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This muscle never stops working… It works when you are asleep… It works when you eat… It really works wh PowerPoint Presentation
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This muscle never stops working… It works when you are asleep… It works when you eat… It really works when you exercise…. What is it????. The HEART. Located between the lungs in the mid thoracic region. Surrounded by a membrane called the pericardium.

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Presentation Transcript
slide1

This muscle never stops working…

It works when you are asleep…

It works when you eat…

It really works when you exercise….

What is it????

the heart

The HEART

Located between the lungs in the mid thoracic region

Surrounded by a membrane called the pericardium

Apex points toward the left hip

Composed of cardiac muscle tissue

slide3

The chambers:

Left & Right Atria

Left & Right Ventricles

The vessels:

Pulmonary artery & vein

Superior & inferior vena cava

Aorta

The valves:

Atrioventricular valves = Tricuspid, Mitral,

Semilunar valves = Pulmonary & Aortic

slide5

The Valves

Allow blood to flow in only one direction

The pulmonary semilunar valve is the doorway between the right ventricle and the pulmonary artery which carries “dirty” blood to the lungs

The aortic semilunar valve is the doorway between the left ventricle and the aorta which carries “clean” blood to the body

slide6

The Valves

Allow blood to flow in only one direction

The tricuspid valve separates the right atrium and right ventricle

Composed of 3 flaps

The mitral valve (sometimes called the bicuspid valve) separates the left atrium and left ventricle

Composed of 2 flaps

Valves open as blood is pumped through

Held in place by chordae tendineae (“heart strings”)

slide7

Aorta leaves left ventricle

  • Superior vena cava
    • enters right atrium

Pulmonary artery leaves right ventricle

Rt Pulmonary veins

enters left atrium

L Pulmonary veins

enters left atrium

  • Inferior vena cava
    • enters right atrium
slide8

The Vessels

Superior Vena Cava

Inferior Vena Cava

Carry deoxygenated blood from the upper and lower parts of the body into the heart

Pulmonary Veins

Carry oxygenated blood from the lungs to the heart

Pulmonary Arteries

Carry deoxygenated blood from the heart to the lungs

Aorta

Carries oxygenated blood from the heart out to the body

slide9

Cardiovascular System

A DOUBLE PUMP system

Pulmonary Circuit

RARVPulmonary arterycapillary beds of the alveoli

Systemic Circuit

capillary beds of the alveoliLALVAortaBody

  • Functions to deliver oxygen and nutrients and to remove carbondioxide and other waste products
slide10

Blood flow thru the

Human HEART

Oxygen-poor blood (shown in blue) flows from the body into the right atrium. Blood flows through the right atrium into the right ventricle. The right ventricle pumps the blood to the lungs, where the blood releases waste gases and picks up oxygen. The newly oxygen-rich blood (shown in red) returns to the heart and enters the left atrium. Blood flows through the left atrium into the left ventricle. The left ventricle pumps the oxygen-rich blood to all parts of the body.

slide11

Dub

Lub

If you listen to your heartbeat, it makes a lub dub sound.

The lub is when blood is pushed out of the heart into the body and the dub is the reloading of the heart with more blood ready to push it out to the body

slide12

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 Facts

Give a tennis ball a good, hard squeeze. You're using about the same amount of force your heart uses to pump blood out to the body. Even at rest, the muscles of the heart work hard--twice as hard as the leg muscles of a person sprinting.

The human heart can create enough pressure that it could squirt blood at a distance of thirty feet.

Scientists have discovered that the longer the ring finger is in boys the less chance they have of having a heart attack.

slide13

COMPOSITION BOOK

  • Cut out diagram of heart
  • Label the major vessels
  • Label the chambers
  • Label the valves
  • Color the areas of deoxygenated
  • blood blue
  • Color the areas of oxygenated blood
  • red
  • Answer the following
  • questions in complete sentences on
  • the page below your diagram

Why is the cardiovascular system referred to as a “double pump” system?

Where does the systemic circuit go?

What is the name of the circuit that is responsible for oxygenating the blood?