Muscles

Question 1

Fascia

Answer 1

Sheet of fibrous connective tissue that encloses a muscle

Question 2

Aponeuroses

Answer 2

Sheet of connective tissue that attaches muscle to bone and fascia

Question 3

Myofibrils

Answer 3

Contractile fibers in muscle cells

Question 4

Sarcomere

Answer 4

Structural and functional unit of Myofibril

Question 5

Actin

Answer 5

Protein in a muscle fiber that forms filaments that slide between filaments of the protein myosin contracting muscle fibers

Question 6

Myosin

Answer 6

Protein that contracts and relaxes muscle fibers with actin

Question 7

Troponin

Answer 7

Protein that functions with tropomyosin to block muscle contraction until calcium ions are present

Question 8

Tropomyosin

Answer 8

Protein that blocks muscle contraction until calcium ions are present

Question 9

Transverse tubule

Answer 9

Membranous channel that extends inward from a muscle fiber membrane and passes through the fiber

Question 10

Sarcoplasmic reticulum

Answer 10

Membranous network of channels and tubules in a muscle fiber corresponding to ER

Question 11

Neuromuscular junction

Answer 11

Synapse between a motor neuron and skeletal muscle fiber

Question 12

Synapse

Answer 12

Functional connection between axon of one neuron and the dendrite or cell body of another of membrane of another cell type

Question 13

Neurotransmitter

Answer 13

Chemicals that an axon end secretes that stimulates a muscle fiber to contract or a neuron to fire an impulse

Question 14

Motor end plate

Answer 14

Specialized part of muscle fiber membrane at neuromuscular junction

Question 15

Motor unit

Answer 15

Motor neuron and associated muscle fibers

Question 16

Synaptic cleft

Answer 16

Narrow extracellular space between presynaptic and postsynaptic neurons

Question 17

Acetylcholine

Answer 17

Type of neurotransmitter transports nerve impulses across synapses

Question 18

Sliding filament theory

Answer 18

Mucked contract when actin and myosin filaments move past each other shortening the skeletal muscle

Question 19

Myoglobin

Answer 19

Pigmented compound in muscle tissue that stores oxygen

Question 20

Oxygen debt

Answer 20

Amount of o required following physical exercise to react accumulated lactic acid to form glucose

Question 21

Threshold stimulus

Answer 21

Stimulation level that must be exceeded to elicit a nerve impulse or a muscle contraction

Question 22

Latent period

Answer 22

Time between application of stimulus and beginning of response in muscle fiber

Question 23

Refractory period

Answer 23

Period following stimulation during which a neuron of muscle fiber will not respond to a stimulus

Question 24

Summation

Answer 24

Increased force of contraction by a skeletal muscle fiber when twitches occur before previous twitch relaxes

Question 25

Recruitment

Answer 25

Increase in number of motor units activated as stimulation intensity increases

Question 26

Tetanic contraction

Answer 26

Continues forceful muscular contraction without relaxation

Question 27

Muscle tone

Answer 27

Contraction of some fibers in skeletal muscle at any given time

Question 28

Peristalsis

Answer 28

Rhythmic waves of muscular contraction in the walls of certain tubular organs

Question 29

Smooth muscle

Answer 29

Type of involuntary muscle tissue in walls of hollow viscera

Question 30

Cardiac muscle

Answer 30

Specialized muscle tissue found only in heart

Question 31

Myofilaments

Answer 31

Filaments in myofibrils

Question 32

Thick filament

Answer 32

Myosin

Question 33

Thin filament

Answer 33

Actin

Question 34

Z lines

Answer 34

Appear at center of I bands | Have direct attachments to actin

Question 35

Tendon

Answer 35

Cordlike mass of white fibrous connective tissue that connects muscle to bone

Question 36

H zone

Answer 36

Consist only of thick filaments

Question 37

Crossbridge

Answer 37

Each myosin molecule consists of two twisted pristine stands with globular parts

Question 38

Lactic acid threshold

Answer 38

Anaerobic reactions break down glucose into Pyruvic acid which reacts to produce lactic acid

Question 39

Syncytium

Answer 39

When the heart contracts as a unit

Question 40

Calat-

Answer 40

Something inserted

Question 41

Erg-

Answer 41

Work

Question 42

Fasc-

Answer 42

Bundle

Question 43

-gram

Answer 43

Something written

Question 44

Hyper-

Answer 44

Over, more

Question 45

Inter-

Answer 45

Between

Question 46

Iso-

Answer 46

Equal

Question 47

Laten-

Answer 47

Hidden

Question 48

Myo-

Answer 48

Muscle

Question 49

Reticul-

Answer 49

A net

Question 50

Sarco-

Answer 50

Flesh

Question 51

Syn-

Answer 51

Together

Question 52

Tetan-

Answer 52

Stiff

Question 53

-tonic

Answer 53

Stretched

Question 54

-troph

Answer 54

Well fed

Question 55

Voluntar-

Answer 55

Ones free will