Bio 220 Exam 2 UPDATED Study Guide
QUESTIONS AND CORRECT ANSWERS
what type of contraction is represented by each of the following events? -
CORRECT ANSWERS isotonic contraction:
- a sprinter leaves the starting block
- a mother lowers an infant into his crib
isometric contraction:
- this begins when a weightlifter pulls on a barbell and ends the moment the
barbell leaves the floor
- a man holds the door open for his date
- during this contraction, tension is building in the series-elastic elements
sort each movement by the type of motor unit used to achieve the movement -
CORRECT ANSWERS small motor units:
- writing a note
- playing a piano
- following words on a page with your eyes
large motor units:
- climbing stairs
- moving a piano
- sitting upright
match each event to the appropriate phase of a muscle twitch - CORRECT
ANSWERS latent period:
- immediately follows stimulation of the muscle
- internal but not external tension generated
, - excitation-contraction coupling
- depolarization occurs in the T tubule
contraction phase:
- internal and external tension generated
- sarcomeres shorten
- power-stroke occurs
- myofilaments slide over one another
relaxation phase:
- Ca2+ transported back into the sarcoplasmic reticulum
-muscle tension decreases
what type of contraction is represented by each of the following events? -
CORRECT ANSWERS isotonic eccentric contraction:
- a sprinter leaves the starting block
- a weightlifter puts a barbell back on the floor
- a mother lowers an infant into his crib
isotonic concentric contraction:
- a weightlifter pulls a barbell up to his waist
- a man pulls open a door for his date
which of the following describes twitch summation? - CORRECT ANSWERS
stimuli arrive at the muscle fiber at such a rate that the muscle fiber is
unable to completely relax between stimuli. sequential contractions exhibit an
equal contractive force that is greater than when the muscle fiber is allowed to
rest completely.
QUESTIONS AND CORRECT ANSWERS
what type of contraction is represented by each of the following events? -
CORRECT ANSWERS isotonic contraction:
- a sprinter leaves the starting block
- a mother lowers an infant into his crib
isometric contraction:
- this begins when a weightlifter pulls on a barbell and ends the moment the
barbell leaves the floor
- a man holds the door open for his date
- during this contraction, tension is building in the series-elastic elements
sort each movement by the type of motor unit used to achieve the movement -
CORRECT ANSWERS small motor units:
- writing a note
- playing a piano
- following words on a page with your eyes
large motor units:
- climbing stairs
- moving a piano
- sitting upright
match each event to the appropriate phase of a muscle twitch - CORRECT
ANSWERS latent period:
- immediately follows stimulation of the muscle
- internal but not external tension generated
, - excitation-contraction coupling
- depolarization occurs in the T tubule
contraction phase:
- internal and external tension generated
- sarcomeres shorten
- power-stroke occurs
- myofilaments slide over one another
relaxation phase:
- Ca2+ transported back into the sarcoplasmic reticulum
-muscle tension decreases
what type of contraction is represented by each of the following events? -
CORRECT ANSWERS isotonic eccentric contraction:
- a sprinter leaves the starting block
- a weightlifter puts a barbell back on the floor
- a mother lowers an infant into his crib
isotonic concentric contraction:
- a weightlifter pulls a barbell up to his waist
- a man pulls open a door for his date
which of the following describes twitch summation? - CORRECT ANSWERS
stimuli arrive at the muscle fiber at such a rate that the muscle fiber is
unable to completely relax between stimuli. sequential contractions exhibit an
equal contractive force that is greater than when the muscle fiber is allowed to
rest completely.
