The correct answer is C. Heart.
The heart is a muscular organ that pumps blood throughout the body. It is located in the chest, between the lungs. The heart is divided into four chambers: two atria and two ventricles. The atria are the upper chambers, and the ventricles are the lower chambers.
The heart beats in a regular rhythm. The sound of the heartbeat is caused by the closing of the valves between the chambers of the heart. The first sound, “lub,” is caused by the closing of the mitral and tricuspid valves. The second sound, “dub,” is caused by the closing of the aortic and pulmonary valves.
The heart is a vital organ, and its function is essential for life. If the heart stops beating, death will occur within minutes.
The liver is a large organ that is located in the upper right abdomen. It is responsible for many important functions, including:
- Metabolism
- Detoxification
- Blood clotting
- Bile production
The kidney is a bean-shaped organ that is located in the lower back. It is responsible for many important functions, including:
- Urine production
- Blood pressure regulation
- Red blood cell production
- Vitamin D production
The lung is a spongy organ that is located in the chest. It is responsible for breathing. The lungs take in oxygen from the air and deliver it to the blood. The blood then carries the oxygen to all parts of the body.
The liver, kidney, and lung are all important organs, but they do not produce the sound “lub-dub.” The sound “lub-dub” is produced by the heart.