During the excitation phase of the skeletal muscle cellcontraction, the following occurs:
1) the muscle fiber develops tension and shortens
2) the muscle fiber relaxes and returns to its originallength
3) nerve action potentials lead to muscle action potentials
A growing long bone in a child has only two types of cartilageat the epiphysis. These two areas are
1) elastic cartilage and epiphyseal plate
2) epiphyseal plate and epiphyseal line
3) primary and secondary ossification centers
4) articular cartilage and epiphyseal plate
During the building up and breaking down of a bone duringchildhood _______________:
1)osteoclast activity will increase and osteoblast activity willdecrease
2)osteoblast activity will increase and osteoclast activity willdecrease
3) both osteoblast and osteoclast activity will increase
