Human Body: Organ Systems- 2 - Class 3 MCQ

The organ shown in the diagram is responsible for the sense of smell. It helps in:

• Detecting different odours in the environment.
• Identifying smells that can trigger memories or emotions.
• Playing a role in the perception of flavour when eating.

The organ depicted in the diagram is the heart. The heart is a muscular organ responsible for pumping blood throughout the body.

The tongue is primarily responsible for the sense of taste. It helps in tasting different flavours like sweet, salty, sour, and bitter. The tongue also aids in chewing and swallowing food. Additionally, it plays a crucial role in speech by helping form words.

The organ depicted in the diagram is the lungs. Here's why:

• The lungs are part of the human respiratory system.
• Their main function is to exchange oxygen and carbon dioxide between the blood and the air.
• They are located in the chest cavity, protected by the ribcage.

The sense of smell is primarily associated with the nose. Here are some key points:

• The nose contains olfactory receptors that detect odours.
• These receptors send signals to the brain, allowing us to perceive different smells.
• This process is essential for identifying food, detecting danger, and enjoying fragrances.

In this context, option B is used mainly for the sense of smell.

The reproductive system enables the process of sexual reproduction, allowing for the creation of offspring and the continuation of the species.

The stomach is located in the upper abdomen, beneath the ribcage and on the left side of the body.

The human heart has four chambers. These chambers are essential for its function of pumping blood throughout the body. The four chambers are:

• Two atria (upper chambers) - the right atrium and the left atrium.
• Two ventricles (lower chambers) - the right ventricle and the left ventricle.

Each chamber plays a crucial role in circulating blood and maintaining proper oxygenation levels.

The kidneys are situated in the abdominal cavity, specifically in the retroperitoneal space, on either side of the spine.

Swallowing the food without chewing it is not a good habit. Chewing is an essential part of the digestion process as it breaks down food into smaller particles, making it easier for the digestive enzymes to work and facilitating nutrient absorption.