Heart Structure & Double Circulation

CONCEPTUAL

Science›Organisms & Life Processes|Ages 12—13|ID: mt_TR2oTy9c2M

Describe the structure of the heart (four chambers, valves, coronary arteries) and explain how it pumps deoxygenated blood to the lungs and oxygenated blood to the body in a double circulatory system

Mastery Evidence

Labels a diagram of the heart showing atria, ventricles, valves, aorta, vena cava, and pulmonary vessels
Traces the route of blood through the double circulatory system
Explains the role of valves in preventing backflow
Compares arteries, veins, and capillaries

Assessment Prompt

“If [child] felt their heartbeat, could they describe what the heart is doing — explaining the two sides of the heart, where the blood goes from each side, and why we need a double loop?”

Curriculum Standards2 alignments

KS3.Sci.Bio.GasExchange.4The national curriculum in England

Structure and function of the heart

the structure of the heart and how it functions

Science · KS3

KS3.Sci.Bio.GasExchange.5The national curriculum in England

Role of blood

the role of the blood in transporting substances around the body

Science · KS3

Prerequisites2

The Circulatory System
hardAges 10—11
Gas Exchange & Breathing
hardAges 12—13

Show full prerequisite tree

The Circulatory System hard
KS3 heart structure and double circulation extends KS2 introduction to the circulatory system
- Skeletons & Muscles soft
  Understanding skeleton and muscles provides context for internal organ systems
  - Body Parts & Senses soft
    Knowing body parts and senses supports understanding skeleton protects organs
    - Animal Body Groups soft
      Comparing animal structures supports understanding own body parts
      - Naming Common Animals hard
        Must know animal groups before comparing body structures
  - Animal Body Groups hard
    Must compare animal body structures before learning about skeleton/muscle system specifically
    - Naming Common Animals hard
      Must know animal groups before comparing body structures
  - Bones & Muscles soft
    Enrichment knowledge of skeleton and muscles supports formal curriculum study of skeletons for support, protection, movement
- Heart & Blood Circulation soft
  Enrichment knowledge of 4-chamber heart and double loop supports formal curriculum study of circulatory system
  - Cells, Tissues & Organs hard
    Understanding 4-chamber heart requires knowing organs work within organ systems
    - The Heart & Blood soft
      Cells-to-systems hierarchy helps organise knowledge of heart as an organ in a system
    - The Brain Controls the Body soft
      Cells-to-systems hierarchy helps organise knowledge of brain as an organ in a system
    - How Breathing Works soft
      Cells-to-systems hierarchy helps organise knowledge of lungs as organs in a system
  - The Heart & Blood hard
    Detailed circulatory system builds on knowing the heart pumps blood through blood vessels
- Organ Systems Vocabulary hard
  Identifying and naming parts of the circulatory system requires circulatory system vocabulary: artery, vein, capillary, blood vessel
- The Digestive System hard
  Must know digestive system before learning circulatory system that transports digested nutrients
  - Animal Nutrition hard
    Must understand nutrition before learning how the digestive system processes food
    - Herbivores, Carnivores & Omnivores soft
      Carnivore/herbivore/omnivore classification supports understanding nutrition differences
      - Naming Common Animals hard
        Must identify animal groups before classifying by diet
    - What Living Things Need hard
      Must know basic survival needs before learning about nutrition types and food groups
      - Common Plants & Trees soft
        Knowing plants helps understand what they need
      - Living Things Vocabulary soft
        Describing what plants and animals need to survive uses life processes vocabulary: nutrition, growth, sensitivity
      - Naming Common Animals soft
        Knowing animals helps understand what they need
  - The Digestive Journey soft
    Enrichment knowledge tracing the digestive journey supports formal curriculum study of digestive system parts
    - Basic Body Needs hard
      Tracing the digestive journey builds on knowing the body needs food for energy
      - The Heart & Blood soft
        Basic needs (exercise keeps heart strong) connects to knowing the heart pumps blood
      - How Breathing Works soft
        Basic needs (body needs air) connects to knowing about breathing and lungs
Gas Exchange & Breathing hard
The heart's role in the double circulatory system is only meaningful when gas exchange at the lungs is understood
- Cells to Organ Systems soft
  The gas exchange system is an organ system — hierarchy concept provides structural context
  - Plant Cells vs Animal Cells hard
    The cell-to-organism hierarchy builds on understanding that different cell types exist
    - Parts of Plant and Animal Cells hard
      Comparing plant and animal cells requires knowing the components found in each
      - Cells Under the Microscope hard
        Understanding cell components requires first knowing that cells are the fundamental unit of life
- How Diffusion Works hard
  Gas exchange at the alveoli is driven by diffusion — the mechanism must be understood first
  - Parts of Plant and Animal Cells hard
    Diffusion in and between cells requires knowing about the cell membrane as a selectively permeable boundary
    - Cells Under the Microscope hard
      Understanding cell components requires first knowing that cells are the fundamental unit of life

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