Human Physiology Skeletal Muscle Lab Ucf

Front 1

Skeletal muscles are surrounded
by a fibrous _________

Back 1

epimysium

Front 2

Connective tissue called _________ subdivides the muscle into fascicles.

Back 2

perimysium

Front 3

Group of muscle fibers surrounded by a perimysium?

Back 3

fasicle

Front 4

Each fascicle is subdivided into _________ surrounded by _________

Back 4

-muscle fibers

-endomysium

Front 5

the ability to be stretched or extended.

Back 5

Extensibility

Front 6

the ability of a muscle fiber to resume its resting length.

Back 6

Elasticity

Front 7

region between two successive Z lines.

Back 7

Sarcomere

Front 8

protein that anchors in the thick filaments and allows elastic recoil of muscle.

Back 8

Titin

Front 9

I bands

Back 9

contain only thin filaments

Front 10

A bands

Back 10

contain both thick and thin filaments

Front 11

H bands

Back 11

are the center of the A band with no thin filament overlap.

Front 12

Z lines

Back 12

are found in the center of each I band

Front 13

M lines

Back 13

are found in the center of each A band and help hold down thick filaments.

Front 14

During contraction what zones move?

Back 14

H zone and I band narrow

Z lines move closer together

Front 15

Troponin complex and tropomyosin are ________ proteins

Back 15

regulatory

Front 16

__________ blocks the myosin binding site on actin

Back 16

Tropomyosin

Front 17

Calcium binds to __________. This causes a conformational change of __________ allows myosin to bind actin

Back 17

-troponin-c

-tropomyosin

Front 18

precision of muscle movement is indicated by

Back 18

Indicated by number of muscle fibers per motor unit

Front 19

Slow oxidative fiber - type 1

Back 19

•Smallest, lots Myoglobulin
•Slow contraction rate
•Longer peak reach tension
•Aerobic respiration- ATP synthesis
•Fatigue resistant-jogging

Front 20

-largest, low myoglobulin
-most powerful contraction
-Glycolysis-ATPsynthesis
-Strong & rapid contraction
-Intense movement - weight lifting
-Rapidly fatigued

Back 20

Fast glycolytic fiber - type 2

Front 21

•Medium sized, lots Myoglobulin
•Fast contraction rate
• walking/sprinting
•Aerobic respiration & Glycolysis- ATPsynthesis
•Moderate fatigue resistant

Back 21

fast oxidative-glycolytic fiber - type 2b

Front 22

type 1 fibers increase with increasing

Back 22

type 1 fibers increase with increasing endurance actiivity

Front 23

type 2a fibers decrease with increasing

Back 23

type 2 fibers decrease with increasing endurance activity

Front 24

type 2b fibers remain constant and drop off with increasing

Back 24

endurance activity

Front 25

isotonic contraction?

two types?

Back 25

tension remains constant while length changes

2 types: eccentric and concentric

Front 26

eccentric isotonic contraction

Back 26

muscle increases in length with contraction

Front 27

concentric isotonic contraction

Back 27

muscle decreases in length with contraction

Front 28

abductor muscle

Back 28

moves limb away from midline

Front 29

adductor muscle

Back 29

moves limb toward midline

Front 30

levator

Back 30

moves insertion upward

Front 31

depressor

Back 31

moves insertion downward

Front 32

The ratio of ____ muscle fibers to _______ fibers increases with increasing __________

Back 32

-ratio of fast type 2b (oxy-glycolytic) to fast type 2a (glycolytic) increases with increasing endurance activity

Front 33

type 1 other name?

Back 33

slow oxidative fiber

Front 34

type 2a other name?

Back 34

fast glycolytic fiver

Front 35

type 2b other name

Back 35

fast oxidative-glycolytic

Front 36

stretch on muscle spindle activates ________ fibers.

Back 36

intrafusal

Front 37

sensory neuron activates ________ located in the ______

Back 37

-alpha motor neuron

-spinal cord

Front 38

alpha motor neuron stimulates _______ to contract

Back 38

extrafusal fibers