A&P 1 Exam 3 | Anatomy and Physiology Prac ce Exam Ques on & Answers|
Updated 2026 |Newest!!!!
Sarcolemma - muscle plasma membrane
Sarcoplasm - cytoplasm of a muscle cell
Muscle cells respond to neural, stretch, or other signals by changing their _______. -
sarcolemma electrical poten al (voltage)
The electrical poten al change is coupled to intracellular changes that result in ______. - force
genera on (contrac on)
Contrac lity - ac ve shortening of muscle cell and genera on of tension (force)
Extensibility - passive stretching of muscle cells
Elas city - return of muscle cells to original res ng length a#er being stretched
Which muscle ssue(s) has cells w/ obvious stripes called stria ons - skeletal, cardiac
Which muscle ssue is voluntary and which is involuntary? - voluntary-skeletal......involuntary-
cardiac,smooth
What muscle ssue contracts rapidly but res easily? - skeletal
Cardiac muscle contracts at a rate set by the heart's ________. - pacemaker
, Which muscle ssue is primarily found in the walls of hollow visceral organs? - smooth
Which muscle ssue forces food and other substances through internal body cavi es? -
smooth
What are the three connec ve ssue sheaths? - endomysium, perimysium, epimysium
What is a fine sheath of connec ve ssue composed of re cular fibers surrounding each
muscle fiber? - endomysium
What is fibrous connec ve ssue that surrounds groups of muscle fibers called fascicles? -
perimysium
What is an overcoat of dense regular connec ve ssue that surrounds the en re muscle? -
epimysium
each muscle is served by ________. - one nerve(bundle of nerve fibers), an atery, and one or
more veins
when muscles contract... - the movable bone (inser on) moves toward the immovable bone
(origin)
How does a muscle a,ach to a bone directly? - epimysium of the muscle is fused to the
periosteum of a bone (less common)
How does a muscle a,ach to a bone indirectly? - connec ve ssue wrappings extend beyond
the muscle as a tendon or aponeurosis that a,aches to a bone (more common)
, What is a single muscle cell called? - a myocyte or muscle fiber
Myocyte size - 10 to 100 micrometers in diamter and many 10s of cm long
Each mature myocyte is created by fusion of mul ple precursor cells called _________. -
myoblasts
Sarcoplasm has numerous ________ and an oxygen-binding protein called _________. -
glycosomes, myoglobin
Myocytes contain the usual organelles, as well as.... - myofibrils, sarcoplasmic re culum, T-
tubules
Densly packed rodlike contrac le elements are called ________. - myofibrils
What is the smallest contrac le unit of a muscle called? - a sarcomere
What is the region of a myofibril b/w two succesive Z-discs? - a sarcomere
What is a sarcomere composed of? - thick and thin myofilaments made up of contrac le
proteins
How long does a thick filament of a myofilament extend? A thin filament? - thick: the en re
length of an A-band
thin:across the I band and part way into the A band
Updated 2026 |Newest!!!!
Sarcolemma - muscle plasma membrane
Sarcoplasm - cytoplasm of a muscle cell
Muscle cells respond to neural, stretch, or other signals by changing their _______. -
sarcolemma electrical poten al (voltage)
The electrical poten al change is coupled to intracellular changes that result in ______. - force
genera on (contrac on)
Contrac lity - ac ve shortening of muscle cell and genera on of tension (force)
Extensibility - passive stretching of muscle cells
Elas city - return of muscle cells to original res ng length a#er being stretched
Which muscle ssue(s) has cells w/ obvious stripes called stria ons - skeletal, cardiac
Which muscle ssue is voluntary and which is involuntary? - voluntary-skeletal......involuntary-
cardiac,smooth
What muscle ssue contracts rapidly but res easily? - skeletal
Cardiac muscle contracts at a rate set by the heart's ________. - pacemaker
, Which muscle ssue is primarily found in the walls of hollow visceral organs? - smooth
Which muscle ssue forces food and other substances through internal body cavi es? -
smooth
What are the three connec ve ssue sheaths? - endomysium, perimysium, epimysium
What is a fine sheath of connec ve ssue composed of re cular fibers surrounding each
muscle fiber? - endomysium
What is fibrous connec ve ssue that surrounds groups of muscle fibers called fascicles? -
perimysium
What is an overcoat of dense regular connec ve ssue that surrounds the en re muscle? -
epimysium
each muscle is served by ________. - one nerve(bundle of nerve fibers), an atery, and one or
more veins
when muscles contract... - the movable bone (inser on) moves toward the immovable bone
(origin)
How does a muscle a,ach to a bone directly? - epimysium of the muscle is fused to the
periosteum of a bone (less common)
How does a muscle a,ach to a bone indirectly? - connec ve ssue wrappings extend beyond
the muscle as a tendon or aponeurosis that a,aches to a bone (more common)
, What is a single muscle cell called? - a myocyte or muscle fiber
Myocyte size - 10 to 100 micrometers in diamter and many 10s of cm long
Each mature myocyte is created by fusion of mul ple precursor cells called _________. -
myoblasts
Sarcoplasm has numerous ________ and an oxygen-binding protein called _________. -
glycosomes, myoglobin
Myocytes contain the usual organelles, as well as.... - myofibrils, sarcoplasmic re culum, T-
tubules
Densly packed rodlike contrac le elements are called ________. - myofibrils
What is the smallest contrac le unit of a muscle called? - a sarcomere
What is the region of a myofibril b/w two succesive Z-discs? - a sarcomere
What is a sarcomere composed of? - thick and thin myofilaments made up of contrac le
proteins
How long does a thick filament of a myofilament extend? A thin filament? - thick: the en re
length of an A-band
thin:across the I band and part way into the A band
