Lab worksheet 9 part B

When a muscle fiber contracts, the I bands diminish in size, the H zones disappear, and the A bands do not diminish in length

• True

• False

The sarcoplasmic reticulum or SR functions in calcium storage

• True

• False

Holding your head upright without bringing it down or back is an example of flexion

• True

• False

Holding your head upright without bringing it down or back is an example of extension?

• True

• False

Why is calcium so important for muscle contraction?

A student wrote down the following steps of muscle contraction. Select the list that is correct

• 
• 
• 
• 

Which number identifies the I band

• 1

• 2

• 8

• 4

• 6

Which number identifies the A band

• 1

• 2

• 8

• 4

• 6

Which number identifies the H zone

• 1

• 2

• 8

• 4

• 6

Which number identifies the Z disc

• 1

• 2

• 9

• 4

• 6