Chapter 8 : Muscle Contraction and Relaxation

Question 1

Contraction step 1.

Answer 1

Acetylcholine rushes into the neuromuscular junction

Question 2

Contraction step 2.

Answer 2

Sarcolemma soaks up the Na+ (sodium ions)

Question 3

Contraction step 3.

Answer 3

Na+ ions make the inside of the cell positively charged while the outside is negatively charged

Question 4

Contraction step 4.

Answer 4

The difference in changes creates an action potential

Question 5

Contraction step 5.

Answer 5

Equalization of the action potential sweeps across the sarcolemma and into the T-tubules like and wave

Question 6

Contraction step 6.

Answer 6

This causes calcium ions (Ca+) to be released into the sarcoplasmic reticulum

Question 7

Contraction step 7.

Answer 7

Calcium exposes binding sites on the Actin filaments

Question 8

Relaxation step 1.

Answer 8

Acetylcholine is broken down by enzymes in the sarcolemma

Question 9

Relaxation step 2.

Answer 9

Calcium ions (Ca+) are reabsorbed by the sarcoplasmic reticulum

Question 10

Relaxation step 3.

Answer 10

Muscle returns to normal length