Exam 2

Question 1

after nervous stimulation ends, so does

Answer 1

action potential

Question 2

after nervous stimulation ends, no calcium release from

Answer 2

SR

Question 3

during relaxation no calcium bind to

Answer 3

troponin

Question 4

during relaxation tropomyosin does not move and stays in place

Answer 4

blocking binding site

Question 5

what is ACh destroyed by

Answer 5

acetylcholinesterase enzyme

Question 6

what does AChE do

Answer 6

bind to receptor and prevents continues muscle fiver contraction without another stimulation

Question 7

South American Indian’s Arrowhead Poison

Answer 7

curare

Question 8

curare is used for

Answer 8

Hunting & Therapeutic Purposes

Question 9

what does curare weaken

Answer 9

skeletal muscle

Question 10

curare binds to what and blocks ACh

Answer 10

acetylcholine receptor

Question 11

do muscles respond to stimulation during curare

Answer 11

no

Question 12

Mimics Locked in syndrome (Paralysis of all Skeletal muscle VOLUNTARY Contraction)

Answer 12

curare

Question 13

curare leads to

Answer 13

Asphyxiation & Paralysis  DIE

Question 14

small amount of curare are used in

Answer 14

intubation and surgery as a paralyzing agent

Question 15

curare is also used for treatment for

Answer 15

Tetanus & Strychnine Poisoning

Question 16

myasthenia gravis is due to

Answer 16

Ach Receptors being destroyed by AUTOIMMUNE REACTION (Females 20-40)

Question 17

when thymus is removed in myastenia gravis it will

Answer 17

return to normal

Question 18

Motor Unit

Answer 18

Functional contractile
unit in Skeletal Muscle

Question 19

ALL Muscle fibers of Motor Unit

Answer 19

contract at the same time

Question 20

The Motor Nerve Axon branches at
Terminal and

Answer 20

innervates several muscle
fibers

Question 21

Motor Units do NOT have same ratio of muscle fibers and

Answer 21

nerve axons

Question 22

muscle func depends on

Answer 22

ratio

Question 23

large=

Answer 23

many fibers/ axon

Question 24

small=

Answer 24

few fibers/ axon

Question 25

fine motor control=

Answer 25

smaller motor units

Question 26

strength=

Answer 26

larger motor units

Question 27

fine motor control would be

Answer 27

fingers, tongue, eye muscles

Question 28

strength motor units are found

Answer 28

thigh and leg muscles, shoulder and arm muscles, back, and abdomen

Question 29

skeletal muscle fibers contract in

Answer 29

twitches

Question 30

twitch lasts

Answer 30

20-40 milliseconds

Question 31

all muscle fibers innervated contract

Answer 31

simultaneously and maximally

Question 32

twitch is time from

Answer 32

SR releasing calcium, cross bridge forms, power stroke, sr reuptakes calcium, cross bridge, power stroke stops

Question 33

after death there is no

Answer 33

ATP production, and cross bridges not detach

Question 34

muscle stiffening between what hours

Answer 34

3-4 hours post mortem

Question 35

when are you the most rigid in rigor mortis

Answer 35

12 hours

Question 36

when does stiffness decrease

Answer 36

48-60 hours

Question 37

in rigor mortis was causes all cross bridges to form

Answer 37

calcium influx into muscle cells

Question 38

why do cross bridges not detach

Answer 38

no atp