Circulatory System Basics

• Identify heart, blood, and blood vessels as parts of circulatory system.
• Understand blood transport of oxygen and nutrients.
• Know that heartbeat changes with activity.
• Relate circulation to healthy habits and sports.

Level 1 - Main parts

The circulatory system includes the heart, blood, and blood vessels. Heart acts like a pump.

Level 2 - What blood carries

Blood carries oxygen from lungs and nutrients from digested food to body cells. It also carries wastes away for removal.

Level 3 - Heartbeat and pulse

Heartbeat creates pulse felt at wrist or neck. During running, heart pumps faster to meet body demand.

Level 4 - Indian context

Children playing cricket or kho-kho feel pulse become faster after activity. Balanced diet with iron-rich foods (spinach, pulses, jaggery) supports healthy blood. Regular exercise and adequate sleep help maintain heart health from a young age.

NCERT anchor: Looking Around 4, Ch 26 — Defence Officer Wahida; Ch 21 — Food and Fun (body fitness and nutrient transport)

Pulse before and after jumps

Step 1 - Measure pulse for 30 seconds at rest.
Step 2 - Do jumping for one minute.
Step 3 - Measure pulse again for 30 seconds.
Step 4 - Compare counts and explain heart response.
Answer: Pulse rate increases after exercise.

Transport function matching

Step 1 - List items: oxygen, nutrients, carbon dioxide.
Step 2 - Match what blood delivers to cells.
Step 3 - Match what blood carries away from cells.
Step 4 - Summarize circulation role.
Answer: Blood delivers oxygen/nutrients and removes wastes.

• Name three parts of circulatory system.
• What happens to pulse after running?
• Which organ pumps blood?
• What two useful things does blood transport to body cells?
• Stretch: Plan a one-week healthy-heart routine with play time, sleep schedule, and food choices.

Revision tip: Heart pumps blood so oxygen and nutrients reach every body part.

Open the Practice tab for graded questions on Circulatory System Basics.