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31 terms

CH 9 Q &A

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The connective tissue covering that encloses the sarcolemma of an individual muscle fiber is called
Endomysium
A fascicle is a
bundle of muscle fibers enclosed by a connective tissue sheath
Thick and thin myofilaments have different compositions.
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contains actin
thin fillament
Contains ATPases
thick
Attaches to the z disc
thin
Contains myosin
thick
Contains troponin
thin
Does not lie in the I band
thick
The function of T tubules in muscle contraction is to
transmit the action potential deep into the muscle cells
The sites where the motor nerve impulse is transmitted from the nerve endings to the skeletal muscle cell membranes are the
neuromuscular junctions
Contractions elicited by a single brief stimulus is called
a twitch
A smooth, sustained contraction resulting from very rapid stimulation of the muscle, in which no evidence of relaxation is seen is called
fused tetanus
Characteristics of isometric contractions include all but
Shortening
During muscle contraction, ATP is provided by
A) a coupled reaction of creatine phosphate with ADP, B) aerobic desperation of glucose, and C) anaerobic glycolysis
Which provides ATP fastest?
A) a coupled reaction of creatine phosphate with ADP
Which does (do) not require that oxygen be available?
A) a coupled reaction of creatine phosphate with ADP) & C) Aneaerobic glycolysis
Which provides the highest yield of ATP per glucose molecule?
B) aerobic desperation of glucose
Which results in the formation of lactic acid?
C) anaerobic glycolysis
Which has carbon dioxide and water products?
B) aerobic desperation of glucose
Which is most important in endurance sports?
B) aerobic desperation of glucose
The neurotransmitter released by somatic motor neurons is
acetylcholine
The ions that enter the skeletal muscle during action potential generation are
sodium ions
Myoglobin has a special function in muscle tissue, it
holds a reserve supply of oxygen in the muscle
Aerobic exercise results in all of the following except
increased size and strength of existing muscle cells
Name and describe the 4 special functional abilities of muscle that are the basis for muscle response
Excitability; ability to receive and respond to a stimulus on the inside or outside of the body. Contractility; ability to shorten forcibly when adequelty stimulated. Extensibility; ability to be stretched or extended. Elasticity; ability to recoil and resume its resting length after being stretched.
Distinguish between direct and indirect muscle attachments and tendon and an aponeurosis
In direct or (FLESHY) attachment the epimysium of the muscle is fused to the periosteum of a bone or perichondrium of cartilage. In indirect attachments the muscles connective tissue wrappings extend beyond the muscle as either a rope like tendon or as a sheet like aponeurosis. A tendon is rope like and aponeurosis sheet like.
Describe the structure of a sarcomere and indicate the relationship of the sacromere to myofilaments.
A sarcomere is a segment of a myofibril containing thick and thin filaments. Sarcomere is the contractile unit, composed of myofilaments.
Explain the sliding filament theory of contraction
States that during contraction the thin filaments slide past the thick ones so that actin and myosin filaments overlap to a greater degree. In a relaxed muscle fiber the thick and thin filaments overlap only at the ends of the A band.
What is the importance of acetylcholinesterase in muscle contraction?
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Explain how a slight but smooth contraction differs from a vigorous contraction of the same muscle; use the concepts of multiple motor unit summation
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