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1403 - Homework Assignment 10

front 1

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.

back 1

all of these choices are correct.

front 2

In the drawing, the circle is indicating a:
----

filament.

myofibril.

muscle fiber.

myofibril fascicle.

somatic motor neuron.

back 2

muscle fiber.

front 3

Which of the following is directly responsible for transmitting an action potential from a motor neuron to a skeletal muscle fiber?

intercalated discs

gap junctions

myofibrils

creatine phosphate

acetylcholine

back 3

acetylcholine

front 4

Which of the following correctly lists the sequence of structures that action potentials must move through to excite skeletal muscle contraction?

--

axon of neuron, sarcolemma, T tubules

myofibrils, myofilaments, mitochondria

sarcolemma, axon of neuron, T tubules

T tubules, sarcolemma, myofilament

muscle fiber, axon of neuron, myofibrils

back 4

axon of neuron, sarcolemma, T tubules

front 5

Skeletal muscle contraction will continue to occur as long as the following chemicals are available in the cytosol of the muscle fiber.

ATP and acetylcholine (ACh)

ACh and potassium ions

Sodium ions and ATP

Calcium and ACh

Calcium ions and ATP

back 5

calcium ions and ATP

front 6

Calcium binds to the troponin-tropomyosin complex and allows myosin to access the actin filaments.

True

False

back 6

True

front 7

Choose the correct sequence of events:

Action potential reaches synapse—Acetylcholine is released by motor neuron— Calcium ions enter motor neuron— Sodium ions flood into the muscle cell— Acetylcholine binds to gated ion channels on sarcolemma, transferring the action potential.

Action potential reaches synapse—Calcium ions enter motor neuron—Acetylcholine is released by motor neuron—Acetylcholine binds to gated ion channels on sarcolemma—Sodium ions flood into the muscle cell, transferring the action potential.

Action potential reaches synapse— Acetylcholine is released by motor neuron—Acetylcholine binds to gated ion channels on sarcolemma—Calcium ions enter motor neuron—Sodium ions flood into the muscle cell, transferring the action potential.

None of these.

back 7

Action potential reaches synapse—Calcium ions enter motor neuron—Acetylcholine is released by motor neuron—Acetylcholine binds to gated ion channels on sarcolemma—Sodium ions flood into the muscle cell, transferring the action potential.

front 8

A group of muscle cells stimulated by a single motor neuron is known as a

-----

neuron divergence.

motor unit.

myofibril.

contractile structure.

back 8

motor unit.

front 9

Frequency of stimulation of a muscle cell is not a factor that influences tension.

True

False

back 9

False

front 10

Alternate contractions allow for sustained contraction in a whole muscle.

True

False

back 10

True

front 11

This structure is unique to cardiac muscle cells, and allows individual cells to be firmly attached to each other (to provide mechanical strength during contraction), and also allow the action potential to spread rapidly through the cardiac muscle tissue, so that contractions are smooth and coordinated.

----

sarcomeres

desmosomes

gap junctions

intercalated discs

Z discs

back 11

intercalated discs

front 12

Smooth muscle fibers do not have striations like skeletal and cardiac muscle cells do. This is because:

-----

the sarcomeres are smaller than in cardiac muscle cells and skeletal fibers, and aren't visible even when smooth muscle fibers are examined microscopically

smooth muscle fibers contain only intermediate filaments, which aren't arranged in sarcomeres

smooth muscle fibers contain thin and thick filaments, as well as intermediate filaments, but none of them are arranged in sarcomeres

visceral smooth muscle fibers don't have striations, but multiunit smooth muscle cells do, but these cells are more rare, and so we rarely have a chance to view them with a microscope

smooth muscle fibers contain only intermediate filaments, which aren't arranged in sarcomeres and visceral smooth muscle fibers don't have striations, but multiunit smooth muscle cells do, but these cells are more rare, and so we rarely have a chance to view them with a microscope

back 12

smooth muscle fibers contain thin and thick filaments, as well as intermediate filaments, but none of them are arranged in sarcomeres

front 13

Which of the following types of muscle tissue contract when excited by their own autorhythmic muscle fibers?

-----

cardiac muscle

slow twitch oxidative skeletal muscle

multi-unit smooth muscle

fast twitch glycolytic skeletal muscle

all of these choices are correct

back 13

cardiac muscle

front 14

Smooth muscle tone is maintained by the prolonged presence of _____ in the muscle cell’s cytosol?

ATP

Calcium ions

Phosphate ions

Myoglobin

None of these choices

back 14

Calcium ions