What is the function of the chordae tendineae and papillary muscles?

They prevent the atrioventricular valves from inverting (blowing backwards) into the atria during ventricular contraction.

Which of the following correctly matches a heart structure with its function?

Aorta: Transports oxygenated blood to the body.

Epicardium, myocardium, endocardium.

I can identify the major anatomical structures of a sheep heart and explain their functions.

1
The heart's chambers include the right atrium, right ventricle, left atrium, and left ventricle, which are separated by atrioventricular valves.
2
The tricuspid valve (or right atrioventricular valve) and the bicuspid (or mitral or left atrioventricular valve) are attached to chordae tendineae and papillary muscles to prevent backflow of blood.
3
The three layers of the heart are the epicardium, the thick myocardium, and the thin endocardium, with plate-like structures called trabeculae found within the muscle.