lecture exam 2

Question 1

1st phase number 1

Answer 1

ACH is released at motor endplate

Question 2

1st phase number 2

Answer 2

ACH receptor is NA2 transporter= Na influx

Question 3

1st phase number 3

Answer 3

NA2 influx/electrical charge signals SR to release CA2 into sarcoplasm (ca2 + efflux)

Question 4

1st phase number 4

Answer 4

troponin binds CA2+ & pushes tropomyosin away from myosin binding sites on actin

Question 5

2nd phase number 1

Answer 5

myosin heads grab an ATP and bind exposed myosin binding on actin=cross bridge

Question 6

2nd phase number 2

Answer 6

myosin head racher or swivel towards the m-line (myomesin) the pulling process is called POWER STRKE

Question 7

2nd phase number 3

Answer 7

myosin heads grabs another ATP to release= release

Question 8

2nd phase number 4

Answer 8

repeat until motion is complete (voluntary)

Question 9

2nd phase number 5

Answer 9

filaments slide to contracted position

Question 10

3rd phase number 1

Answer 10

acetylcholinesterase (ACHE) destroys the ach

Question 11

3rd phase number 2

Answer 11

ach receptor (na+ transport) closes

Question 12

3rd phase number 3

Answer 12

na+/k+ ATPase resets gradient

Question 13

3rd phase number 4

Answer 13

gradiant being, reset signals SR to “suck up” ca+2 using culsequestrin

Question 14

3rd phase number 5

Answer 14

troponin no longer pushes on tropomyosin

Question 15

3rd phase number 6

Answer 15

tropomyosin returns to cover myosin binding sites on actin

Question 16

3rd phase number 7

Answer 16

filaments slide back to relaxed position