Human Body Quiz

Humans are classified as:

• Exothermic organisms

• Cold-blooded organisms

• Endothermic organisms

• Passive organisms

Which of the following delivers nutrients and oxygen to every cell in the body?

• Nervous system

• Cardiovascular system

• Digestive system

• Respiratory system

What are the three main components of the cardiovascular system?

• Brain, lungs, and heart

• Blood, vessels, and heart

• Blood, liver, and kidneys

• Veins, lungs, and brain

How many chambers does the human heart have?

• 2

• 3

• 4

• 5

Which ventricle pumps blood into the pulmonary (lung) circulation?

• Left atrium

• Left ventricle

• Right atrium

• Right ventricle

Which layer of the heart wall is made of cardiac muscle tissue?

• Epicardium

• Endocardium

• Myocardium

• Pericardium

What is the primary pacemaker of the heart?

• AV node

• Bundle of His

• SA node

• Purkinje fibers

What happens during diastole?

• The heart contracts

• Blood is pushed out of the heart

• The heart fills with blood

• The valves close

Which valve prevents backflow of blood from the right ventricle to the right atrium?

• Mitral valve

• Tricuspid valve

• Aortic valve

• Pulmonary valve

Which of the following directly determines blood pressure?

• Blood color and type

• Pulmonary gas exchange

• Cardiac output and vessel resistance

• Red blood cell count