The Human Heart

THE HUMAN HEARTLubb-Dubb

THE HEART

Made of muscle tissue Heart wall is made of cardiac muscle Contains pacemaker Contains nervous tissue responding to stimuli

(leading to increase or decrease in heart rate) Protection of heart

Ribs, sternum, spine Contains 4 chambers, separated by septum

Right and left atria Receiving chambers

Right and left ventricles Delivery chambers

DOUBLE CIRCULATION SYSTEM

THE HUMAN HEART

PATH OF BLOOD THROUGH THE HUMAN HEART

There are three main systems or “cycles” that involve getting blood through the heart to the other parts of the body and back:

1. Pulmonary System Supplies the lungs (poumon = lungs in French) Low-pressure system

2. Systemic System Supplies the body High-pressure system

3. Cardiac System Supplies the heart

PULMONARY SYSTEM

1. PULMONARY SYSTEM (supplies lungs) R atrium R ventricle pulmonary arteries* (*only arteries that carry

deoxygenated blood) arteries, arterioles capillaries venules, veins pulmonary veins* (*only veins that carry O2-rich

blood) L atrium

deoxygenated bloodoxygenated blood

SYSTEMIC SYSTEM

2. SYSTEMIC SYSTEM (suppies body cells, except heart) L atrium L ventricle aorta arteries, arterioles capillaries venules, veins superior & inferior vena cava R atrium

NOTE: BLOOD IS NOW BACK TO WHERE IT “STARTED”.

deoxygenated bloodoxygenated blood

CARDIAC SYSTEM

3. CARDIAC SYSTEM (supplies heart) L ventricle aorta coronary arteries coronary/cardiac veins R atrium

deoxygenated bloodoxygenated blood

CARDIAC SYSTEM – CORONARY ARTERIES

PRACTICE!! Miss S. will explain everything.

THE SOUNDS OF THE HEART Anyone remember what Bill Nye said the

sounds the heart makes are??1. “LUBB”

Louder, longer sound Made by the closing of AV valves and

opening of semi-lunar valves Occurs at the beginning of systole

Ventricles contract, forcing blood out

2. “DUBB” Quieter, shorter sound Made by closing of semi-lunar valves and

opening of AV valves Occurs at the beginning of diastole

Ventricles relax, allowing blood in

INVESTIGATION

You will be put into partners to complete the investigation activity on heart sounds.

Answer all questions on the paper provided.

When we are finished (in about 10 minutes), we will take up the answers together.

Miss S. will collect the papers and record the marks.

HAND BACK DAY Quizzes

Soil Erosion Assignments

Marks Showing

Test Anatomy June 14th or June 15th (Monday or Tuesday) Review will be the day before When it is will depend on how long the dissection

takes