HEART RATE LAB• Heart Beat• Measuring heart rate underdifferent conditions.• Do Investigating claims onyour own.

CIRCULATORY SYSTEM

THE CIRCULATORY SYSTEM

• 5.6 liters of blood being pumped at a time

= 2 liters

= 1 liter

• Takes 60 seconds for a blood cell to make a complete circuit of the body

• Your heart will beat 100,000 times today

• 35 million beats a year

• Aorta- diameter of garden house, capillaries as thin as a hair

FUNCTIONS OF CIRCULATORY SYSTEM

• Transportation• Oxygen• Nutrients

• Removal• Wastes from tissues

• The “Blood Mobile”

WHAT’S IN YOUR BLOOD?• Plasma

• Liquid part of the blood • 90% water

• White Blood Cells• Fight infection • Engulf bacteria cells

• Red Blood Cells• Most common blood cells

• Hemoglobin transported• Carries oxygen

• Platelets• Cell fragments• Helps clot blood

BLOOD VESSELS• Artery “away”

• Blood pushed away from heart• Blood vessel where a pulse can be felt• Delivers oxygen-rich blood to capillaries• High pressure

• Capillaries• Smallest blood vessel• Exchange materials, from blood to tissues and tissues to blood

O2, CO2, waster, nutrients

• Veins• Contains valves

• Brings wastes to the heart and lungs• Low pressure

• Varicose Veins valves no longer work

THE HUMAN HEARTAll Muscle

YOU’VE GOTTA HAVE HEART• Heart failure is the leading cause of death in

men and women• ~ 800,000 Americans a year of a heart attack• ~ 500,000 Americans who have already had a

heart attack have another one every year• Heart disease costs in America ~ $108.9 billion

YOU’VE GOTTA HAVE HEART

• Risk Factors• Inactivity-53%• Obesity- 34%• High Blood Pressure- 32%• Cigarette Smoking- 21%

• High Cholesterol- 15%

• Diabetes- 11%

EXTERNAL VIEW

pulmonary artery

pulmonary vein

coronaryartery

left ventricle

right ventricle

inferior vena cava

right atrium

pulmonary vein

aorta

superiorvena cava

INTERNAL VIEW

Superior Vena Cava

Inferior Vena Cava

INTERNAL VEIW

Right Atrium

INTERNAL VIEW

Right Ventricle

INTERNAL VIEW

Pulmonary Arteries

INTERNAL VIEW

Left Pulmonary Veins

INTERNAL VIEW

Left Atrium

INTERNAL VIEW

Left ventricle

INTERNAL VIEW

Aortic arch

Aorta

INTERNAL VIEW

Bicuspid Valve

Tricuspid Valve

Semilunar Valves

Septum

NODES• Natural pacemakers• Sinoatrial Node (SV node or SA node)

• Cardiac muscle mass on top of right atrium• Primary generator regular electrical impulses of the heart• Controls pulse, sends it to AV node

• Atrioventricular Node (AV node)• Secondary response, controls contraction• Delays signal, prevents simultaneous contraction

• Artificial Pacemakers• Atrial Fibrillation• Electrical signals and impulses occurring in places other than the nodes• Prevents the right atrium from filling up with blood, body is deprived of

blood.

TYPES OF CIRCULATION• Two types

• Systemic (greater) Circulation• Pulmonary (lesser) Circulation

• Systemic • Part of circulation that carries oxygenated blood away

from heart to the rest of the body. • Which side of the heart pushes the blood out? • Which vessel carries oxygenated blood away?

TYPES OF CIRCULATION• Pulmonary circulation

• Blood flow between heart and lungs. • Primary job is to exchange O2 and CO2

• In this way, it keeps systemic circulation on track