__________ build bone, taking calcium out of the blood stream and putting it back into the bone.

__________ glands secrete hormones internally; whereas __________ glands secrete onto an epithelial surface.

With reference to the collecting tubules: __________ is removing water from the tubules and returning it to the venous system.

Carbon dioxide is eliminated and oxygen replenished in the __________ circuit.

Match each of the below with its correct answer.

Correctly match the following, using each answer only once.

Enclosing an object to digest it is called __________.

Which of the following are cell fragments of a megakaryoctes?

The forward movement of food by muscle constriction is called __________.

The digestive tract have several ways of increasing absorptive surfaces. They include: