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ORGANS AND THEIR
FUNCTIONS
LUNGS
LIVER
SMALL
INTESTINES
LARGE
INTESTINES
HEART
STOMACH
Introduces oxygen
into the blood and
expels carbon dioxide
through breathing.
Filters toxins from the
blood, stores energy,
and produces bile to
aid in the digestion of
fats.
Absorbs nutrients
from digested food
and flows them into
the blood.
Absorbs water from
food waste and
forms solid waste
(feces).
Pumps oxygen-rich
blood throughout the
body, ensuring
steady circulation.
Breaks down food
into a finer form, and
starts the digestive
process with
stomach acid.
1
3
5
6
2
4
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FAQs on Infographics: Human Body: Organ Systems - Science for Class 3

1. What are the main organ systems in the human body?
Ans. The main organ systems in the human body include the circulatory system, respiratory system, digestive system, nervous system, muscular system, skeletal system, endocrine system, urinary system, immune system, and reproductive system. Each system has specific functions that contribute to overall health and well-being.
2. How do organ systems work together in the human body?
Ans. Organ systems work together through complex interactions to maintain homeostasis and support life. For example, the respiratory system provides oxygen to the circulatory system, which then transports it to cells throughout the body. Similarly, the digestive system breaks down food into nutrients that the circulatory system distributes to nourish cells.
3. What is the function of the circulatory system?
Ans. The circulatory system, also known as the cardiovascular system, is responsible for transporting blood, nutrients, oxygen, carbon dioxide, and hormones throughout the body. It plays a crucial role in maintaining temperature and pH balance while helping to protect the body from infection.
4. Why is the nervous system important?
Ans. The nervous system is essential for coordinating body activities and responses to external stimuli. It allows communication between different parts of the body and processes sensory information. The brain, spinal cord, and nerves work together to control movements, thoughts, and emotions.
5. What role does the digestive system play in the human body?
Ans. The digestive system is responsible for breaking down food into smaller components, allowing the body to absorb nutrients and eliminate waste. It includes organs like the mouth, stomach, intestines, liver, and pancreas, which all work together to ensure proper digestion and nutrient absorption.
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