How can we help?

You can also find more resources in our Help Center.

40 terms

Muscular System Crossword

STUDY
PLAY
myofibrils
composed primarily of actin and myosin
visceral smooth muscle
composed of sheets of muscles; found in walls of visceral organs; displays rhythmicity
peristalsis
rhythmic, wavelike motion produced by smooth muscles in tubular visceral organs
temporalis
closes the jaw
intercalated disks
found at the ends of cardiac muscle used to hold adjacent cells together
all-or-none response
when a muscle fiber contracts, it contracts completely
calcium
these ions combine with the troponin to change the shape of the tropomyosin so that it bonds with the cross-bridges of the myosin
pyruvic acid
molecules produced during anaerobic respiration from conversion of glucose
sarcomere
responsible for the striated apppearance of skeletal muscles
cholinesterase
enzyme that causes acetylcholine to decompose
transverse tubules
found between or on the cisternae; function is to transmit a muscle impulse into the cell interior
gluteus maximus
extends the leg at the hip
ATP
Lack of this causes muscle cramps
gastrocnemius
flexes the leg at the knee
sternocleidomastoid
pulls the head to one side
aponeurosis
broad, fibrous sheet of connective tissue that attaches the coverings of adjacent muscles
myosin
contains the cross-bridges that join actin at active sites (areas on the surface of actin that contain ADP molecules)
threshold stimulus
minimal strength of stimulation needed to cause a muscle contraction
latent period
delay between the time a stimulus is applied and the time the muscle respons
rigor mortis
occurs after death when muscles fail to relax due to a lack of ATP
liver
organ that is able to convert lactic acid into glucose
deltoid
abducts the upper arm
muscle tone
partial but sustained contraction
ATPase
the enzyme that breaks down ATP to get energy
creatine
supplies energy for the synthesis of ATP
phosphate
contracts and relaxes more slowly than skeletal muscle; cells lack transverse tubules, have a single nucleus, and is under involuntary control
orbicularis oris
puckers lips
acetylcholine
neurotransmitter released by motor neurons in order to stimulate skeletal muscle fibers
tetanic contraction
forceful, sustained muscle contraction
endomysium
separated individual muscle fibers
motor end plate
the folded muscle fiber membrane found at the neuromuscular junction
serratus anterior
pulls the scapula downward
gracilis
adducts the thigh
neurotransmitter
stored in vesicles within motor neuron endings
mitochondria
place in which aerobic respiration occurs
epimysium
outermost layer of connective tissue surrounding a skeletal muscle
synergists
muscles that assist a prime mover
motor unit
consists of a motor neuron and the muscle fibers that it controls
myoglobin
the pigment responsible for the reddish brown color of skeletal muscle
oxygen debt
amount of oxygen needed to support the conversion of lactic acid to glycogen (polymers of glucose)