Chapter 6
what creates alternating light and dark bands giving the striation pattern on skeletal muscle
A bands and I bands
Striated involuntary muscle tissue is classified as ________ muscle.
Cardiac
What is released by axon terminals into the synaptic cleft to stimulate a muscle to contract?
acetylcholine
What is the unstoppable electrical current that travels down the length of the entire surface of a sarcolemma?
action potential
Which movement is opposite to abduction?
adduction
Which muscle group adducts the thighs?
adductor group
muscles that preform opposite actions to one another are termed
antagonists
Which of the following is NOT a function of the muscular system?
blood cell formation
Striated involuntary muscle tissue found in the heart is
cardiac muscle
The heads of the myosin myofilaments are called ________ when they link the thick and thin filaments together during skeletal muscle contraction.
cross bridges
The prime mover of arm abduction is the ________ muscle.
deltoid
Which muscle forms the curved calf of the posterior leg?
gastrocnemius
Anaerobic glycolysis requires ________ to make ATP.
glucose only
Which muscle group includes the biceps femoris, semimembranosus, and semitendinosus?
hamstring group
Contractions in which muscles shorten and produce movement are known as ________.
isotonic contractions
What is the main function of the quadriceps group?
knee extension
what is the main function of the quadriceps group
knee extension
What is generated as a byproduct of anaerobic glycolysis
lactic acid
which one of the following is not a criterion generally used in naming muscles
method of attachment of the muscle to bone
A motor neuron and all of the skeletal muscle fibers it stimulates are termed a ________.
motor unit
An inherited disease that causes muscles to degenerate and atrophy is known as ________.
muscular dystrophy
The point of muscle attachment to an immovable or less movable bone is known as the ________.
originStriated involuntary muscle tissue is classified as ________ muscle.
Which of these muscles is located on the ventral (anterior) side of the body? pectoralis major ,gluteus medius, occipitalis ,gastrocnemius
pectoralis major
A sarcomere is ________.
the contractile unit between two Z discs
a sacromere is
the contractile unit between two Z discs
Jason injured his hamstring muscle group during football practice. He will be unable to perform ________.
thigh extension and knee flexion
which facial muscle is considered the smiling muscle that raises the corner of the mouth
zygomaticus
True or False: Cardiac and skeletal muscle both possess striations.
True
True or False: Cardiac muscle fibers are joined by special gap junctions called intercalated discs; these discs allow heart activity to be closely coordinated.
True
What is acetylcholine?
a neurotransmitter that stimulates skeletal muscle to contract
While doing "jumping jacks" during an exercise class, your arms and legs move laterally away from the midline of your body. This motion is called
abduction
The plasma membrane of a skeletal muscle cell is called the ________.
sarcolemma
What organelle wraps and surrounds the myofibril and stores calcium?
sarcoplasmic reticulum
Which term does NOT describe smooth muscle cells?
skeletal
which term does not describe smooth muscle cells
skeletal
What must rush into a muscle cell to promote its depolarization?
sodium ions
The gap between the axon terminal of a motor neuron and the sarcolemma of a skeletal muscle cell is called the ________.
synaptic cleft
