Looks like no one added any tags here yet for you.
Skeletal Muscles
Long, cylindrical multinucleated cells with peripherally placed nuclei.
Peripherally
Nasa gilid ang nucleus.
Characteristics of the Muscle
Contractible
Extensible
Elastic
Contractible
Can shorten in length
Extensible
Can extend or stretch
Elastic
Can return to their original shape
Contraction Types
Voluntary
Involuntary
Voluntary Muscles
Movements that can be consciously controlled.
Examples of Voluntary Muscles
Skeletal muscles (e.g., moving your arms, legs, chewing during mastication).
Involuntary Muscles
Movements that cannot be consciously controlled.
Cardiac muscles (e.g., heartbeats), smooth muscles (e.g., muscles in the digestive tract).
Examples Involuntary Muscles
Skeletal muscle fibers
Arranged into bundles called fascicles.
Four Different Connective Tissue Coverings
Deep fascia
Endomysium
Epimysium
Perimysium
[DEEP]
Deep fascia
Surrounds entire skeletal muscle and extends beyond its length. (Grayish structure all over our body).
Epimysium
Closely surrounds skeletal muscle, binds fascicles together.
Perimysium
Surrounds each fascicle.
Endomysium
Surrounds each muscle fiber (cell).
Tendon
Muscles that connect to the bone.
Sarcolemma
Skeletal muscle fibers
Myofibril
Thin filaments within muscle fiber.
Striated muscle
Muscle tissue that has a banded appearance due to the presence of repeating dark (A bands) and light (I bands) bands. This pattern is most commonly seen in skeletal and cardiac muscles.
Sarcomere
The basic functional unit of a myofibril and the fundamental unit of muscle contraction.
It is responsible for the muscle's ability to contract, with the interaction of actin and myosin filaments playing a significant role in this process.
Malaki ang participation sa contraction.
Myosin
Thick filament that acts as a motor by hydrolyzing adenosine triphosphate (ATP) to release energy.
Actin
The thin myofilaments have binding sites to which the heads of the thick myofilaments attach.
Skeletal Muscle Contraction
“All or none” response
Different Degree of Contraction
Changing the frequency of stimulation.
Changing the number of muscle cells stimulated to contract.
Tetanus
Puro contraction lang kaya nag la-lockjaw. Bacteria caused by: Clostridium tetani.