ch 10 for A & P 1 final carley

True

A muscle fascicle can be viewed without magnification. -True -False

divide

After the fusion of myoblasts, the muscle fiber loses its ability to do what? -grow -lengthen -contract -divide -all of the answer choices

skeletal muscle cells only.

Cylindrical muscle cells that contain multiple nuclei would be -smooth muscle cells only. -both skeletal and smooth muscle cells. -both skeletal and cardiac muscle cells. -skeletal muscle cells only. -cardiac muscle cells only.

True

Diffusion is a required process for muscular contraction. -True -False

M line.

During muscle contraction by the sliding filament mechanism, thin filaments are pulled towards the -Z disc. -H zone. -M line. -A band. -I band.

synaptic end bulbs.

In neuromuscular junctions, vesicles containing acetylcholine are found suspended in the -myelin bulbs. -neuromuscular bulbs. -synaptic end bulbs. -axon collateral bulbs. -tubule bulbs.

False

Most of the sarcoplasm of a muscle cell is occupied by mitochondria. -True -False

True

Muscle contraction requires ATP. -True -False

True

Muscle contraction requires Ca++. -True -False

all of the above

Myofibrils contain -contractile proteins. -regulatory proteins. -structural proteins. -all of the above. -none of these answers are correct.

False

Myosin filaments look like strings of twisted beads. -True -False

False

Regulatory proteins help keep thick and thin filaments in proper alignment. -True -False

terminal cisterns of sarcoplasmic reticulum

Release of calcium from these structures triggers skeletal muscle contraction. -myofibrils -mitochondria -terminal cisterns of sarcoplasmic reticulum -sarcolemma -none of the answer choices

muscle, fascicle, muscle fiber, myofibril, myofilament

Select the correct order of muscle components, progressing from larger to smaller. -muscle, myofibril, muscle fiber, fascicle, myofilament -muscle, muscle fiber, fascicle, myofibril, myofilament -muscle, fascicle, muscle fiber, myofibril, myofilament -fascicle, muscle, muscle fiber, myofibril, myofilament -muscle, muscle fiber, fascicle, myofilament, myofibril

True

Smooth muscle tissue is both nonstriated and involuntary. -True -False

place where adjacent sarcomeres are joined together.

The Z (disc) line is the -place where adjacent sarcomeres are joined together. -point where the axon and the sarcolemma meet. -middle of a sarcomere. - area of a sarcomere where only thick myofilaments are found. -place where two cardiac muscle cells meet.

myofibrils

The contractile portions of a skeletal muscle fiber are thread-like structures called -myofibrils. -myoglobin. -mitochondria. -Z discs. -M lines.

All of these choices are correct

The different types of muscle tissue differ from each other by -microscopic anatomy. -location. -type of Control. -both microscopic anatomy and location. -All of these choices are correct.

False

The longest muscle fibers in the body are about 4 inches long. -True -False

plasma (cell) membrane of a muscle fiber.

The sarcolemma is the -cytoplasm of a myofiber. -separation between sarcomeres in a myofibers. -plasma (cell) membrane of a muscle fiber. -structure that produces acetylcholine. -storage site for calcium ions in myofibers.

False

The thick filaments in a myofilament are made of the protein actin. -True -False

epimysium

This is the outermost layer of connective tissue surrounding a skeletal muscle. -tendon -ligament -endomysium -epimysium -perimysium

extensibility

This is the property of muscle that gives it the ability to stretch without damage. -electrical excitability -contractility -extensibility -elasticity -thermogenesis

synaptic cleft

To stimulate skeletal muscle contraction, acetylcholine must cross the __________ of the neuromuscular junction and bind to receptors on the motor endplate. -node of Ranvier -synaptic cleft -sarcolemma -synaptic end bulb -transverse tubule

ATP hydrolysis reaction

What energizes the myosin head? -the actin filaments -calcium ions -potassium ions -ATP hydrolysis reaction -ADP synthesis

the synaptic end bulb of a nerve and the sarcolemma

What structures meet at the neuromuscular junction? -the synaptic end bulb of a nerve and thick myofilaments -an axon and the sarcoplasmic reticulum -the synaptic end bulb of a nerve and the sarcolemma -the sarcolemma and the T tubules -the sarcoplasmic reticulum and the synaptic end bulb of a nerve

axon of neuron, sarcolemma, T tubules

Which of the following correctly lists the sequence of structures that action potentials must move through to excite skeletal muscle contraction? -sarcolemma, axon of neuron, T tubules -T tubules, sarcolemma, myofilament -muscle fiber, axon of neuron, myofibrils -axon of neuron, sarcolemma, T tubules -myofibrils, myofilaments, mitochondria

Production of Vitamins.

Which of the following is NOT a major function of muscle tissue? -moving blood throughout the body -generating heat through contractions -stabilizing the movement of joints -promoting movement of body structures -Production of Vitamins.

calcium ions

Which of the following products binds with troponin to initiate muscle contraction? -sodium ions -calcium ions -ACh -myosin -None of these.

tropomyosin

Which of the products below covers the thin filament binding sites in a relaxed muscle? -calcium ions -sodium ions -troponin -tropomyosin -None of these

Most of the muscle tissue of the body is smooth (nonstriated) muscle.

Which of these is true? -Smooth muscle fibers have intercalated disks. -Cardiac muscle fibers have multiple nuclei. -Most of the muscle tissue of the body is smooth (nonstriated) muscle. -Skeletal muscles are also referred to as striated muscles or voluntary muscles. -None of the above.