SNC2D SCIENCE

The Heart

Learning Goals

I can explain the structure and function of the

circulatory system.

Hierarchy of structure in Animals

Main Functions

1)Carries oxygen from lungs to cells

2)Carries carbon dioxide from cells to lungs

3)Carries nutrients from intestines to cells

4)Carries cellular wastes from cells to kidneys

The 3 main parts of The

Circulatory system

The Blood Vessels

The Heart

Blood

Types of Blood Vessels

Arteries

-Carry blood away from the Heart

- Carries oxygenated blood

Veins

-Carry blood to the Heart

- Carries deoxygenated blood

Capillaries

-connect arteries to veins

Blood Vessels

Parts of The Heart

The Atria (or Atriums)

-Receiving Chambers

The Ventricles

-Pumping Chambers

The Valves

-Prevents backflow

The Septum

-Divides the Heart

Heart The heart is a hollow, muscular organ that

pumps blood. It consists of two pumps that

lie side by side.

These pumps relax when taking in blood and

contract as they send out blood. The left side

of the heart is a stronger pump than the right.

Heart pumps: ~ 70 times per min [90 000

times per day]

Heart beat: “lub” “dub” sound due to

closing of valves

The Heart

Composed of cardiac muscle tissue, nerve tissue and connective tissue

Frequency of heart beat depends on your physical activity level

Exercise increases the volume of blood pumped by the heart

Did you know… – Your circulatory system

is about 60,000 miles long

– Your heart beats more than 2.5 billion times in the average lifetime

– the human heart creates enough pressure when it pumps out to the body to squirt blood 30 feet.

ANATOMY OF THE HEART

ANATOMY OF THE HEART

Label the structures and functions of the heart from your handout. Refer to your text page 100 You have 10 minutes!

Heart Animation 1

Heart Animation 2

Heart Disease

PATHWAY OF BLOOD

Think Pair Share: Make a list the

structures that a red blood cell would

pass through when moving in and out

of your heart.

PATHWAY OF BLOOD

1) a. superior vena cava or 1)b. inferior vena cava

2) right atrium

3) right AV valve (between atrium and ventricle)

4) right ventricle

5) right semilunar valve (pulmonary valve)

6) pulmonary artery (goes to lungs)

PATHWAY OF BLOOD

7) pulmonary vein

8) left atrium

9) left AV valve

10) left ventricle

11) left semilunar valve (aortic valve)

12) aorta

HEART SOUNDS

http://www.youtube.com/watch?v=H04d3rJCL

CE

When you hear your heart beating, what are you actually

listening to?

Components of the blood

The Composition of Blood

The Plasma (Fluid) makes up

55% of the blood volume.

The Solids (Cells) make up

45% of the blood volume.

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Blood Composition

Plasma Solids

Blood Plasma

97% Water

Other 3%

-Antibodies and Proteins

- Nutrients and Wastes

Blood Solids

Red Blood Cells

-Carry oxygen

-Contain Hemoglobin

White Blood Cells

-Attack bacteria & other invaders

Platelets

-Control the blood clotting process

Success Criteria

I can explain the components of the

circulatory system.