muscular system

Question 1

fascia

Answer 1

sheet of fibrous connective tissue that encloses a muscle

Question 2

tendon

Answer 2

cord like or band like mass of white fibrous connective tissue that connects a muscle to a bone

Question 3

myofibrils

Answer 3

contractile fibers within muscle cells

Question 4

myosin

Answer 4

protein that, with actin, contracts and relaxes muscle fibers

Question 5

actin

Answer 5

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

Question 6

sarcomeres

Answer 6

structural and functional unit of a myofibril

Question 7

motor neuron

Answer 7

neuron that transmits impulses from the central nervous system to an effector

Question 8

origin

Answer 8

end of a muscle that attaches to a relatively immovable part

Question 9

insertion

Answer 9

end of a muscle attached to a moveable part

Question 10

threshold stimulus

Answer 10

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

Question 11

twitch

Answer 11

a brief muscular contraction followed by relaxation

Question 12

muscle tone

Answer 12

contraction of some fibers in skeletal muscle at any given time

Question 13

latent period

Answer 13

time between the application of a stimulus and the beginning of a response in a muscle fiber

Question 14

refractory period

Answer 14

time period following stimulation during which a neuron or muscle fiber will not respond to a stimilus

Question 15

synaptic cleft

Answer 15

a narrow extracellular space between the presynpatic and postsympatic neurons

Question 16

neurotransmitters

Answer 16

chemical that an axon end secretes to stimulate muscle fiber contractions