Human Heart Model, 2 Parts

Quick Answer: The 2 part heart model is a human heart model that separates into two pieces, so students can see inside as well as outside. Opening it reveals the chambers, the valves between them and the septum dividing the left and right sides.

What Opening the Heart Reveals

A heart model in two parts is usually divided so that the front wall lifts away from the rest, exposing the interior; the number of parts is stated in the title, while the line along which this model divides should be confirmed. Once open, the four chambers can be compared directly, and the most striking difference is wall thickness: the left ventricle wall is several times thicker than the right, because it pumps blood around the whole body.

Inside, the two kinds of valve look quite different. The atrioventricular valves, tricuspid on the right and mitral on the left, have flaps anchored by cord-like chordae tendineae to papillary muscles on the ventricle wall, which stop the flaps turning inside out when the ventricle contracts. The pulmonary and aortic valves are semilunar valves: three pocket-shaped cusps that fill and close when blood tries to flow back.

The interventricular septum, the wall between the ventricles, is also visible. Its thin upper membranous part is where a ventricular septal defect, the most common congenital heart defect, is often found, and on the right side of the interatrial septum a shallow depression, the fossa ovalis, marks the foramen ovale that carried blood before birth.

Applications

Comparing the thickness of the left and right ventricle walls
Showing the structure of atrioventricular and semilunar valves
Explaining the fossa ovalis and fetal circulation
Practical exams that ask students to identify internal structures

Specifications

Model of	Adult human heart
Parts	Two, per the listing title
Interior shown	Chambers, valves, septum and chamber wall thickness
Level	Secondary biology through first-year medical and nursing anatomy
Dividing line and size	Confirm at enquiry

Care & Handling

Open and close the 2 part heart model over a table, holding both halves, so no part is dropped.
Line up whatever pins or clips hold the halves before pressing them together.
Clean inner and outer surfaces with a soft damp cloth and dry them before reassembling.

Why Choose LabEquip

The two-part heart is a common choice for school and college labs that want students to see inside the heart without the complexity of a many-part model. LabEquip lists it with its biology lab products, alongside the 4 part heart for more detailed dissection. Ask via the contact page about size.

Frequently Asked Questions

What can be seen inside a 2 part heart model?

Opening it shows the chambers, the tricuspid and mitral valves with their chordae tendineae, the semilunar valves, the septum and the difference in wall thickness between the ventricles.

What are chordae tendineae?

They are fine tendinous cords linking the flaps of the tricuspid and mitral valves to papillary muscles. When the ventricles contract, they stop the valve flaps from being pushed back into the atria.

How do semilunar valves work?

Each has three pocket-shaped cusps. Blood leaving the ventricle pushes them flat against the vessel wall, and when the ventricle relaxes, backflowing blood fills the pockets and closes the valve.

What is the fossa ovalis?

It is a shallow oval depression on the septum between the atria. It marks the site of the foramen ovale, an opening that let blood bypass the lungs before birth and normally closes soon after.

Why choose two parts rather than four?

Two parts are quicker to open and reassemble and suit most secondary and introductory courses. A four-part model gives more views of the interior for advanced anatomy.

What is a ventricular septal defect?

It is a hole in the wall between the ventricles, present from birth. It lets blood pass from the left ventricle to the right, and the model helps students see where it occurs.

Last Updated: September 2026