Topic: Circulatory SystemAim: Explain the function and structure of the

circulatory system.

Do Now: Multiple Choice question (take out your numbers)

HW: Respiratory System Reading notes due MondayDigestive and Circulatory Castle Learning due

Wednesday

The main function of the digestive system is to

1.rid the body of cellular waste materials

2.process organic molecules so they can enter cells

3.break down glucose in order to release energy

4.change amino acids into proteins and carbohydrates

What is the primary function of the large intestine?

1.To digest proteins

2.To absorb nutrients

3.To break down complex carbohydrates

4.To remove water from undigested waste

Identify the blood vessel being described (A, V or C).

1.Largest and most muscular blood vessels.

2.The smallest blood vessels.

3.Capillaries carry blood to these blood vessels.

4.Blood vessel used to feel your pulse.

5.Carry blood to other organs.

6.Where the exchange of substances between the blood and cells occurs.

7.Most of these carry deoxygenated blood back to the heart.

8.Contain valves to prevent the backflow of blood.

9.Carry blood under high pressure.

10.Red blood cells travel move in single file.

http://www.youtube.com/watch?v=NYB-rJZQt4w

Function •TRANSPORT substances throughout the body

•Where is oxygen transported?•Where are wastes transported?•What other substances are

transported by the circulatory system?

Heart Facts• Hold out your hand and make a fist. If

you're a kid, your heart is about the same size as your fist, and if you're an adult, it's about the same size as two fists.

• Your heart beats about 100,000 times in one day and about 35 million times in a year. During an average lifetime, the human heart will beat more than 2.5 billion times.

Heart •Cardiac muscle

L

R

Parts of the heart

ISN questions # 5

1.Atria:• Upper

chambers• Receive

blood• R and L

2. Ventricles:

•Lower chambers

•Pump blood out of heart

•R & L

Which chambers are more muscular? Atria or ventricles? Why?

•Thicker & muscular bc pump blood to rest of body

3. Septum = thick wall that separates right & left sides

4. Valves = flaps of tissue bw atria and ventricles

• Prevent backflow of blood

Lub If you listen to

your heartbeat, it makes a lub dub sound. What you hear is the sound

of the valves closing as they

pump 4,300 gallons of oxygen rich blood a day.

Dub

Right Atrium

Right Ventricle

Left atrium

Left Ventricle

Valves

Valves

Blood flow in the heart

ISN questions #’s 2, 4, 1, 3

•Right side: deoxygenated blood–To the LUNGS

•Left side: oxygenated blood–From LUNGS–To all body parts

LEFT (oxygenated)

RIGHT (deoxygenated)

Blood pumped on each side of the heart DOES NOT MIX!!

Blood vessels attached to the heart

• Vena Cava:

Carry DB from the body to the right side of the heart

• Pulmonary arteries: carry DB to the lungs

• Pulmonary veins: carry OB from the lungs back to the left side of the heart

AORTA

Is the aorta attached to the right or left side?So what kind of blood does it carry?Where does this blood go?

• Aorta: largest artery in the body– Carries OB from the left side of the heart to the

rest of the body.

• Right atrium (DB)

• Right ventricle (DB)

• Pulmonary arteries (DB)

• Lungs (OB)

• Pulmonary Veins (OB)

• Left atrium (OB)

• Left ventricle (OB)

• Aorta (OB)

• Rest of the body

• Vena Cava (DB)

• Right atrium (DB)

Let’s summarize…

1. Explain the function of the circulatory system.

2. Describe the four chambers of the heart.

3. Explain the importance of heart valves.

4. Why is the septum so important?

5. Where is deoxygenated blood pumped to?

6. Where is oxygenated blood pumped to?

1- Inferior vena cava

2- Pulmonary veins

6 - Pulmonary veins

3- Pulmonary arteries

5 - Pulmonary arteries

Suerior vena cava

7- right ventricle

8- left ventricle

10 - aorta

http://www.brainpop.com/health/bodysystems/circulatorysystem/

http://www.brainpop.com/health/bodysystems/heart/

Review: Identify the part of the heart being described.

1. Chamber that receives oxygenated blood.

2. Wall that separates the right and left side of the heart.

3. Chamber that pumps out deoxygenated blood.

4. Chamber that receives deoxygenated blood.

5. Prevents the backflow of blood between atria and ventricles.

6. Chamber that pulps out oxygenated blood.

Atherosclerosis

Autopsy specimen of aorta has been opened lengthwise to reveal luminal surface studded with lesions of atherosclerosis.

Coronary atherosclerosis

Hypertension

Coronary Thrombosis

• Heart attack

• Caused by BLOCKAGE of coronary artery

• O2 does not get to heart muscle

http://www.smm.org/heart/heart/in-out.htm

http://www.smm.org/heart/heart/pumping.htm