Question

According to the sliding filament model, binding sites on actin open when _, allowing the myosin head to bind. calcium ion levels fall creatine phosphate levels rise myosin levels rise calcium ion levels rise ATP levels rise Question 5 2 pts If cardiac muscle cells were prevented from undergoing aerobic metabolism, they ultimately would stop contracting undergo glycolysis synthesize ATP start contracting not be affected

Answer 1

1.Answer- calcium level rises

According to the sliding filament model, the muscle contraction occurs due to cross bridging between actin and myosin.The increase in the calcium in the sarcoplasm binds to troponin and exposes the site at the actin filament for the interaction with myosin head and the presence of ATP (for sustaining the contraction) causes muscles to contract.

2.Stop contracting

If the cardiac muscles were prevented from undergoing aerobic metabolism, it was unable to generate the ATP through glycolysis and stopped contracting .In normal aerobic condition,the abundant number of mitochondria in the cardiac muscles lead to generation of ATP molecules through glycolysis ,which is used in the cardiac muscle contraction.