THE CIRCULATORY SYSTEM

• transports oxygen and nutrients throughout the body

• carries away wastes

• made up of blood,the heart, and blood vessels.

what’s in

red blood cells

white blood cells

platelets

plasma

carbon dioxide

Nutrients from food

waste (urea)

hormones

oxygen

Blood

• It contains 4 parts:– Red blood cells– White blood cells– Platelets– Plasma

Red Blood Cell

White Blood Cell

Platelets

Red Blood Cells

• contain hemoglobin, which transports O2 to organs and CO2 away from organs

White Blood Cells

• fight infection

Platelets

• help blood clot

Plasma

• Liquid which carries blood components

Blood Vessels• A network of tubes that carry blood

• Contains 3 types of vessels1.Arteries 2. Veins 3. Capillaries

The ARTERY

thick muscle and elastic fibres

Arteries - carry O2 rich blood from the heart. Thick, muscular walls due to tremendous pressure.

the thick muscle can contract to push the blood

along.

Q: What’s the difference between a heart attack and a stroke?

• Both are caused by an artery being blocked and blood not getting to an organ.

• When blood cannot get to the heart muscle, the heart muscle starts to die – this is a heart attack.

• When Blood cannot get to the brain, that portion of the brain starts to die – this is a stroke.

A person is complaining that they can’t feel their fingertips and can’t move their leg. They are also feeling very confused.

Question: Is this person most likely having a heart attack or a stroke?

Answer:

This person is having a stroke.

The brain controls movements, feelings and thinking. Because blood, and therefore oxygen is not getting to their brain, that section of the brain is dying and can no longer do its job.

Read – Pair - Share

1. Pick a partner.2. On pages 85 or 86, you will read about

either Coronary Artery Disease or Heart Attacks, your partner will read the other.

3. Fill in one half of the Medical Facts Sheet with point form notes

4. Explain what you learned to your partner. Help you partner fill in the missing side of their notes.

Coronary Artery Disease and Heart Attacks

Many conditions affect the function of the circulatory system. The most common heart problem is coronary artery disease, which can lead to a heart attack.

The CAPILLARY

Capillaries - only one cell thick to enable gas and nutrient exchange.

artery vein

capillariesbody cell

The CAPILLARYA collection of capillaries is known as a capillary capillary bedbed.

plasma

red blood cell

white blood cell

platelets

The VEINVeins - have thin walls and carry

blood back to the heartthin muscle

valve

The Heart

• Pumps blood around body

• Nerve cells (pacemaker cells) send electrical signal to contract heart.

• Human heart has 4 chambers.

• Heart beat depends on oxygen needed by body

Animation

Contraction animation

Video of human heart

Blood Circulation1. Right side of heart pumps blood to lungs

2. Diffusion of gases in lungs (O2 in, CO2 out)

3. Blood goes to left side of heart and pumps into arteries

4. Arteries get smaller and smaller until they are capillaries

5. In Capillaries, O2 & nutrients diffuse into cells, CO2 out.

6. Blood flows into veins into right side of heart.

Video