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:

Which of the following carry venous blood?

Match each of the below with its correct answer.

The basic unit of the nervous system is called __________.