Heart Valve:
Why Are There Valves in the Heart?

Each heart valve has the same important job: To make sure that blood always flows in one direction, never flowing backward.  The human heart contains four heart valves.

make sure that blood always flows in one direction

20170425 heart valve
(Click to Enlarge)

What are heart valves made of?
The answer is:  Heart valves consist of papillary muscles, which are a type of cardiac muscles.

Next Generation Science Standards:

MS-LS1-3 Use argument supported by evidence for how the body is a system of interacting subsystems composed of groups of cells.

HS-LS1-2 Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.

HS-LS1-3 Plan and conduct an investigation to provide evidence that feedback mechanisms maintain homeostasis.

What Science Does this Comic Teach?

Unit: Anatomy

⇒Chapter: Circulatory System

⇒Topic: Heart Valve

Additional Information

Ventricle

A ventricle is a chamber of the heart that is responsible for pushing blood out of the heart.  The human heart has two ventricles–1 right ventricle and 1 left ventricle.

Atrium

An atrium is a chamber of the heart that is responsible for receiving blood into the heart.  The human heart has two atria (atria: plural form of atrium)–1 right atrium and 1 left atrium.

Cardiac Muscle

Cardiac muscle is one of the 3 major types of muscles: cardiac muscle, skeletal muscle, and smooth muscle.  Cardiac muscle is responsible for the transfer of blood and makes up the heart.

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