Muscle Test Flashcards
attaches to bone, conscious control, striated
skeletal muscle
found in internal organs, unconscious control, not striated
smooth muscle
found in heart, unconscious control, striated
cardiac muscle
immovable end of the muscle
origin
movable end of the muscle
insertion
the minimal strength of stimulation required to cause a contraction
threshold stimulus
a muscle fiber responds completely when exposed to a threshold stimulus or higher
all or none response
connections between cell membranes of cardiac muscle cells
intercalated disks
basic subunit of skeletal muscle contraction
sarcomere
what gives muscle its striated appearance?
the alternating pattern of actin and myosin
what makes up the motor unit?
muscle fiber and motor neuron
thin and light filaments (I-Band)
actin
thick and dark filaments (A-Band)
myosin
what causes rigor mortis?
death causes a depletion of ATP so the myosin cross bridge can form, but no “pull” can occur
contract slowly, fatigue slowly, have many mitochondria
slow twitch fibers
contract quickly, fatigue quickly, have few mitochondria
fast twitch fibers
if a muscle continues to be stimulated, at some point it won’t be able to hold the contraction which causes what?
fatigue
if a muscle is stimulated multiple times and doesn’t have time to relax completely, then it causes what?
summation
if a muscle is constantly stimulated and never relaxes, then it causes what?
tetanus
on a myogram, the period of time before a muscle contracts is called the what?
latent period
on a myogram, the period of time of the sudden burst of tension is called the what?
contraction period
on a myogram, the period of time of the decrease in tension is called the what?
relaxation period
