FuckThisNoise

Question 1

Step 1 of a muscle contraction

Answer 1

Sodium enters neuron via diffusion. Called depolarization

Question 2

Step 2 of a muscle contraction

Answer 2

Sodium channels close

Question 3

Step 3 of a muscle contraction

Answer 3

Potassium channels open

Question 4

Step 4 of a muscle contraction

Answer 4

Potassium channels close

Question 5

Step 5 of a muscle contraction

Answer 5

A sodium potassium pump moves sodium into the neuron and potassium out of it using ATP and returning to resting potential

Question 6

Step 6 of a muscle contraction

Answer 6

Action potential reaches the end of the motor neuron

Question 7

Step 7 of a muscle contraction

Answer 7

Calcium channels in the motor neuron open

Question 8

Step 8 of a muscle contraction

Answer 8

Calcium travels to the motor neuron

Question 9

Step 9 of a muscle contraction

Answer 9

The neuron releases the neurotransmitter ACH

Question 10

Step 10 of a muscle contraction

Answer 10

ACH enters the synaptic cleft

Question 11

Step 11 of a muscle contraction

Answer 11

ACH binds to receptors on the sarcolemma

Question 12

Step 12 of a muscle contraction

Answer 12

Ligand-gated sodium channels on the sarcolemma open

Question 13

Step 13 of a muscle contraction

Answer 13

The muscle cell is depolarized when sodium enters it

Question 14

Step 14 of a muscle contraction

Answer 14

Depolarization travels down the sarcolemma

Question 15

Step 15 of a muscle contraction

Answer 15

ACH broken down into acetic acid and choline

Question 16

Step 16 of a muscle contraction

Answer 16

Depolarization runs through T tubules and into SR

Question 17

Step 17 of a muscle contraction

Answer 17

Calcium ions travel from the terminal cisternae in the SR into the sarcoplasm

Question 18

Step 18 of a muscle contraction

Answer 18

Calcium binds to troponin on the actin.

Question 19

Step 19 of a muscle contraction

Answer 19

The calcium bind causes the rotation of tropomyosin

Question 20

Step 20 of a muscle contraction

Answer 20

The binding sites on the actin are uncovered

Question 21

Step 21 of a muscle contraction

Answer 21

Myosin binds to the actin at the binding site, forming a cross-bridge

Question 22

Step 22 of a muscle contraction

Answer 22

Myosin pulls the actin inwards

Question 23

Step 23 of a muscle contraction

Answer 23

ATP releases the myosin heads from the crossbridge to reset them

Question 24

Step 24 of a muscle contraction

Answer 24

Calcium released from troponin back to the SR

Question 25

Step 25 of a muscle contraction

Answer 25

The binding sites on the actin are covered by the tropomyosin