Question

question 11
lactic acid is produced in muscles that has less or no oxygen.
true
false
question 12
which molecule contains a binding site for crossbridge attachment?
actin
calcium
myosin
atp

Explanation:

For Question 11, during anaerobic respiration in muscles (when there is less or no oxygen), lactic - acid fermentation occurs and lactic acid is produced. For Question 12, in muscle contraction, myosin forms cross - bridges with actin, and actin has binding sites for crossbridge attachment.

Answer:

Question 11: True
Question 12: Actin