When body temperature rises, a center in the brain initiates physiological changes to decrease the body temperature. This is an example of

Which of the following criteria must be met for the heart to function efficiently?

a. Excitation and contraction of each heart chamber should be coordinated to ensure efficient pumping. b. The atria should be excited and contract before the onset of ventricular contraction to ensure that ventricular filling is complete. c. The right side of the heart should contract first to ensure that oxygenated blood is delivered to the heart before the left side contracts. d. Both a and b e. Both b and c

The type of glial cell that plays a critical role in the formation of CSF is the _________ cell

Fill in the blank with correct word.

When is a conceptus considered to be an embryo?

A. When the trophoblast and embryoblast have differentiated from each other B. As soon as the first traces of all the organ systems are present C. When the three primary germ layers have formed D. When the egg is fertilized by the sperm E. After the conceptus has implanted in the uterine wall

The primary respiratory control center is located in the

A. cerebellum. B. pons. C. midbrain. D. medulla oblongata.