9.3

Blood vessels

Cambridge IGCSE Biology (0610)  · Unit 9: Transport in animals  · 12 flashcards

Blood vessels is topic 9.3 in the Cambridge IGCSE Biology (0610) syllabus , positioned in Unit 9 — Transport in animals , alongside Circulatory systems, Heart and Blood.  In one line: Arteries have thick, muscular walls and a narrow lumen to withstand high blood pressure. They do NOT have valves.

This topic is examined in Paper 1 (multiple-choice) and Papers 3/4 (theory), plus Paper 5 or Paper 6 (practical / alternative to practical).

The deck below contains 12 flashcards — 3 definitions, 5 key concepts and 4 identification cards — covering the precise wording mark schemes reward.  Use the 3 definition cards to lock down command-word answers (define, state), then move on to the concept and application cards to handle explain, describe and compare questions.

Key definition

Describe the structure of an artery

Arteries have thick, muscular walls and a narrow lumen to withstand high blood pressure. They do NOT have valves.

Example: The aorta carries oxygenated blood away from the heart at high pressure.

What the Cambridge 0610 syllabus says

Official 2026-2028 spec

These are the exact learning objectives Cambridge sets for this topic. Match the command word (Describe, Explain, State, etc.) in your answer to score full marks.

  1. Describe Describe the structure of arteries, veins and capillaries, limited to: relative thickness of wall, diameter of the lumen and the presence of valves in veins
  2. State State the functions of capillaries
  3. Identify Identify in diagrams and images the main blood vessels to and from the: (a) heart, limited to: vena cava, aorta, pulmonary artery and pulmonary vein (b) lungs, limited to: pulmonary artery and pulmonary vein (c) kidney, limited to: renal artery and renal vein
  4. Explain Explain how the structure of arteries and veins is related to the pressure of the blood that they transport Supplement
  5. Explain Explain how the structure of capillaries is related to their functions Supplement
  6. Identify Identify, in diagrams and images, the main blood vessels to and from the liver as: hepatic artery, hepatic veins and hepatic portal vein Supplement
Definition Flip

Describe the structure of an artery.

Answer Flip

Arteries have thick, muscular walls and a narrow lumen to withstand high blood pressure. They do NOT have valves.

Example: The aorta carries oxygenated blood away from the heart at high pressure.
Definition Flip

Describe the structure of a vein.

Answer Flip

Veins have thinner walls compared to arteries, a wider lumen, and contain valves to prevent backflow of blood.

Example: The vena cava returns deoxygenated blood to the heart at low pressure.
Definition Flip

Describe the structure of capillaries.

Answer Flip

Capillaries have very thin walls (one cell thick) and a very narrow lumen, allowing for efficient exchange of substances between blood and tissues.

Example: Oxygen diffuses from capillaries into muscle cells.
Key Concept Flip

What are the main functions of capillaries?

Answer Flip

Capillaries facilitate the exchange of oxygen, carbon dioxide, nutrients, and waste products between the blood and body cells through diffusion.

Example: Glucose is delivered to brain cells through capillaries.
Key Concept Flip

Name the main blood vessels connected to the heart.

Answer Flip

The main blood vessels connected to the heart are: Vena Cava (to heart), Aorta (from heart), Pulmonary Artery (from heart), and Pulmonary Vein (to heart).

Example: Deoxygenated blood enters the heart via the Vena Cava.
Key Concept Flip

Name the main blood vessels connected to the lungs.

Answer Flip

The main blood vessels connected to the lungs are the Pulmonary Artery (to lungs) and Pulmonary Vein (from lungs).

Example: The pulmonary artery carries deoxygenated blood to the lungs.
Key Concept Flip

Name the main blood vessels connected to the kidney.

Answer Flip

The main blood vessels connected to the kidney are the Renal Artery (to kidney) and Renal Vein (from kidney).

Example: The renal artery brings unfiltered blood to the kidney.
Key Concept Flip

How is the structure of arteries related to the blood pressure they transport?

Answer Flip

Arteries have thick, elastic walls to withstand high blood pressure generated by the heart's pumping action. These elastic walls stretch and recoil to maintain consistent blood flow.

Example: The aorta's elasticity cushions the surge of blood from each heartbeat.
Key Concept Flip

How is the structure of veins related to the blood pressure they transport?

Answer Flip

Veins have thinner walls and valves to assist blood flow back to the heart against gravity, as blood pressure is much lower. The valves prevent backflow.

Example: Leg veins rely on valves to prevent blood pooling.
Key Concept Flip

How is the structure of capillaries related to their function?

Answer Flip

Capillaries' single-celled walls and narrow lumen provide a short diffusion distance for efficient exchange of substances. This large surface area maximizes the rate of exchange.

Example: Carbon dioxide diffuses quickly from tissues into capillaries.
Key Concept Flip

Name the main blood vessels connected to/from the liver.

Answer Flip

The main blood vessels to and from the liver are: Hepatic Artery (to liver), Hepatic Veins (from liver), and Hepatic Portal Vein (to liver).

Example: The hepatic portal vein transports nutrient-rich blood from the intestines to the liver.
Key Concept Flip

What is the role of the hepatic portal vein?

Answer Flip

The hepatic portal vein carries blood rich in nutrients absorbed from the small intestine directly to the liver. This allows the liver to process these substances before they enter the general circulation.

Example: Glucose absorbed during digestion is transported to the liver.

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9.2 Heart 9.4 Blood

Key Questions: Blood vessels

Describe the structure of an artery.

Arteries have thick, muscular walls and a narrow lumen to withstand high blood pressure. They do NOT have valves.

Example: The aorta carries oxygenated blood away from the heart at high pressure.
Describe the structure of a vein.

Veins have thinner walls compared to arteries, a wider lumen, and contain valves to prevent backflow of blood.

Example: The vena cava returns deoxygenated blood to the heart at low pressure.
Describe the structure of capillaries.

Capillaries have very thin walls (one cell thick) and a very narrow lumen, allowing for efficient exchange of substances between blood and tissues.

Example: Oxygen diffuses from capillaries into muscle cells.

More topics in Unit 9 — Transport in animals

Blood vessels sits alongside these Biology decks in the same syllabus unit. Each uses the same spaced-repetition system, so progress in one informs the next.

9.1 Circulatory systems

11 flashcards
9.2 Heart

12 flashcards
9.4 Blood

11 flashcards

Cambridge syllabus keywords to use in your answers

These are the official Cambridge 0610 terms tagged to this section. Mark schemes credit responses that use the exact term — weave them into your answers verbatim rather than paraphrasing.

artery vein capillary thick wall thin wall elastic muscle valve high pressure low pressure lumen exchange

Key terms covered in this Blood vessels deck

Every term below is defined in the flashcards above. Use the list as a quick recall test before your exam — if you can't define one of these in your own words, flip back to that card.

Describe the structure of an artery
Describe the structure of a vein
Describe the structure of capillaries

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How to study this Blood vessels deck

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