Lab 5 Muscle Twitches

Question 1

functional unit of a contraction

Answer 1

sarcomere

Question 2

thin filament

Answer 2

actin

Question 3

thick filament

Answer 3

myosin

Question 4

actin contains these two things

Answer 4

troponin and tropomyosin

Question 5

muscle contraction blank muscle while blank slides over blank

Answer 5

shortens, actin, myosin

Question 6

single quick contraction of muscle

Answer 6

simple twitch

Question 7

three phases of contraction

Answer 7

latent, contraction, relaxation

Question 8

four events of latent period

Answer 8

stimulus applied, ach released into synaptic cleft, ach binds to receptors on muscle, depolarization along sarcolemma, action potential, action potential goes down t tubules through the sarcoplasmic reticulum, calcium ions are released into sarcoplasm, calcium ions bind to troponin

Question 9

latent period looks like blank on graph

Answer 9

flat line

Question 10

contraction is the blank

Answer 10

formation of cross bridges between actin and myosin

Question 11

longest phase

Answer 11

relaxation phase

Question 12

why is relaxation phase longest

Answer 12

active transport requires atp so it is most complex

Question 13

event during relaxation phase

Answer 13

calcium ions removed from troponin and pumped back into sarcoplasmic reticulum

Question 14

spatial summation is aka

Answer 14

recruitment

Question 15

muscle is made of many blank units

Answer 15

motor

Question 16

motor unit goes by the blank law

Answer 16

all or none

Question 17

each motor unit has a different blank

Answer 17

threshold

Question 18

strength of a contraction is due to the blank of the blank

Answer 18

sum, motor units

Question 19

an increase in strength of muscle contraction due to summation brought about by increasing strength of the stimulus by recruiting more motor units

Answer 19

spatial summation

Question 20

temporal summation is aka

Answer 20

tetanus

Question 21

individual fibers contract more blank if stimuli come blank together

Answer 21

strongly, closer

Question 22

tetanus is due to increasing blank of stimulus

Answer 22

frequency

Question 23

response of a skeletal or cardiac muscle to one single action potential

Answer 23

twitch

Question 24

place where the nerve enters the body of that muscle

Answer 24

motor point