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The heart is in the thoracic cavity in the space between the two lungs. This space is called the

The impulse to begin each heartbeat comes from the

An animal’s first line of defense against potential disease-causing organism is the

The large blood vessel that brings deoxygenated blood from the body to the heart is the

Suppose m and n are integers such that  and .  Then   (Please enter your answer as an integer in the blank.)

Consider the Venn diagram: Which of the following sets represent(s) ? (1)

Let and be two integers. Then

(1) For any integers  and , if  and , then

(Please enter your answer as an integer in the blank.)

(1) For any integers  and , if  and , then . True or false? [a1] (2) There exist integers  and  such that ,  , and