Members of the Cardiovascular System

• Heart• Blood Vessels• Blood

The Heart• Muscular (cardiac muscle)

organ in chest• 2 pumps (Right and left

side)– Work together to move

blood all around your body– Each side has a top (Atrium)

and a bottom (ventricle)• 4 chambers of heart

• Heart muscles contract push blood from the heart to the blood vessels

Click here to see it in action!

Key Parts• Right Atrium RA• Right Ventricle RV• Left Atrium LA• Left Ventricle LV• Aorta• Vena Cava• Pulmonary Artery PA• Pulmonary Vein PV

Blood Vessels

• Arteries– Carry blood AWAY from heart– Full FedEx Trucks travel on here

• Veins– Carry blood back TO the heart– Empty FedEx Truck travel on here

• Capillaries– Teeny, tiny blood vessels that connect

to arteries and veins– Nutrients and gas can pass through the

capillaries from the blood to the cells that need them

Circulation Is Like FedEx Delivery Service

• Oxygen molecules packages everyone is ordering from their homes (tissues all over the body)

• Lungs Warehouses with the packages (oxygen)• Tissues individual homes, placing orders for the oxygen • Heart the distribution center of the body with the trucks needed

to pick up packages from lungs and then deliver them to tissues– that directs trucks (RBCs)

• Red Blood Cells (RBCs)delivery trucks carrying packages • they are either full of packages to deliver or empty

• Arteries and Veins ONE-WAY roads trucks travel on• Clogged arteries, plaque build up Traffic Jams/lane

closures/road blocks

Flow of Blood• RBCs go from RA

to RV thru Pulmonary Arteries to LUNGS to pick up oxygen

Flow of Blood

• Oxygenated blood enters LA, then the LV and then gets sent through the AORTA to deliver oxygen to tissues

Flow of Blood• Oxygen and nutrients

travel from ARTERIES thru CAPILLARIES to cells

• Deoxygenated blood and Waste (CO2) leaves cellscapillariesveins to be carried back to heart – (to be sent back to lungs

to pickup more oxygen)

Flow of Blood

• Waste and deOXY blood enter RA, the RV and then get get pumped out of the PULMONARY ARTERY to the lungs to get OXYGEN– need to go to factory to

pick up more packages

Flow of Blood• Blood now has

oxygen and returns to the heart through the PULMONARY VEIN to the LA, then LV, then back through the AORTA to start delivering more oxygen

Factors That Affect Blood Flow

• Heart Rate– Beats per minute (bpm)– Avg. adult at rest: 60-100 bpm– Exercise, stress, chemicals increases bpm

• The force of the blood pushing against the walls of the arteries

• Your blood pressure is at its highest when the heart beats, pumping the blood. This is called systolic pressure.

• When the heart is at rest, between beats, your blood pressure falls. This is the diastolic pressure.

Blood Pressure

Cardiovascular Disease Causes

• Heart attack and stroke are two main causes of death resulting from the following conditions:

• Atherosclerosis – Condition in which fatty deposits called

PLAQUE build up on the inner walls of arteries

– Results in blood clots• High Blood Pressure

– Condition where heart and blood vessels are being overworked

– HYPERTENSION– Leads to other diseases

Atherosclerosis• Plaque is made up

of fat, cholesterol, calcium, and other substances found in the blood.

• Over time, plaque hardens and narrows your arteries

• This limits the flow of oxygen-rich blood to your organs and other parts of your body

• Leads to blood clots, heart attack, stroke and DEATH

Causes and Prevention of Atherosclerosis

• Certain traits, conditions, or habits may raise your risk for the disease…called RISK FACTORS

• Uncontrollable RISK FACTORS– Age– Family History of heart disease

• Controllable RISK FACTORS– Physical Activity– Smoking– Unhealthy diet

• MAIN TREATMENT for atherosclerosis:1) lifestyle changes2) medicines and medical procedures

Hypertension• TWO WAYS To create High Blood

Pressure (Hypertension)1. Extra fluid in the body

increases the amount of fluid in blood vessels and makes blood pressure higher• Infection/disease

2. Narrow, stiff, or clogged blood vessels also raise blood pressure• Due to plaque build up