Circulatory system

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  • Created by: Kristy
  • Created on: 15-02-11 17:26

What are the three main components of the circulat

- The heart

- Blood Vessles

- Blood

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What does the Pulmonary Circuit do?

The pulmonary circuit carries blood to the lungs to be oxygenated. In the lungs carbon dioxide is removed and oxygen is gained.

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What happens in the systemic circuit?

Carries oxygenated blood around the body and returns de-oxygenated blood back to the heart.

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What does blood carry?

Blood carries nutrients and waste.

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What happens when the heart beats?

The blood is pumped to the heart and around the body.

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What is cardiac output?

The amount of blood pumped in one minute.

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How do you work out Cardiac output?

Heart rate x Stroke Volume = Cardiac output.

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What is stroke volume?

The volume of blood pumped from the heart within each beat.

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What are Arteries and what is there job?

- Carries oxygenated blood away from the heart (apart from the pulmonary artery which goes to the lungs)

- Have thick muscular walls

- Have small passageways for blood

- Contains blood under high pressure.

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What are veins and what is their job?

- Carries de-oxygenated blood to the heart (apart from the pulmonary vein which goes from the lungs to the heart.

- Have thin walls

- Has larger passageways for blood

- Contains blood under low pressure

- Have valves to prevent blood flowing backwards.

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What are Capillaries and what is their job?

- Found in muscles and lungs

- Microscopic - one cell thick

- Very low blood pressure

- Where gas exchange takes place

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What is gas exchange?

Gas exchange passes through the capillaries wall and into the tissue, carbon dioxide passes from the tissues to the blood.

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What are the four things blood does whilst exceris

- Transports nutrients and waste

- Delivers oxygen to the working muscles

- Remove heat

- Carries away lactic acid

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Blood pressure increases when you...


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