Anatomy and Phys Exam 4
the biceps brachii is an example of
parallel muscle
what flexes, adducts, and medially rotates humerus?
pectoralis major
during muscle contraction ATP is needed to?
promote cross-bridge detachment
which muscle would contract forcefully?
receiving 20-25 action potentials per second
which quad muscle is capable of hip flexion?
rectus femoris
infraspinatus and teres minor
rotates humerus laterally
which structure stores calcium ions inside the muscle cell?
sarcoplasmic reticulum
biceps brachii origin
scapula
origin of sternocleidomastoid?
sternum and clavicle
which is not a muscle of the rotator cuff? a- teres major b- subscapularis c- supraspinatus d- teres minor
teres major
what joint is an example of an synchondrosis?
the epiphyseal plate connecting the epiphysis and diaphysis of the long bone
which muscle is able to dorisflex the foot?
tibialis anterior
active site exposure during the contraction process occurs when calcium binds to
troponin
true/false: when muscles contract they always pull on the bone, never push
true
what is pronation?
turning the wrist from palm forward to backward
during muscle contraction, Ca++ are needed to?
uncover the active sites
a pivot joint is capable of?
uniaxial/monoaxial movement
cells are long and cyndrical, multinucleated, and appear to have striation?
voluntary
is synostosis considered a bony joint?
yes
true/false: is the biceps femoris a lateral hamstring muscle?
yes
during muscle contraction the sarcomere shortens, what is true?
zone of overlap becomes larger
there is less precise control over leg muscles compared to the muscles of the eye?
many by single
all of the muscle fibers controlled by a single motor neuron constitute a:
motor unit
what is the smallest structure associated with muscle tissue?
myofilaments
the gastrocnemius can be found?
operating as a second class lever
individual nuclei, small and spindle shaped, do not appear to have striation?
smooth muscle
which muscle is able to medially rotate the humerus?
subscapularis muscle
which muscle inserts on the greater tubercle of the humerus?
supraspinatus muscle
all of the following are considered to be fibrous joints except? a- tibia b- symphysis c- fibula d- gomphoses
symphysis
what is the least movable type of joint?
synarthrosis
deltoid muscle action
abducts arm
what is thin filament made of?
actin, troponin, tropomyosin
where can a plane joint be found?
at the acromioclavicular joint
rectus femoris is an an example of>
bipennate muscle
which muscle inserts on the ulna and is responsible for forearm flexion?
brachialis
abduct to humerus?
deltoid, supraspinatus
what is the most moveable joint?
diarthrosis
what do the external intercostal muscles do?
elevate the ribs
the outermost connective tissue covering of a skeletal muscle is the:
epimysium
true/false: the triceps brachii is able to extend the humerus at the elbow joint?
false
true/false: when muscles contract they push on a bone
false
bundles of muscle fibers are called:
fascicles
what are accessory structures (synovial joint)?
fat pads, bursae, tendons, ligaments
what is dorisflexion?
flexion at the ankle joint and elevation of the sole
what is the function of the sternocleidomastoid?
flexion of the neck
what muscle is able to flex the leg at the knee joint?
gastrocnemius
which muscle is not able to extend the thigh at the hip?
gluteus medius
which muscle originates on the pubis, inserts on the medial aspect of the tibia and adducts the femur?
gracilis
muscle contraction occurs as a result of?
interactions between the thick and thin filaments of the sarcomere
what describes twisting movement of the foot that turns the sole inward?
inversion
small and branched and contain a single nucleus, striated?
involuntary
how would the loss of acetylcholinesterase from the neuromuscular junction effect skeletal muscle?
it would cause spastic paralysis
where can a hinge joint be found?
knee joint
the phases of a twitch in sequential order are:
latent, contraction, relaxation
where does the temporalis muscle insert?
mandible