Muscle

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Muscle
a. Type of muscle
There are three types of muscle in the body. Label figure 15 -15 as you read the
following descriptions of the various types of muscle:
1. Striated muscle, also called voluntary or skeletal muscles, are the muscle
fibers which move all bones, as well as the face and eyes. We have conscious
control over the activity of this type of muscle. Striated muscle fibers (cells)
have a pattern of dark and light bands, or fibrils, in their cytoplasm. A
delicate membrane called a sarcolemma surrounds each skeletal muscle fiber
2. Smooth muscle, also called involuntary or visceral muscle, are those muscle
fibers which move our internal organs such as the digestive tract, blood
vessels, and secretory duct leading from glands. We have no conscious
control over these muscles. They are called “smooth” because they have no
dark and light fibrils in their cytoplasm. While skeletal muscle fibers are
arranged in bundles. Smooth muscle forms sheets of fibers as it wraps around
tubes and vessels.
3. Cardiac muscle is striated in appearance but like smooth muscle in its action.
Its movement cannot be consciously controlled. The fibers of cardiac muscle
are branching fibers and are found in the heart.

OTOT
Jenis-jenis Otot
Ada tiga jenis otot dalam tubuh. Label angka 15 -15 saat Anda membaca uraian
berikut dari berbagai jenis otot:
1. Striated otot, juga disebut otot sadar atau otot rangka, adalah serat otot yang
menggerakkan semua tulang, serta wajah dan mata. Kita dapat mengontrol dengan
sadar aktivitas otot jenis ini. Serat otot lurik (sel) memiliki pola pita gelap dan
terang, atau fibril, dalam sitoplasma mereka. Sebuah membran halus yang disebut
sarcolemma mengelilingi setiap serat otot rangka
2. Otot polos, juga disebut tak sadar atau otot visceral, merupakan serat otot yang
menggerakan organ internal kita seperti saluran pencernaan, pembuluh darah, dan
saluran sekretori yang penting dari kelenjar. Kita tidak memiliki kontrol sadar atas
otot-otot ini. Mereka disebut "halus" karena mereka tidak memiliki fibril gelap dan
terang dalam sitoplasma mereka. Sementara serat otot rangka tersusun dalam
ikatan-ikatan. Otot polos membentuk lembaran serat seperti membungkus di sekitar
pipa dan saluran.

3. Jantung otot merupakan otot lurik dalam bentuknya tetapi cara kerjanya seperti
otot polos . Gerakan yang tidak dapat dikendalikan secara sadar. Serat-serat otot
jantung merupakan serat yang bercabang dan ditemukan di dalam jantung.

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