Bell Ringer (Day 1) Write these in your notebook and save them to be turned in with your test. Students will be able to explain the purposes of arteries,

Bell Ringer (Day 1)

Write these in your notebook and save them to be turned in with your test.Students will be able to explain the purposes of arteries, veins, and capillaries.Students will be able to describe the path of deoxygenated blood to oxygenated blood. Students will be able to identify the different parts of a human heart.Students will be able to describe problems that affect the cardiovascular systemStudents will be able to list risk factors related to heart disease that are within a person’s controlStudents will be able to list many different cardiovascular diseases

Cardiovascular System

Definition

The cardiovascular system is made up of your heart, blood, and a network of branching blood vessels.

How Body Cells Work Video Clip

Heart

Your heart is really a muscle. It's located a little to the left of the middle of your chest, and it's about the size of your fist. This amazing muscle pumps 4300 gallons of blood a day.The heart sends blood around your body. This blood provides your body with the oxygen and nutrients it needs. It also carries away the waste that your body has to get rid of.

Heart cont’d

Your heart is sort of like a pump, or two pumps in one. The right side of your heart receives blood from the body and pumps it to the lungs. The left side of the heart does the exact opposite: it receives blood from the lungs and pumps it out to the body. By the time you're grown up, your heart

will be beating (pumping) about 70 timesa minute.

The Heart

Heart Parts

The heart is made up of four different areas, called a chambers.

There are two chambers on each side of the heart: one chamber is on the top, and one chamber is on the bottom.

The two chambers on top are called the atria, but if you are only talking about one, then say atrium. The atria are the chambers that fill with blood.

Heart Parts

The two chambers on the

bottom are called the ventricles.

Their job is to squirt out the blood.

Running down the middle of the heart is a thick wall of muscle called the septum. The septum's job is to separate the left side and the right side of the heart.

Heart Chambers

Heart Valves

When the blood gets pumped in, it relies on four

special valves inside the heart to get directed out

Two of the heart valves are the mitral valve and the tricuspid valve, and they work between the atria and ventricles.

The other two are called the aortic valve and pulmonary valve, and they're in charge of controlling the flow as the blood leaves the heart.

Heart Valves

Activity

1- Find your pulse2- Count the beats for one minute3- Calculate how many times your heart

beats in a day, week, month & year.4- How many times has your heart

beaten since you were born?

(Do the math on paper if no calculator!!)

Hmmmmm……

Can blood be blue?Is there really blue blood?What do you think?

A vein looks blue because red light travels far enough into the skin to be absorbed by the blood in the vein. If the blood vessel is far enough below the skin, however, blue light--which would normally also be absorbed by the vein--reflects out of the skin before reaching the vein. So the light reflecting from tissue over the vein contains less red light than blue, giving the vein a bluish cast. For a vein to look blue, it has to be at least .02 inch below the surface, which explains why fair-skinned people look pink and not blue when they blush. The small surface capillaries that become engorged during blushing lie just a thousandth of an inch below the skin's surface. Past about .08 inch, light can't penetrate, and blood courses unseen.

Why Does Blood Appear Blue?

The End!!