The correct answer is that the skeletal muscle will enter a state wherein actin and myosin cannot separate. In the presence of adequate ATP, ATP will act to detach the myosin head to actin then ATP will be hydrolyzed to ADP then the myosin head will attach to actin. In the absence of adequate ATP, there will be no ATP to detach the myosin head to actin therefore the actin and myosin cannot separate and muscles will be contracted and stiff. This happens in ATP depletion and muscle stiffness in dead persons called rigor mortis.<span />
Friction is a force that works against motion. While walking, friction helps us maintain our stability and prevents us from slipping. Friction also works the same way with cars and vehicles in general, preventing them from skidding and helping them stop when the brakes are applied. We also need friction to make a fire.
Answer:
It is called the S-A node, or rather sinus node.
I believe it’s b but correct me if I’m wrong
