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Exam 3

Anatomy & Pysiology Exam 3

Serves as the actual trigger for muscle contraction by removing the inhibition of the troponin Calcium ions
A neurotransmitter released at motor end plates by the axon terminals Acetylcholine
Diffusion across the cell membrane results in depolarization Sodium-potassium ions
That is the role of tropomyosin in skeletal muscle? Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules.
Excitation-contraction coupling requires which of the following substances? Ca2+ and ATP
What structure in skeletal muscle cells functions in calcium storage? Sarcoplasmic reticulum
Immediately following the arrival of the stimulus at a skeletal muscle cell there is a short period called the _______ period during which the events of excitation-contraction coupling occur latent
What produces the striation of a skeletal muscle? the arrangement of myofilaments
Which of the following are composed of myosin? thick filaments
During muscle contraction, myosin cross bridges attach to which active sites? actin filaments
What is the functional unit of a skeletal muscle called? a sarcomere
What is the functional role of the T tubules? allows actin potential to travel from sarcolemma into sarcoplasmic reticulum
The muscle cell membrane is called the _____ sarcolemma
Muscle tissue has all of the following properties except ______ secretion
Which of the following statements is true? Striated muscle cells are long and cylindrical with many nuclei
What is the most distinguishing characteristic of muscle tissue? the ability to transform chemical energy into mechanical energy
The muscle cannot respond to a second stimulus, no matter how strong Absolute refractory period
The interior of the cell becomes less negative due to an influx of sodium ions Depolarization
The specific period during which potassium ions diffuse out of the muscle fiber due to a change in membrane permeability Repolarization
Also called a muscle stimulation transmitted by axons Action potential
An exceptionally strong stimulus can trigger a response Relative refractory period
An impulse from one nerve cell is communicated to a muscle fiber via the _____ synapse
What is the role of acetylcholinesterase? Destroy ACh o brief period after its release by the axon endings
Compare and contrast skeletal, cardiac and smooth muscle Skeletal- striated, voluntary Cardiac- involuntary, striated, found in heart Smooth- voluntary, not striated, hollow organs
A fibrous joint that is a peg in socket called a ____ joint Gomphosis
Articular cartilage found at the ends of the long bones serves to provide a smooth surface at the ends of synovial joints
On the basis of structural classification, which joint is fibrous connective tissue? syndesmosis
Connective tissue sacs lined with synovial membranes that act as cushions in places where friction develops are called _____ bursae
Articulations permitting only slight degrees of movement are ____ amphiarthroses
_______ are cartilaginous joints Synchondroses
Bending your head back until it hurts is an example of ____ hyperextension
In the classification of joints, which of the following are true? All synovial joints are freely movable
Synarthrotic joints _____ permit essentially no movement
Synovial fluid is present in joint cavities of freely movable joints. Which of the following statements is true about synovial fluid? It contains hyaluronic acid
What is moving a limb away from the median plane of the body along the frontal plane called? abduction
The terms inversion and eversion pertain only to the ____ feet
Which of the following conditions is generally considered a noninflammatory type of arthritis? osteoarthritis
Pointing the toes is an example of ____ plantar flexion
Tendon sheaths _____ act as friction reducing structures
Created by: samiidawnn



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