Transport System

The regulation of heartbeat is related to blood pH. (True/False)

• True

• False

The cardiovascular system is also known as the ______ system.

• Digestive

• Respiratory

• Transport

• Nervous

How many chambers does the human heart have?

• 2

• 3

• 4

• 5

The circulatory fluid in the human body is known as ______.

• Water

• Plasma

• Blood

• Lymph

What is the role of the semilunar valve?

• Prevents backflow into the atria

• Prevents backflow into the ventricles

• Regulates blood flow to the lungs

• Regulates blood flow to the brain.

Atrial walls are ______ than ventricular walls.

• Thicker

• Thinner

• The same thickness

Fill in the blank: The phase of ventricular systole and atrial diastole takes about _______ seconds to complete.

• 0.1

• 0.3

• 0.4

Which valves close to prevent backflow of blood from ventricles to atria during ventricular systole?

• Semilunar valves

• AV valves

• Both A and B

• None

During which phase do the atria fill with blood?

• Ventricular systole

• Atrial systole

• Atrial and ventricular diastole

• None of the above.

The QRS complex in an ECG indicates the depolarization of which part of the heart?

• A) Atria

• B) Ventricles

• C) SA node

• D) AV node