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