In the nodal tissue of the human heart the last to get activated is/are:
1. SA node
2. AV node
3. AV bundle
4. Purkinje fibers

The central cardiac control region is in the _____ of the brain.

Heart murmurs are heart sounds produced when blood flows across one of the heart valves that are loud enough to be heard with a stethoscope. A common cause would be:
1. smoking which weakens the action of the valve
2. ineffective valves allowing blood to leak back through the valve
3. stress from higher blood pressure
4. ineffective signals from the AV node

Blood pressure is the pressure of blood against:
1. the left ventricle
2. the tissue of the organs
3. the capillaries of the lung
4. the wall of a blood vessel

Pulmonary veins return the oxygenated blood from the lungs to:

Erythrocytes in humans are destroyed mainly in:

The most common WBC under normal physiological conditions are:

Which of the following is the largest WBC?
1. neutrophils
2. monocytes
3. macrophages
4. lymphocytes

In a normal ECG, The T wave represents:

A resting heart rate of fewer than 60 beats per minute is:
1. tachycardia
2. bradycardia
3. flutter
4. fibrillation