Olympiad Test: Human Body -1 - Class 4 MCQ

The digestive process starts in your mouth when you chew. Your salivary glands make saliva, a digestive juice, which moistens food, so it moves more easily through your esophagus into your stomach.

Molars are specially designed for crushing and chewing plant foods into easily swallowable and digestible pieces. They also help to maintain the proper positioning of the jaws. They enable them to slice and grind their food efficiently. 

Blood carries oxygen to all body parts.

The respiratory system consists of all the organs involved in breathing. These include the nose, pharynx, larynx, trachea(windpipe), bronchi, and lungs.

Kidneys belong to the excretory system. The organs of the excretory system include the kidneys, renal pelvis, ureters, bladder and urethra.

The brain controls what you think and feel, how you learn and remember, and the way you move and talk. But it also controls things you're less aware of — like the beating of your heart and the digestion of your food.

Running will increase our heart rate as it requires more energy from our body which needs quick pumping of blood from the heart.

The lungs and respiratory system allow us to breathe. They bring oxygen into our bodies (called inspiration, or inhalation) and send carbon dioxide out (called expiration, or exhalation). This exchange of oxygen and carbon dioxide is called respiration.

The innermost layer or lining (mucosa) contains the glands that release digestive juices. This is the first and innermost layer or lining. It contains the glands that release digestive juices. These are called hydrochloric acid and pepsin

The digested food is absorbed into the blood in the human body. After digestion, the absorption occurs in the small intestine through the finger-like projections called villi present on the wall of the intestine.

The small intestine absorbs digested food and sends it to the blood in our body, which transfers it to various parts of our body.

C in the diagram represents Urinary Bladder, where the urine is stored before releasing.

An image of kidney (brown coloured)

The nervous system consists of the brain, spinal cord, sensory organs and all of the nerves that connect these organs with the rest of the body. Together, these organs are responsible for the control and coordination of the activities of all the systems in our body.

The two lower chambers are called ventricles

The image shows the rib cage, which is the bony structure in the chest that protects vital organs like the lungs and heart. It consists of ribs, the sternum (breastbone), and thoracic vertebrae.

Anus is the opening at the lower end of the digestive tract through which solid waste is excreted.

Adults have more teeth than children; most adults have 32 teeth.

The organ in the image is: lungs 

- Rib cage: A structure made of bones that protects organs like the heart and lungs.
- Brain: An organ inside the skull, responsible for controlling body functions and processes.
- Heart: A muscular organ that pumps blood throughout the body.
- Lungs: Organs that facilitate breathing by exchanging oxygen and carbon dioxide.
The odd one out is the rib cage. It is a structural part of the body, not an organ. The others are organs with specific functions.