Circulatory System

Which of the following describes systole during heartbeat

• Closure of tricuspid and bicuspid valve

• Closure of semilunar valve

• Relaxation of ventricle

• Contraction of ventricle

As the blood reaches the lungs, what is removed from the blood?

• oxygen

• carbon dioxide

• red blood cells

• white blood cells

Identify the structure pointed by the arrow

• Left atrium

• Right atrium

• Left ventricle

• Right ventricle

What does Deoxygenated mean?

• Oxygen-rich
• Blood flow
• Oxygen-poor
• Water Flow

Identify the structure pointed by the arrow

• Left atrium

• Right atrium

• Left ventricle

• Right ventricle

About how big is the human heart?

• the size of your nose

• the size of your foot

• the size of your fist

• the size of your ear

What do Red-Blood cells do?

• Carry oxygen from the lungs to the body cells and  transport carbon dioxide from the cells back to the lungs
• keeps blood flowing in one direction to the heart and prevent blood from flowing backwards
• Collects  blood from the capillaries and drain it into the veins
• Bring nutriients to the cells and carries away waste materials.

What is the main organ of the circulatory system?

• small intestine

• bone

• lungs

• heart

What does blood do?

• Carries Water to cells
• Carries Oxygen to cells
• Carries Food to cells
• All of the above 

How does the heart work?

• It pumps blood first to the lungs, back to the heart and then around the rest of the body.

• It pumps blood first to the rest of the body, back to the lungs and then to the heart.

• It pumps blood around the rest of the body, back to the heart and then to the lungs,