muscular system

Question 1

what is the main function of the muscular system?

Answer 1

movement

Question 2

____ are attached to the bones in our bodies and allow our limbs to move.

Answer 2

muscle

Question 3

other than movement where else do muscles work?

Answer 3

heart
blood vessels
digestive organs
supports posture and create heat

Question 4

3 types of muscle

Answer 4

skeletal, cardiac, and smooth (visceral)

Question 5

how many muscles in the body?

Answer 5

over 600

Question 6

Where can visceral (smooth) muscle be found?

Answer 6

stomach
intestines
blood vessels

Question 7

can we consciously control visceral muscles?

Answer 7

no, involuntary muscle

Question 8

3 properties all muscles have in common?

Answer 8

excitability - electric gradient which can reverse when stimulated
contraction - tissues have ability to contract or shorten
elongate - tissues share the capacity to elongate or relax

Question 9

what is visceral muscle also called?

Answer 9

smooth muscle because of its smooth surface

Question 10

where is the only place cardiac muscle is found?

Answer 10

heart

Question 11

what do cardiac muscles do?

Answer 11

contract and pump blood through the body

Question 12

can cardiac muscle be controlled?

Answer 12

no, involuntary muscle

Question 13

is cardiac muscle weak or strong

Answer 13

strong

Question 14

what is cardiac muscle composed of?

Answer 14

individual muscle cells called cardiomyocytes that are joined together by intercalated discs

Question 15

what skeletal muscles can be voluntary controlled but usually operate involuntary?

Answer 15

diaphragm and muscles that control blinking

Question 16

only muscle that contracts and reacts and relaxes by voluntary control?

Answer 16

skeletal muscle

Question 17

what attaches skeletal muscles to the bone?

Answer 17

tendons

Question 18

what are tendons formed by?

Answer 18

connective tissue rich in collagen fibers

Question 19

what are skeletal muscles made out of?

Answer 19

muscle fibers (cells) that are bound together in parallel bundles

Question 20

what is striated muscle

Answer 20

muscle that has stripped appearance under a microscope

Question 21

is smooth muscle striated or nonstriated?

Answer 21

nonstriated

Question 22

each skeletal muscle contains a bundle of?

Answer 22

myofibrils

Question 23

myofibrils are composed of multiple repeating contractile units called?

Answer 23

sacromeres

Question 24

myofibrils contain two protein microfilaments:

Answer 24

thick filament and thin filament

Question 25

thick filament composed of?

Answer 25

protein myosin

Question 26

thin filament composed of ?

Answer 26

protein actin

Question 27

how are dark bands (striations) in skeletal muscles formed?

Answer 27

formed when thick and thin filaments overlap. light band occurs when thin filaments overlapped

Question 28

skeletal muscle attraction occurs when?

Answer 28

the thin filaments slide over the thick filaments, shortening the sarcomere

Question 29

what happens when a action potential (electrical signal) reaches a muscle fiber?

Answer 29

calcium ions are released; which bind to the myosin and actin that assist in binding myosin heads of the thick filaments to actin molecules of think filaments

Question 30

what does adenosine triphosphate released from glucose provide?

Answer 30

energy necessary for the contraction