Muscular Tissue

Question 1

muscle provide structural support, help maintain posture, regulate – into the body

Answer 1

openings

Question 2

muscles assist in thermoregulation via – that generate heat

Answer 2

contractions (shivering)

Question 3

muscles contract to move blood in veins toward the –

Answer 3

heart

Question 4

muscles assist in – circulation

Answer 4

peripheral

Question 5

skeletal and cardiac muscles are –

Answer 5

striated

Question 6

T/F: smooth muscle is not striated

Answer 6

true

Question 7

cardiac and smooth muscles are –

Answer 7

involuntary

Question 8

cells in skeletal muscle have – nuclei as the result of the fusing of multiple cells

Answer 8

multiple

Question 9

muscle cells also have high levels of – to provide ATP needed for contraction

Answer 9

mitochondria

Question 10

protein – acts as an oxygen reserve for muscles

Answer 10

myoglobin

Question 11

muscles are a bundles of muscle cells held together by –

Answer 11

connective tissue

Question 12

muscle cytoplasm

Answer 12

sacroplasm

Question 13

modified endoplasmic reticulum

Answer 13

sacrcoplasmic reticulum

Question 14

cell membrane

Answer 14

sacrolemma

Question 15

sacrolemma interacts with the nervous system via the – tubule system (T tubule)

Answer 15

transverse

Question 16

T tubule provides channels for – flow through the muscle and has anchor points for sarcomeres

Answer 16

ion

Question 17

within the muscle cells are bundles of muscle fibers called –

Answer 17

myofibrils

Question 18

myofibrils are made of protein –, troponin, tropomyosin, and myosin

Answer 18

actin

Question 19

actin fibers have a thin diameter and associate with the proteins troponin and tropomyosin to produce –

Answer 19

thin filaments

Question 20

myosin fibers have a thick diameter with protruding heads and are called –

Answer 20

thick filaments

Question 21

in skeletal muscles, the actin and myosin fibers overlap each other in highly organized, repeating units called –

Answer 21

sacromeres

Question 22

the overlapping of the actin and myosin fibers is what leads to the – of skeletal muscles

Answer 22

striation

Question 23

the shortening of sacromeres is what causes muscle –

Answer 23

contractions

Question 24

region of muscle tissues have where the sarcolemma is in contact via a synapse with the synaptic knobs of a motor neuron from the somatic branch of the peripheral nervous system

Answer 24

neuromuscular junction

Question 25

a neurotransmitter called -- is released from the motor neuron and binds to receptors on the sarcolemma, causing the initiation of an action potential that will result in shortening of the sarcomeres

Answer 25

acetylcholine

Question 26

the action potential that occurs based on stimulation from the motor neuron will cause the release of -- from the sarcoplasmic reticulum into the sarcoplasm

Answer 26

calcium

Question 27

calcium binds to the -- in the thin filaments, which causes a conformational shift in the tropomyosin protein in the thin filament

Answer 27

troponin

Question 28

change in shape allows for the exposure of -- on the actin

Answer 28

myosin binding sites

Question 29

myosin heads bind to the myosin binding sites on the actin forming --

Answer 29

crossbridges

Question 30

hydrolysis of ATP allows for the power stroke to occur, which pulls the thin filaments toward the -- of the sarcomere

Answer 30

center

Question 31

release of the myosin heads from the actin will occur when another -- binds to the myosin heads

Answer 31

ATP

Question 32

T/F: smooth muscle can be found in many parts of the body, including the bladder, digestive tract, reproductive tract, and surround blood vessels

Answer 32

true

Question 33

cells that compose smooth muscle contain a - nucleus

Answer 33

single

Question 34

smooth muscle contains actin and myosin but it is not as organized as -- which is why smooth muscles lacks striations

Answer 34

sacromeres

Question 35

the autonomic branch of the peripheral nervous system -- smooth muscle via sympathetic and parasympathetic stimulation, producing involuntary contractions

Answer 35

innervates

Question 36

smooth muscle can perform -- activity, meaning it can contract without stimulation from the nervous system

Answer 36

myogenic

Question 37

cardiac muscle is only found in the -- of the heart

Answer 37

myocardium

Question 38

cardiac muscle is -- due to the presence of sarcomeres, but it is not multinucleated like skeletal muscle

Answer 38

striated

Question 39

T/F: like smooth muscle, cardiac muscle is innervated by the autonomic branch of the peripheral nervous system and performs myogenic activity

Answer 39

true