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68C Ch.8 Ph.1 T.3

Hole's Essential of A&P Chapter 8: Muscular System

Name the three types of muscle a.Cardiac b.Smooth c.Skeletal
Cardiac muscle bulk of the heart, dark bands(intercalated disc), allows heart to contract as a unit
Smooth muscle involuntary, no striations, single nuclei
Skeletal muscle voluntary, 40-50% of body weight, crosswise stripes
Aponeuroses connective tissue forms broad fibrous sheets, connect to adjacent muscles/bones
Sarcomere Z-lines, structural unit of skeletal muscle, repeating patterns of units
Tonic contractions specialized contractions few muscle fibers shorten at one time
Neuromuscular junction synapse (functional connection) between the motor neuron and the muscle fiber it controls
Motor unit Motor neuron and skeletal muscle fibers innervated by motor neuron's axonal terminal
Tetanic convulsions steady muscular contracture of stimuli in rapid succession
Tendon projection of connective tissue beyond ends of muscles that attaches to bone
Fascia dense connective tissue that separates skeletal muscle from adjacent muscle and holds it in position
Sarcoplasmic Reticulum network of membranous channels that surround each myofibril and run parallel to it (corresponds to ER)
2 proteins contained within the myofibril a.myosin (thick) b.actin (thin)
Neurotransmitter transmits signals across a synapse from one neuron to another "target" neuron ie muscle cell
Secreted by the neuron, begins the process of muscle fiber contraction acetylcholine
Ways muscles may become fatigued Exercising for increased period of time, interruption in blood supply, lack of acetylcholine in motor neuron axons, lactic acid
The connective tissue that surrounds individual muscle fibers is called endomysium
The dark bands in skeletal muscle that contribute to its striated appearance are known as A bands
When a nerve impulse reaches the end of a motor neuron, acetylcholine is released
ATPase is stored in the globular portion of the myosin filament
Which of the following is not characteristic of the motor end plate on a muscle fiber? synaptic vesicles
Created by: ajwildasin30
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