Anatomy and Physiology Exam 3 Questions And Already Passed Solutions.
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Course
Fundamentals of Anatomy and Physiology
Institution
Fundamentals Of Anatomy And Physiology
Sarcolemma -Answer muscle plasma membrane
Sarcoplasm -Answer cytoplasm of a muscle cell
Muscle cells respond to neural, stretch, or other signals by changing their _______. -Answer sarcolemma electrical potential (voltage)
The electrical potential change is coupled to intracellular c...
Anatomy and Physiology Exam 3
Questions And Already Passed
Solutions.
Sarcolemma -Answer muscle plasma membrane
Sarcoplasm -Answer cytoplasm of a muscle cell
Muscle cells respond to neural, stretch, or other signals by changing their _______. -Answer
sarcolemma electrical potential (voltage)
The electrical potential change is coupled to intracellular changes that result in ______. -Answer force
generation (contraction)
Contractility -Answer active shortening of muscle cell and generation of tension (force)
Extensibility -Answer passive stretching of muscle cells
Elasticity -Answer return of muscle cells to original resting length after being stretched
Which muscle tissue(s) has cells w/ obvious stripes called striations -Answer skeletal, cardiac
Which muscle tissue is voluntary and which is involuntary? -Answer voluntary-skeletal......involuntary-
cardiac,smooth
What muscle tissue contracts rapidly but tires easily? -Answer skeletal
Cardiac muscle contracts at a rate set by the heart's ________. -Answer pacemaker
,Which muscle tissue is primarily found in the walls of hollow visceral organs? -Answer smooth
Which muscle tissue forces food and other substances through internal body cavities? -Answer smooth
What are the three connective tissue sheaths? -Answer endomysium, perimysium, epimysium
What is a fine sheath of connective tissue composed of reticular fibers surrounding each muscle fiber? -
Answer endomysium
What is fibrous connective tissue that surrounds groups of muscle fibers called fascicles? -Answer
perimysium
What is an overcoat of dense regular connective tissue that surrounds the entire muscle? -Answer
epimysium
each muscle is served by ________. -Answer one nerve(bundle of nerve fibers), an atery, and one or
more veins
when muscles contract... -Answer the movable bone (insertion) moves toward the immovable bone
(origin)
How does a muscle attach to a bone directly? -Answer epimysium of the muscle is fused to the
periosteum of a bone (less common)
How does a muscle attach to a bone indirectly? -Answer connective tissue wrappings extend beyond
the muscle as a tendon or aponeurosis that attaches to a bone (more common)
What is a single muscle cell called? -Answer a myocyte or muscle fiber
Myocyte size -Answer 10 to 100 micrometers in diamter and many 10s of cm long
, Each mature myocyte is created by fusion of multiple precursor cells called _________. -Answer
myoblasts
Sarcoplasm has numerous ________ and an oxygen-binding protein called _________. -Answer
glycosomes, myoglobin
Myocytes contain the usual organelles, as well as.... -Answer myofibrils, sarcoplasmic reticulum, T-
tubules
Densly packed rodlike contractile elements are called ________. -Answer myofibrils
What is the smallest contractile unit of a muscle called? -Answer a sarcomere
What is the region of a myofibril b/w two succesive Z-discs? -Answer a sarcomere
What is a sarcomere composed of? -Answer thick and thin myofilaments made up of contractile
proteins
How long does a thick filament of a myofilament extend? A thin filament? -Answer thick: the entire
length of an A-band
thin:across the I band and part way into the A band
What is a coin-shaped sheet of proteins (connectins) that anchors the thin filaments and connects
myofibrils? -Answer Z-disc
Where do elastic filaments stretch and what are they made of? -Answer from Z-disc through the thick
filament to the M-line.
a huge protein called titin.
What are thick filaments composed of? -Answer 200-500 myosin protein molecules
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