The driving age should be raised up to 18 because teens can be a little careless. Driving at the age of 18 is a more mature age for teens because they can have more responsibility. Teens should not be driving at the age of 16 because they could be texting and driving or drinking and driving with some friends.
During contraction, the smooth-muscle cell's intermediate filaments help to draw the cell up, like closing a drawstring purse. Calcium ions regulate contraction in smooth muscle, but they do it in a slightly different way than in skeletal muscle: Calcium ions come from outside of the cell. Calcium ions bind to an enzyme complex on myosin, called calmodulin-myosin light chain kinase.
Smooth muscles are used in involuntary actions, which a person doesn't consciously control, like digesting food. Cardiac muscles are found in the heart, and control the actions of the heart, like pumping blood.They are a form of smooth muscle.They're all similar in that they're all a type of muscle, all of them contract and expand to complete their jobs, and they all control various forms of movement. cardiac and skeletal muscles have one thing in common, that is they are both striated in contrast to the smooth muscles commonly found in the GIT. however the main diffe â¦ rence between them is that cardiac muscles function involuntarily while skeletal muscles are under conscious control.