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The Circulatory System. Learning Goals. I know the structure and function of the circulatory system. I know the diseases and disorders of the circulatory system. I understand the blood flow and parts of the heart. . Circulatory System. A transport system that has four main functions:

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Presentation Transcript
learning goals
Learning Goals
  • I know the structure and function of the circulatory system.
  • I know the diseases and disorders of the circulatory system.
  • I understand the blood flow and parts of the heart.
circulatory system
Circulatory System

A transport system that has four main functions:

  • Transport oxygen and carbon dioxide to and from the cells of the body
  • Transport nutrients to cells and waste from the cells
  • Transport hormones throughout the body
  • Maintain body temperature
three main components
Three Main Components
  • The pump – the heart
  • Fluid – the blood

3. Blood vessels (arteries, veins and capillaries)

the heart
  • Size of your first
  • Pumps blood through vessels
  • 4 chambers (2 atria and 2 ventricles)
  • Thick muscular walls – The left side of the heart is more muscular than the right. Why?
  • Controlled by electric signals from the brain
  • Sinoatrial node (SA node) is the pacemaker of the heart.

The Components of Blood:

  • Plasma - 55% of the blood volume

- 92% of plasma is water, the rest contains minerals (sugar, protein, fat, salts)

2. Red Blood Cells - has hemoglobin (red)

- Carries oxygen to the cells

- No nucleus

3. White Blood Cells – Carried to infected tissues to fight bacteria and virus’

4. Platelets – cell fragments (no nucleus) that help clot the blood.

blood vessels

3 Types:

  • Arteries – Largest vessels

- Carry blood away from the heart

- Have thick muscular walls

* The largest artery is the aorta

2. Veins – Thinner muscular walls

- Carry blood back to the heart

- Valves to prevent backflow

blood vessels continued
Blood Vessels Continued

3. Capillaries – Smallest blood vessels

- Site of gas exchange between blood and cells (diffusion)

- Connect arteries and veins

  • Artery wall thickens as a result of the accumulation of fatty materials such as cholesterol
  • Caused by damage to the innermost layer of the artery:

- High levels of cholesterol and fat in the blood.

- High Blood Pressure

- Cigarette Smoke

  • Wall thickens  artery diameter gets smaller less blood flow  decreases oxygen circulation.
  • Blood clot can form. If it cuts off oxygen supply to the brain – stroke. If it cuts off oxygen supply to the heart – heart attack.
varicose veins
Varicose Veins
  • Swollen, twisted and sometimes painful veins filled with an abnormal collection of blood.
  • Causes – Valves do not function properly, allowing blood to stay in the vein. Blood pools and causes swelling.
    • Standing for a long time can lead to varicose veins. Why?
  • Treatment – Avoid standing for too long, raise your legs, wear elastic support pressure stockings.

- Surgery: Vein Stripping removes the varicose veins in the legs. Usually only if severe pain or skin sores.

- Sclerotherapy: Medicine is injected into the veins, which make them shrink. Less invasive, improves appearance.



  • The circulatory system is a transport system that is made up of the blood, the heart, and the blood vessels.
  • It’s function is to move oxygen and nutrients to the cells of the body and remove carbon dioxide and wastes.
  • Heart disease is the group of conditions that affect the functioning of the heart.
  • Angiograms and electrocardiograms are important technologies that help diagnose abnormalities in the circulatory system.
  • Page 87 #3, 4, 5, 7 and 8



(Part II)

learning goal
Learning Goal
  • I understand the blood flow and parts of the heart.
heart rate activity
Heart Rate Activity

Heart Rate – The number of beats per minute (bpm)

1. Take your resting heart rate (neck next to your windpipe or wrist). Count the beats for 15 seconds than times that by 4

- Should be between 60-100

2. Do jumping jacks for 2 minutes. Take your heart rate again.

Why did we see these results?

let s take a look at the blood flow through the heart
Let’s Take a Look at the Blood Flow through the Heart

YouTube clip: Blood Flow through The Heart