Q&A for How to Draw the Internal Structure of the Heart

The human heart is roughly the size of a large fist. The human heart weighs about 10 to 12 ounces in men, and about 8 to 10 ounces in women.

The muscles are drawn as thick lines in the cross-section and the outside is completely made out of muscles. There is no need to specifically draw muscles, as they are already incorporated in the diagram.

An octopus has three hearts. One heart is to circulate the blood around the body, while the other two are for pumping the blood to the gills.

Because it collects deoxygenated blood from entire body and send it to lungs to get the blood oxygenated. After this, oxygen-rich blood is pumped by the heart to the rest of the body.

No. Main function of valve is to prevent back flow of blood. This is because blood pressure in veins is very low (compared to arteries). There is no need of valves in the arteries because the blood pressure usually varies between 70-110 mm Hg.

Yes, this is the case with every human on Earth! The right atrium is larger than the left atrium and the right ventricle is larger than the left ventricle. This is because the left side of the heart has thicker walls than the right side.

Use a sharp pencil, keep an eraser handy, and don't be scared of mistakes.

The two vena cavas perform similar functions: the superior vena cava returns oxygen-depleted blood to the heart from the upper body; the inferior vena cava does the same thing for the lower body.