The muscle layer of the heart is the

Which of these is not a function of the cell membrane?

A) Holding the cell together B) Regulation of what moves into and out of the cell C) Identifying the cell D) Protein synthesis

Binding sites on the surface of actin allow the formation of cross-bridges with molecules

of A) ATP. B) tropomyosin. C) troponin. D) myosin.

What cranial nerve causes movements of the tongue involved in speaking, manipulating food and swallowing?

A) facial B) hypoglossal C) trigeminal D) vagus

Melatonin, a hormone made by this gland, controls our diurnal (daily) cycle

A) pituitary B) pineal C) thyroid D) thymus