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ICSE Class 8 Biology Question 7 of 7

Circulatory System in Humans — Question 1

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Question 1

Given below is a diagram of human heart. Draw it in your notebook and label the following parts.

Given below is a diagram of human heart. Draw it in your notebook and label the following parts. Right auricle, Left Ventricle, tricuspid valve, bicuspid valve, pulmonary artery, pulmonary veins, inter-ventricular septum. Circulatory System in Humans, Living Science Biology Ratna Sagar Solutions ICSE Class 8.
  1. Right auricle
  2. Left Ventricle
  3. tricuspid valve
  4. bicuspid valve
  5. pulmonary artery
  6. pulmonary veins
  7. inter-ventricular septum
Answer

The below diagram shows the labelled parts of human heart:

Given below is a diagram of human heart. Draw it in your notebook and label the following parts. Right auricle, Left Ventricle, tricuspid valve, bicuspid valve, pulmonary artery, pulmonary veins, inter-ventricular septum. Circulatory System in Humans, Living Science Biology Ratna Sagar Solutions ICSE Class 8.
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Biology | Chapter 8: Circulatory SystemWeb Content

Circulatory System – Interactive Study Guide

Quick Overview

The circulatory system transports blood, oxygen, nutrients, and hormones throughout the body. It consists of the heart (pump), blood (transport medium), and blood vessels (pipelines).

Blood Components

ComponentFunctionKey Fact
Plasma (55%)Transports dissolved substances90% water, carries nutrients, hormones, waste
RBCCarry oxygenBiconcave disc, no nucleus, contain haemoglobin
WBCFight infectionsHave nucleus, larger than RBC, immune defence
PlateletsBlood clottingCell fragments, no nucleus

Blood Group Quick Reference

ABO System

O = Universal Donor (no antigens) | AB = Universal Recipient (no antibodies)

GroupAntigenAntibody
AAanti-B
BBanti-A
ABA & BNone
ONoneanti-A & anti-B

Heart – Quick Facts

  • 4 chambers: RA, RV, LA, LV
  • 4 valves: Tricuspid (R), Bicuspid (L), 2 Semilunar
  • Septum divides right (deoxy) from left (oxy)
  • Left ventricle = thickest wall

Double Circulation

Two Circuits

Pulmonary: RV → Pulmonary artery → Lungs → Pulmonary veins → LA

Systemic: LV → Aorta → Body → Vena cava → RA

Blood Vessels Comparison

ArteriesVeinsCapillaries
DirectionAway from heartTo heartConnect A to V
WallsThickThin1 cell thick
ValvesNoYesNo

Self-Test Questions

Test Yourself
  1. Why is the left ventricle wall thicker than the right?
  2. Draw and label the human heart.
  3. What is double circulation? Describe both circuits.
  4. Why is blood group O called universal donor?
  5. What is the function of valves in veins?

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