] Skeletal muscles are composed of long, tubular cells known as muscle fibers, and these cells contain many chains of myofibrils. [3] Each myofibril has a diameter of 1–2 ...
The soreness happens when vaccines or medications are injected into muscle tissue. To help reduce pain and discomfort, many medical professionals prefer to use a technique called the Z-track method.
Z-track injections can be performed at any intramuscular injection location, though the thigh and buttocks are the most common sites. Thigh (vastus lateralis muscle): Divide the upper thigh in thirds.
The primary job of muscles is to move the bones of the skeleton, but muscles also enable the heart to beat and constitute the walls of other vital hollow organs. There are three types of muscle ...
Myofilament. Myofilaments are the three protein filaments of myofibrils in muscle cells. The main proteins involved are myosin, actin, and titin. Myosin and actin are the contractile proteins and titin is an elastic protein. The myofilaments act together in muscle contraction, and in order of size are a thick one of mostly myosin, a thin one of ...
Gastrocnemius (calf muscle): One of the large muscles of the leg, it connects to the heel. It flexes and extends the foot, ankle, and knee. Soleus: This muscle extends from the back of the knee to ...