Olympiad Test Level 2: Our Body and Health- 2 - Class 4 MCQ

Dermatologist is a skin specialist, psychiatrist treats mental illness, cardiologist deals in problems of cardiovascular system and nephrologist treats kidney problems.

The kidneys remove waste products from the blood, including:

• Urea: A waste product formed when the body breaks down proteins.
• Water: Excess water that the body doesn't need.
• Salts: Excess salts or electrolytes that are not required by the body.

These waste products are then excreted in the form of urine. The kidneys help maintain the balance of fluids and salts in the body.

When we smell food being cooked, it helps us know what it will taste like. Our nose and tongue work together to give us the full experience of flavor. So, the smell of the food is connected to how we taste it.

Glucose is a quick source of energy. When a runner consumes glucose before a race, it gets absorbed into the bloodstream and provides an instant boost of energy, helping the runner perform better during the race.

The circulatory system of arteries, veins and capillaries is approximately 60,000 miles long.

Thermometer is used to measure the temperature of body, stethoscope is used for listening the sound of heart, sterilizer kills unwanted micro-organisms and nebulizer is used for asthma patients.

The nervous system includes the brain and spinal cord. It is responsible for controlling and coordinating all the activities in the body, including receiving and responding to sensory information, and regulating bodily functions.

• Muscular system: Involves muscles, responsible for movement.
• Digestive system: Includes organs that help in breaking down food and absorbing nutrients.
• Respiratory system: Includes organs like the lungs, responsible for breathing and gas exchange.

The correct option is A: Cells → Tissues → Organs → Organ Systems → Organism.
This is the correct sequence of organization in living organisms. Cells are the basic building blocks of life. A group of similar cells forms a tissue. Multiple tissues combine to form organs. A group of organs that work together for a specific function makes an organ system, and all organ systems together form an organism.

Bones provide the structure for our bodies. The adult human skeleton is made up of 206 bones.

• A. True: Bones are indeed made up of calcium, which provides them with strength and structure.
• B. False: Arteries do not connect capillaries and veins. Instead, arteries carry blood away from the heart, and veins carry blood back to the heart. Capillaries connect arteries and veins at the tissue level.
• C. True: Ureters do not store urine; they are tubes that transport urine from the kidneys to the bladder, where urine is stored temporarily.