Exss 175 Muscle Terms

Front 1

what are the functions of muscle tissue?

Back 1

producing body movements, stabilizing body positions, regulating organ volumes, movement of substances within the body, and producing heat

Front 2

what regulates organ volumes?

Back 2

bands of smooth muscle called sphincters

Front 3

what substances in the body do muscle tissue move?

Back 3

blood, lymph, urine, air, food, fluids, sperm

Front 4

how does muscle tissue produce heat?

Back 4

involuntary contractions of skeletal muscle (shivering)

Front 5

contraction of biceps brachii=

Back 5

Effort (E)

Front 6

weight of object plus forearm=

Back 6

Load (L)

Front 7

elbow joint=

Back 7

Fulcrum (F)

Front 8

fascicles parallel to longitudinal axis of muscle; terminate at either end in flat tendons

Back 8

parallel fascicles

Front 9

fascicles nearly parallel to longitudinal axis of muscle; terminate in flat tendons; muscle tapers toward tendons, where diameter is less than at belly

Back 9

fusiform fascicles

Front 10

fascicles in concentric circular arrangements from sphincter muscles that enclose an orifice (opening)

Back 10

circular fascicles

Front 11

fascicles spread over broad area converage at thick central tendon; gives muscle a triangular appearance

Back 11

triangular fascicles

Front 12

short fascicles in relation to tal muscle length; tendon extends nearly entire length of muscle

Back 12

pennate fascicles

Front 13

fascicles are arranged on only one side of tendon

Back 13

unipennate fascicles

Front 14

fascicles are arranged on both sides of centrally positioned tendons

Back 14

bipennate fascicles

Front 15

fascicles attach obliquely from many directions to several tendons

Back 15

multipennate fascicles

Front 16

attaches to bone skin or fascia, striated with light and dark bands visible with scope, voluntary control of contraction and relaxation

Back 16

skeletal muscle

Front 17

striated in appearance, involuntary control, autorhythmic because of built in pacemaker

Back 17

cardiac muscle

Front 18

attached to hair follicles in skin, in walls of hollow organs (blood vessels and GI), nonstraited in appearance, involuntary control

Back 18

smooth muscle

Front 19

what covers muscle?

Back 19

epimysium

Front 20

muscle is composed of many bundles of muscle fibers called __________

Back 20

fascicles

Front 21

fascicles are covered by _____________

Back 21

perimysium

Front 22

each muscle fiber is composed of numerous ____________

Back 22

myofibrils

Front 23

___________ are the contractile elements of muscle

Back 23

myofibrils

Front 24

the functional unit of the muscle is the _______________

Back 24

sarcomere

Front 25

thin filaments are made of ___________

Back 25

actin, troponin, and tropomyosin

Front 26

thick filaments are composed of __________-

Back 26

myosin

Front 27

each __________ represents two golf clubs twisted together

Back 27

molecule

Front 28

_____________ (cross bridges) extend toward the thin filaments

Back 28

myosin heads

Front 29

filaments held in place by the __________ proteins

Back 29

M line

Front 30

the myosin-binding site on each actin molecule is covered by _____________ in relaxed muscle

Back 30

tropomyosin

Front 31

the thin filaments are held in place by __________

Back 31

Z lines

Front 32

from one Z line to the next is a ________________

Back 32

sarcomere

Front 33

what is the functional unit of skeletal muscle?

Back 33

motor unit

Front 34

what is the motor unit composed of?

Back 34

single motor neuron and muscle fibers that it innervates

Front 35

motor units have one _________ on each muscle cell

Back 35

motor end plate

Front 36

each nerve can __________ multiple muscle cells

Back 36

innervate

Front 37

finely tuned muscles (ex: for controlling fingers) have fewer _________ per nerve

Back 37

motor units

Front 38

extra-ocular has how many fibers?

Back 38

12

Front 39

gastrocnemius has how many fibers?

Back 39

1000-2000

Front 40

nerve innervates group of muscle fibers with _______contractile and metabolic properties

Back 40

similar

Front 41

isotonic contractions=

Back 41

a load is moved

Front 42

concentric contraction=

Back 42

a muscle shortens to produce force and movement

Front 43

eccentric contractions=

Back 43

a muscle lengthens while maintaining force and movement

Front 44

isometric contraction=

Back 44

no movement occurs

Front 45

tension is generated without muscle shortening, maintaining posture and supports objects in a fixed position

Back 45

isometric contraction