Distinguish Red muscle fibres and white muscle fibres.

What are the functions of the vertebral column?

Differentiate pelvis of male and female

Differentiate between actin and myosin filament.

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?