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Ch. 10- Skeletal Muscle Tissue
Exam #2- Anatomy
Terms in this set (40)
What structural similarities are shared by all muscle tissue? What are the unique functional properties of this tissue?
All muscle tissue contains the myofilaments actin and myosin, which generate contractile forces; the plasma membrane is called a sarcolemma; cytoplasm is called the sarcoplasm. Functional properties of muscle tissue are: contractility, excitability, extensibility, elasticity.
Which types of muscle tissue are striated? Which types are called visceral muscle? In which types are the muscle cells called fibers?
Cardiac muscle & Skeletal muscle. Cardiac muscle are called visceral muscle bc they occur in visceral organs/not voluntarily controlled. Skeletal & Smooth muscle cells are called muscle fibers.
Name the connective tissue that surrounds a fascicle.
What are the functional definitions of the origin & insertion of a muscle? In the limbs, what are the conventional definitions of a muscle's origin & insertion?
1) Origin- attachment site of the muscle that doesn't move when contracted. Insertion- attachment site on the bone that DOES move when contracted. 2) In the limbs, conventionally, the origin is more proximal attachment, insertion is located distally.
Place the following structures in order from smallest to largest, and define each.
1) Myofilament, sarcomere, myofibril, muscle fiber. 2) Myofilaments- composed of contractile proteins actin & myosin; In striated muscle, myofil. are arranged into sarcomeres- the smallest contractile unit in striated muscle. Myofibril- organelle within a muscle cell made up of repeated sarcomeres. Muscle Fiber- muscle cell.
Which myofilaments are found ONLY in the A band?
The thick (myosin) myofilaments are limited to the A band.
What are the functions of the terminal cristern and the T tubules?
Terminal cristern stores Calcium ions. T tubules carry the stimulus to contract from the surface sarcolemma to the deeper regions of the muscle fiber, initiating the release of calcium from the terminal cristern.
Why is overlap of the thin and thick filaments essential for muscle contraction?
The myosin heads must attach to the overlapping thin filament to generate a contractile force. If there's no overlap, the myosin heads have nothing to attach to.
Which region of the myofibril changes in length during contraction: the A band, the I band, or the Z disc?
Differentiate a neuromuscular junction from a motor unit.
The neuromuscular junction is the connection between a single terminal bouton and a muscle fiber. A motor unit is a single motor neuron and ALL of the muscle fibers it innervates.
The connective tissue that lies just outside the sarcolemma of an individual muscle cell is called the _________.
A fascicle is a _______.
a bundle of muscle cells enclosed by a connective tissue sheath.
Thick or thin?- Contains actin
Thick or thin?- Contains myosin heads
Thick or thin?- Contains myosin
Thick or thin?- does NOT lie in the H zone
Thick or thin?- does NOT lie in the I band
Thick or thin?- attaches to a Z disc
T/F? H band narrows when a skeletal muscle fiber contracts
T/F? A band narrows when a skeletal muscle fiber contracts
T/F? I band narrows when a skeletal muscle fiber contracts.
T/F? M line narrows when a skeletal muscle fiber contracts.
A _____ is a rod-shaped organelle; made of sarcomeres.
A _____ is an organ.
A _____ is a bundle of cells.
A ______ is a group of large molecules.
A _____ is a cell.
The function of T tubules in muscle contraction is to _________.
Transmit an impulse deep into the muscle cell.
Which fiber type would be the most useful in the leg muscles if a long-distance runner?
The ions that first enter a muscle cell when an impulse passes over its sarcolemma and then trigger muscle contraction are
Striated and involuntary
Striated and voluntary
not striated and involuntary
is present in wall of bladder
is located only in the heart
its fibers are giant, multinucleate cells
the individual muscle cells are called muscle fibers
skeletal AND smooth muscle
has no A or I Bands
located in the walls of hollow organs
Its extranuclear Materials are called sarcoplasm instead of cytoplasm, and the plasma membrane is called the sarcolemma
Skeletal, Cardiac, and Smooth muscle. all 3 types
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