the muscular system

Question 1

what % of the body is skeletal muscle

Answer 1

40-50

Question 2

what is skeletal muscle primarily attached to

Answer 2

bones

Question 3

are skeletal muscles voluntarily or nonvoluntary

Answer 3

voluntary

Question 4

are skeletal muscles striated or nonstriated

Answer 4

striated

Question 5

what is the purpose of skeletal muscles

Answer 5

movement and stability

Question 6

are cardiac muscles striated or nonstriated

Answer 6

striated

Question 7

where is the only part of the body that cardiac muscle is found

Answer 7

heart

Question 8

is cardiac muscle voluntary or nonvoluntary

Answer 8

nonvoluntary

Question 9

what is the purpose of cardiac muscle

Answer 9

develops pressure for arterial blood flow

Question 10

are smooth muscles voluntary or nonvoluntary

Answer 10

nonvoluntary

Question 11

are smooth muscles striated or nonstriated

Answer 11

nonstriated

Question 12

where are smooth muscles found

Answer 12

walls of hollow organs

Question 13

what is the purpose of smooth muscles

Answer 13

maintain diameter of organs, moves material in GI, urinary and reproductive tract

Question 14

what are the function of all muscles

Answer 14

production of body movements
stabilization of body
regulation of organ volume
movement of substances internally
production of heat

Question 15

what parts do skeletal muscles include

Answer 15

muscle fibers, connective tissue, nerves and blood vessels

Question 16

what are skeletal muscles wrapped in

Answer 16

epimysium

Question 17

what surrounds fiber bundles in skeletal muscle tissue

Question 18

what surrounds fiber bundles in skeletal muscle tissue

Answer 18

perimysium

Question 19

what are fiber bundles in skeletal muscles called

Answer 19

fascicles

Question 20

what surrounds each induvial fiber in skeletal muscle

Answer 20

endomysium

Question 21

what are skeletal muscles well supplied with

Answer 21

blood vessels and nerves

Question 22

what is included on each muscle fiber on skeletal muscles

Answer 22

neuron

Question 23

what shape are muscle fibers

Answer 23

elongated cylindrical cells

Question 24

what is the plasma membrane called in muscles

Answer 24

sarcolemma

Question 25

what is a transverse/ T-tubules

Answer 25

membrane extensions from surface to center of each fiber

Question 26

what is the sarcoplasm and what does it contain

Answer 26

the cytoplasm
contains myoglobin - carries O2

Question 27

where do the multiple nuclei of muscles lie

Answer 27

near the surface

Question 28

what is the sarcoplasmic reticulum

Answer 28

the equivalent of the endoplasmic reticulum
-stores calcium ions

Question 29

what is along the entire length of muscles

Answer 29

myofibrils

Question 30

what are myofibrils made of

Answer 30

protein filaments

Question 31

what overlaps in a repeating pattern in the sarcomere

Answer 31

action and myosin filaments

Question 32

what are sarcomeres separated by

Answer 32

z-discs

Question 33

what are the dark area of sarcomeres called and what causes them

Answer 33

A-band
thick filaments

Question 34

what zone in sarcomeres has no filaments

Answer 34

H-zone

Question 35

what band on a sarcomere has no thick filaments

Answer 35

I-band

Question 36

describe the structure of thick filaments

Answer 36

has moveable heads

Question 37

what blocks myosin at the binding site at rest

Answer 37

tropomysosin

Question 38

what are thin filaments anchored to

Answer 38

z-discs

Question 39

describe thin filaments structurally

Answer 39

contain myosin binding sites for myosin heads
also contain tropomyosin and troponin

Question 40

what happens during contraction

Answer 40

myosin heads bind to active sites
pull and slide actin molecules go towards the H-zone
I-bands and H-zones narrow
sarcomeres shorten