BISC 206 Test 4 Ole Miss (Britson) Questions With
Complete Answers
List the 4 functions of muscle tissue - ANSWER 1. assist with movement
2. stabilize body position
3. store and move substances within the body
4. generate heat
List the 4 basic properties of muscle tissue - ANSWER 1. Excitability
2. Contractility
3. Extensibility
4. Elasticity
How can you describe a tissue or cell that is able to manipulate its charge through membrane
potentials? - ANSWER it is excitable
A substance that can stretch without breaking can be described as _________________ - ANSWER
extensible
A rubber band is ______________ because it returns to its original size and shape after being
stretched - ANSWER elastic
,____________ and _____________ muscle tissue CANNOT undergo mitosis, making repair of these
tissue types very difficult - ANSWER cardiac, skeletal
how do skeletal muscle cells become multinucleated? - ANSWER during the creation of the
muscle, multiple embryonic myoblasts fuse to create 1 cell
what are 2 special properties if cardiac muscle tissue and what purpose do they serve? -
ANSWER branched cells and intercalated disks, both give the tissue the ability to contract
simultaneously and produce a rhythmic heartbeat
while a heart has the ability to beat on its own, outside of the body - it must be connected to
the brain in order to do what? - ANSWER increase or decrease the rate at which it beats
Describe a fascia and where you would find it - ANSWER a band or sheet of dense irregular
connective tissue surrounding muscles and other organs
the epimysium, endomysium, and perimysium are all classified as _______________ - ANSWER
fascia
what is the name of the fascia which covers an entire muscle and is continuous with that
muscles tendon? - ANSWER epimysium
the ______________ covers a muscle fascicle, what is a fascicle? - ANSWER perimysium, a bundle
of muscle fibers
,a fascia that surrounds a single muscle fiber is called what? - ANSWER endomysium
what is the most abundant organelle within a muscle cell? - ANSWER the myofibril
what is found directly underneath the endomysium? what is it called? - ANSWER the plasma
membrane of the muscle cell, the sarcolemma
true or false , the sarcolemma creates a continuous sheath around a muscle cell - ANSWER
false, it extends into the cell
what are t-tubules? what purpose do they serve? - ANSWER extensions of the sarcolemma
into a muscle cell, they serve as pathways for an action potential to travel down
the prefix sarco is associated with _________________ - ANSWER skeletal muscle
which part of a skeletal muscle cell is rich in glycogen, myoglobin, and mitochondria? where is
it found? - ANSWER the sarcoplasm, it surrounds the myofibrils and fills the cell
in order to contract, a muscle cell must have stored calcium, where does it store it? - ANSWER
the sarcoplasmic reticulum
, the sarcoplasmic reticulum fully encircles the myofibrils of a muscle cell, why is this? -
ANSWER for better access to Ca++
describe the terminal cisternae of the sarcoplasmic reticulum - ANSWER enlarged portion of
the SR which surrounds the t-tubule
__________ + ___________ + ___________ = the triad - ANSWER sarcoplasmic reticulum + t-tubule +
terminal cisternae
what is the importance of the triad in muscle contraction? - ANSWER it is the point at which
an action potential begins the process of muscle contraction (by signaling the release of Ca++
from the SR)
what is the contractile unit of a muscle fiber? - ANSWER the sarcomere
the area between 2 z-disks is called the _________________ - ANSWER sarcomere
put the following in order from superficial to deep
1. muscle
2. myofibril
3. perimysium
4. muscle fiber
Complete Answers
List the 4 functions of muscle tissue - ANSWER 1. assist with movement
2. stabilize body position
3. store and move substances within the body
4. generate heat
List the 4 basic properties of muscle tissue - ANSWER 1. Excitability
2. Contractility
3. Extensibility
4. Elasticity
How can you describe a tissue or cell that is able to manipulate its charge through membrane
potentials? - ANSWER it is excitable
A substance that can stretch without breaking can be described as _________________ - ANSWER
extensible
A rubber band is ______________ because it returns to its original size and shape after being
stretched - ANSWER elastic
,____________ and _____________ muscle tissue CANNOT undergo mitosis, making repair of these
tissue types very difficult - ANSWER cardiac, skeletal
how do skeletal muscle cells become multinucleated? - ANSWER during the creation of the
muscle, multiple embryonic myoblasts fuse to create 1 cell
what are 2 special properties if cardiac muscle tissue and what purpose do they serve? -
ANSWER branched cells and intercalated disks, both give the tissue the ability to contract
simultaneously and produce a rhythmic heartbeat
while a heart has the ability to beat on its own, outside of the body - it must be connected to
the brain in order to do what? - ANSWER increase or decrease the rate at which it beats
Describe a fascia and where you would find it - ANSWER a band or sheet of dense irregular
connective tissue surrounding muscles and other organs
the epimysium, endomysium, and perimysium are all classified as _______________ - ANSWER
fascia
what is the name of the fascia which covers an entire muscle and is continuous with that
muscles tendon? - ANSWER epimysium
the ______________ covers a muscle fascicle, what is a fascicle? - ANSWER perimysium, a bundle
of muscle fibers
,a fascia that surrounds a single muscle fiber is called what? - ANSWER endomysium
what is the most abundant organelle within a muscle cell? - ANSWER the myofibril
what is found directly underneath the endomysium? what is it called? - ANSWER the plasma
membrane of the muscle cell, the sarcolemma
true or false , the sarcolemma creates a continuous sheath around a muscle cell - ANSWER
false, it extends into the cell
what are t-tubules? what purpose do they serve? - ANSWER extensions of the sarcolemma
into a muscle cell, they serve as pathways for an action potential to travel down
the prefix sarco is associated with _________________ - ANSWER skeletal muscle
which part of a skeletal muscle cell is rich in glycogen, myoglobin, and mitochondria? where is
it found? - ANSWER the sarcoplasm, it surrounds the myofibrils and fills the cell
in order to contract, a muscle cell must have stored calcium, where does it store it? - ANSWER
the sarcoplasmic reticulum
, the sarcoplasmic reticulum fully encircles the myofibrils of a muscle cell, why is this? -
ANSWER for better access to Ca++
describe the terminal cisternae of the sarcoplasmic reticulum - ANSWER enlarged portion of
the SR which surrounds the t-tubule
__________ + ___________ + ___________ = the triad - ANSWER sarcoplasmic reticulum + t-tubule +
terminal cisternae
what is the importance of the triad in muscle contraction? - ANSWER it is the point at which
an action potential begins the process of muscle contraction (by signaling the release of Ca++
from the SR)
what is the contractile unit of a muscle fiber? - ANSWER the sarcomere
the area between 2 z-disks is called the _________________ - ANSWER sarcomere
put the following in order from superficial to deep
1. muscle
2. myofibril
3. perimysium
4. muscle fiber
