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.

Kidneys remove urea and excess water and salts from our body.

This is because the senses of smell and taste are linked.
Therefore, whenever we inhale the smell of food, we can feel its taste in our mouth.

Athletes take glucose just before the race because it provides instant energy.

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
The system that includes the brain and spinal cord is the nervous system. It is responsible for coordinating and controlling the body's activities and processes. Here is a detailed explanation of the nervous system:
Function
- The nervous system processes and interprets sensory information from the environment.
- It sends signals to muscles and glands to initiate appropriate responses.
- It regulates and maintains homeostasis, ensuring the body's internal environment remains stable.
- It enables communication between different parts of the body.
Components
1. Brain: The brain is the control center of the nervous system. It receives and processes information, initiates actions, and stores memories.
2. Spinal Cord: The spinal cord is a long bundle of nerves that extends from the base of the brain to the lower back. It relays messages between the brain and the rest of the body.
3. Nerves: Nerves are bundles of specialized cells called neurons that transmit signals between the brain, spinal cord, and the rest of the body.
4. Sensory Organs: The nervous system includes sensory organs such as the eyes, ears, nose, tongue, and skin, which gather information from the environment and send it to the brain for processing.
Divisions
The nervous system can be divided into two main parts:
1. Central Nervous System (CNS): This includes the brain and spinal cord. It processes and interprets information received from the sensory organs and coordinates the body's responses.
2. Peripheral Nervous System (PNS): This includes all the nerves outside of the CNS. It transmits signals between the CNS and the rest of the body.
Conclusion
The nervous system, which includes the brain and spinal cord, is responsible for controlling and coordinating the body's activities. It enables communication between different parts of the body and ensures the body functions properly.

Answer:
The correct option is A: Cells → Tissues → Organs → Organ Systems → Organism.
Explanation:
The organization of living organisms follows a hierarchical structure. Here is a detailed explanation of the correct sequence:
Cells:
- The basic structural and functional units of living organisms.
- Cells are the building blocks of life and carry out various functions.
Tissues:
- Cells of similar types come together to form tissues.
- Tissues are groups of cells that work together to perform a specific function.
Organs:
- Different types of tissues combine to form organs.
- Organs are structures composed of multiple tissues that work together to perform a specific function.
Organ Systems:
- Organs of related functions come together to form organ systems.
- Organ systems are groups of organs that work together to perform specific physiological functions.
Organism:
- The highest level of organization is the organism.
- An organism is a complete living entity capable of carrying out all the necessary life processes.
Therefore, the correct sequence is Cells → Tissues → Organs → Organ Systems → 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.

 

 

 

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