Muscles

Question 1

This is where the muscles are attached.

Answer 1

Origin

Question 2

This is where the muscle is pulled.

Answer 2

Insertion

Question 3

This is where the muscles get Action potential.

Answer 3

Nerve supply

Question 4

Cigar-shaped, multinucleate, striated, voluntary. Attach to and cover the bony skeleton

Answer 4

Skeletal Muscle

Question 5

Largest skeletal muscle

Answer 5

up to 30 cm length

Question 6

Give three types of muscles

Answer 6

Skeletal muscles
Smooth Muscle
Cardiac Muscles

Question 7

Organization of Skeletal Muscle

Answer 7

Epimysium
Perimysium
Endomysium

Question 8

surrounds the whole muscle

Answer 8

Epimysium

Question 9

surrounds each fascicle

Answer 9

Perimysium

Question 10

surrounds each individual muscle fiber

Answer 10

Endomysium

Question 11

Spindle-shaped, uninucleate, no striations involuntary. Found mainly in the walls of hollow visceral organs.

Answer 11

Smooth Muscle

Question 12

Spiral or figure 8-shaped, Uninucleate, Striated, Involuntary. Propels blood thought the blood vessels to all body tissues.

Answer 12

Cardiac Muscle

Question 13

structural and functional units of skeletal muscle

Answer 13

Sarcomere

Question 14

Also called thick filaments

Answer 14

Myosin

Question 15

called cross-bridges

Answer 15

Myosin heads

Question 16

Attaches the myosin to the Z discs

Answer 16

Titin

Question 17

also called thin filaments

Answer 17

Actin

Question 18

Explain the Skeletal muscle activity.

Answer 18

Ca channels open
Calcium enters
Calcium causes synaptic vesicles in the axon terminal to release ACh
ACh diffuses across the synaptic cleft and binds to receptors in the sarcolemma.
ACh binds and opens channels that allow the passage of Na Ions
AP travels the entire surface of the sarcolemma

Question 19

What breakdowns ACh?

Answer 19

Acetylcholinesterase

Question 20

Explain the mechanism of muscle contraction.

Answer 20

AP stimulate the sarcoplasmic reticulum to release Ca ions.
Ca ions trigger the binding of myosin to actin, initiating filament sliding.
When AP ends, Ca ions are returned to SR and the muscle fiber relaxes.

Question 21

Contain only the actin

Answer 21

I line

Question 22

Whole myosin

Answer 22

A band

Question 23

Imaginary line in the center

Answer 23

M line

Question 24

Space between actins

Answer 24

H zone

Question 25

This is the border of the sacromere

Answer 25

Z disc

Question 26

Capping protein for the barbed end of actin filament.

Answer 26

CapZ

Question 27

What happens to the I band when contraction?

Answer 27

Shorten

Question 28

What happens to the H zone when contraction?

Answer 28

disappear

Question 29

Types of muscle contraction

Answer 29

Isotonic and Isometric contraction

Question 30

Two types of isotonic contraction

Answer 30

Concentric contraction Eccentric Contraction

Question 31

This is the shortening of muscle.

Answer 31

Isotonic (Concentric) Contraction

Question 32

Lengthening of muscle

Answer 32

Isotonic (Eccentric) Contraction

Question 33

Contractions in which the muscle do not shorten.

Answer 33

Isometric Contraction

Question 34

generally in the sagittal plane, that decreases the angle of the joint and brings to bones closer together

Answer 34

Flexion

Question 35

movement of a bone around its longitudinal axis; movement of atlas around the axis

Answer 35

Rotation

Question 35

opposite of flexion

Answer 35

Extension

Question 36

moving a limb away from the midline

Answer 36

Abduction-

Question 36

opposite of abduction

Answer 36

Adduction

Question 37

proximal end of the limb is stationary and its distal end moves in a circle

Answer 37

Circumduction

Question 37

up movement of the foot at the ankle

Answer 37

Dorsiflexion

Question 37

down movement of the foot at the ankle

Answer 37

Plantar flexion

Question 38

turning the sole medially

Answer 38

Inversion

Question 39

turning the sole laterally

Answer 39

eversion

Question 40

FA rotates laterally and palm faces anteriorly

Answer 40

Supination

Question 41

FA rotates medially so that the palm faces posteriorly

Answer 41

pronation

Question 42

action by which you move your thumb to touch the tips of the other fingers on the same hand

Answer 42

Opposition

Question 43

Interactions of Skeletal Muscles (4)

Answer 43

Prime movers Antagonists Synergists Fixators

Question 44

muscle that has the major responsibility for causing a particular movement

Answer 44

Prime mover-

Question 45

muscles that oppose or reverse a movement

Answer 45

Antagonist

Question 46

help prime movers by producing the same movement or by reducing undesirable movements

Answer 46

Synergists

Question 47

they hold a bone still

Answer 47

Fixators

Question 48

What nerve is the lateral rectus?

Answer 48

Abducens Nerve

Question 49

What verve is the Superior oblique?

Answer 49

Trochlear Nerve

Question 50

Raises eyebrows

Answer 50

Occipitofrontalis

Question 51

Frowning

Answer 51

Corrugator Supercilii

Question 52

Disgust (wrinkles bridge nose)

Answer 52

Procens

Question 53

Smiling

Answer 53

Zygomaticus major and minor

Question 54

which is located on each side of your mouth and aids in smiling (grimace)

Answer 54

risorius

Question 55

Kissing

Answer 55

Orbicularis Oris

Question 56

Sucking, blowing, kissing

Answer 56

Buccinator

Question 57

Sneering (contemptuous smiling)

Answer 57

Levator Anguli Oris

Question 58

which can open your nostrils and lift your upper lip

Answer 58

Levator labii superioris

Question 59

pouting

Answer 59

Mentalis

Question 60

depress angle of the mouth

Answer 60

Platysma

Question 61

a muscle that runs from each cheek to each side of your jaw and helps your jaw close.

Answer 61

masseter

Question 62

Move ears

Answer 62

Auricularis