Anatomy Chapter 6 Test
draws the corners of the lips downward
platysma
longitudinally and circularly arranged layers
smooth
Like the two-bellied muscle that lies over it, this muscle is a plantar flexor
soleus
skeletal muscle
A voluntary muscle that is attached to the bones of the skeleton and provides the force that moves the bones. move the body connected to the bones
muscle group that allows you to draw your legs to the midline of your body, as when standing at attention
adductors
used to suck in your cheeks
buccinator
step 2
calcium (Ca2+) channels open, and Ca2+ enters teh axon terminal.
coordinatied activity to act as a pump
cardiac
figure- packaging of the cells
cardiac
banded appearance
cardiac, skeletal
An unpaired muscle that acts with the muscles named immediately above to accomplish inspiration
diaphragm
Prime mover of back extension; a deep composite muscle consisting of three columns
erector spinae
deep muscles of the thorax that promote the inspiratory phase of breathing
external intercostal
part of the abdominal girdle; forms the external lateral walls of the abdomen
external oblique
muscle group of the lateral leg; plantar flex and evert the foot
fibularis muscles
wrinkles the forehead horizontally
frontalis
leg muscles that can cause movement at the knee joint include
gastrocnemius
used to extend the hip when climbing stairs
gluteus maximus
smaller hip muscle commonly used as an injection site
gluteus medius
large paired superficial muscle of the lower back
latissimus dorsi
the main muscles used when doing chinups are:
latissimus dorsi and brachialis
prime mover of jaw closure
masseter
sarcolemma
muscle cell membrane
step 1
nerve impulse reaches axon terminal of motor neuron.
squints the eyes
orbicularis oculi
used in winking
orbicularis oculi
puckers the lips
orbicularis oris
the "kissing" muscle
orbicularis oris
prime mover for shoulder flexion and adduction
pectoralis major
skeletal muscle is not involved in:
propulsion of a substance through a body tube
fleshy muscle forming part of the posterior abdominal wall that helps maintain upright posture
quadratus lumborum
the name means "straight muscles of the abdomen"
rectus abdominis
Which of these thigh muscles causes movement at the hip joint?
rectus femoris, biceps femoris, semitendinosus
which of the following are part of a thin myofilament?
regulatory proteins and globular actin
you ability to lift that heavy couch would be increased by which type of exercise?
resistance
Straplike muscle that is a weak thigh flexor; the "tailor's muscle"
sartorius
dense connective tissue packaging
skeletal
moved bones and the facial skin
skeletal
referred to as the muscular system
skeletal
voluntary
skeletal
select the type of muscle tissue that fit the following description: self-excitable, pacemaker cells, gap junction, limited sarcoplacmis reticulum.
smooth muscle
which of the following activities depends most on anaerobic metabolism?
sprinting
acting alone, each muscle of this pair turns the head toward the opposite shoulder
sternocleidomastoid
prime mover of head flexion, a two-headed muscle
sternocleidomastoid
transmission of the stimulus at the neuromuscluar junction involves:
synaptic vesicles, ACh, and axon terminal
synergist muscle for jaw closure
temporalis
smiling muscle
zygomaticus
used to show your happy
zygomaticus
Head muscles that insert on a bone include the:
zygomaticus, masseter, buccinator, temporalis
"toe dancer's" muscle; a two-bellied muscle of the calf
Gastrocnemius
step 3
Ca2+ entry causes sone synaptic vesicles to release their contents (the enurotransmitter acetylcholine) by exocytosis.
lateral flexion of the torso involves:
Erector spinae, quadratus lumborum, and external oblique.
prime mover of shoulder abduction
deltoid
binding sites for calcium are found on:
thin filaments
Inverts and dorsiflexes the foot
tibialis anterior
Muscle that allows you to shrug your shoulders or extend your head
trapezius
muscles that help stabilize the scapula and shoulder joints include:
trapezius
the major muscles used in doing push-ups are:
triceps brachii and pectoralis major
step 5
ACh binds and opens channels that allow simultaneous passage of Na+ into the muscle fiber and K+ out of teh muscle fiber. More Na+ ions enter than K+ ions leave, producing a local change in the electrical conditions of the membrane (depolarization). This eventually leads to an action potential.
step 4
Acetylcholine diffuses across the synaptic cleft and binds to receptors in the sarcolemma.
smooth muscle
Involuntary muscle found inside many internal organs of the body (not the heart)
cardiac muscle
Involuntary muscle tissue found only in the heart. wall of the heart
pulls scalp posteriorly
Occipitalis
muscles attached to the vertebral column include:
Quadratus lumborum, diaphragm, and latissimus dorsi.
the first energy source used to regenerate ATP when muscles are extemely active is:
creatine phosphate
besides the two abdominal muscles (pairs) named above, two muscle pairs that help form the natural abdominal girdle
internal oblique, transversus abdominis
Arm and leg muscles are arranged in antagonistic pairs. How does this affect their functioning?
it allows the muscles to produce opposing movements.
muscle A and muscle B are the same size, but muscle A is capable of much finer control than muscle B. Which of the following is likely to be true of muscle A?
it is controlled by more neurons than muscle B.
step 6
the enzymes acetylcholinesterase breaks down ACh in the synaptic cleft, ending the process.
pulls the eyebrows superiorly
the frontal belly of the epicranius
the movement of thin filaments toward the sarcomere is called:
the power stroke