How does an isotonic contraction take place?

Distinguish Red muscle fibres and white muscle fibres.

Name the regions of the vertebral column and the number of vertebrae present in them

What are the functions of the vertebral column?

What are Cartilaginous joints

Differentiate pelvis of male and female

What are synovial joints?

Differentiate between actin and myosin filament.

Differentiate between A - band and I - band.

An exhausted student was attending a lecture. After 30 minutes or so, he lost interest and he let go with a tremendous yawn. To his great distress he couldn't close his mouth-his lower jaw was locked open. What do you think would have caused it?