The Circulatory The Circulatory SystemSystem

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The Circulatory SystemThe Circulatory System

The circulatory The circulatory system system circulates circulates (moves) your (moves) your blood through blood through your body.your body.

BloodBlood

Blood carries oxygen and digested Blood carries oxygen and digested nutrients to the cells and carbon nutrients to the cells and carbon dioxide and excess water from the dioxide and excess water from the cells.cells.

BloodBlood

Blood has a liquid part, called Blood has a liquid part, called plasmaplasma, and a solid part, made up of , and a solid part, made up of blood cells.blood cells.

Red Blood CellsRed Blood Cells

Red blood cells contain a substance Red blood cells contain a substance called called hemoglobinhemoglobin, which picks up , which picks up the oxygen.the oxygen.

They look like pinched disks.They look like pinched disks.

White Blood CellsWhite Blood Cells

White blood cells fight disease and White blood cells fight disease and infection by destroying foreign infection by destroying foreign materials.materials.

PlateletsPlatelets

Platelets are tiny, colorless pieces of Platelets are tiny, colorless pieces of cells that help stop bleeding by cells that help stop bleeding by giving off a chemical that helps giving off a chemical that helps blood clot.blood clot.

Blood VesselsBlood Vessels

Blood vessels travelling away from the Blood vessels travelling away from the heart are called heart are called arteriesarteries..

The blood in arteries is usually rich in The blood in arteries is usually rich in oxygen and nutrients.oxygen and nutrients.

Blood VesselsBlood Vessels

Blood vessels travelling back to the Blood vessels travelling back to the heart are called heart are called veinsveins..

The blood in veins is usually carrying The blood in veins is usually carrying carbon dioxide and waste materials.carbon dioxide and waste materials.

Blood VesselsBlood Vessels

Arteries and veins are connected by Arteries and veins are connected by very tiny very tiny capillariescapillaries that pass by that pass by the cells of the body.the cells of the body.

The HeartThe Heart

Blood flows through the Blood flows through the heart, through each heart, through each of the four chambers.of the four chambers.

The right atrium The right atrium receives the blood receives the blood carrying carbon carrying carbon dioxide from all parts dioxide from all parts of the body and of the body and passes it through a passes it through a valve into the right valve into the right ventricle.ventricle.

The HeartThe Heart

The right ventricle The right ventricle contracts and contracts and pumps the blood pumps the blood through the through the pulmonary artery to pulmonary artery to the lungs, where the lungs, where the blood gives up the blood gives up its carbon dioxide its carbon dioxide and picks up and picks up oxygen.oxygen.

The HeartThe Heart

The blood then The blood then returns along the returns along the pulmonary vein to pulmonary vein to the left atrium the left atrium and passes and passes through a valve through a valve into the left into the left ventricle.ventricle.

The HeartThe Heart

The left ventricle The left ventricle then contracts then contracts and the now-and the now-oxygen-rich blood oxygen-rich blood is pumped to the is pumped to the rest of the body.rest of the body.

Your PulseYour Pulse

Note that both ventricles contract at Note that both ventricles contract at the same time, squeezing the blood the same time, squeezing the blood out of the heart in spurts. These out of the heart in spurts. These spurts are what is felt as a pulse.spurts are what is felt as a pulse.

The Lymphatic The Lymphatic SystemSystem

Note that blood is not Note that blood is not the only material the only material circulated through circulated through your body. The your body. The lymphatic system lymphatic system circulates a clear, circulates a clear, yellowy liquid called yellowy liquid called _______ through the _______ through the body.body.

The Lymphatic The Lymphatic SystemSystem

Note that blood is not Note that blood is not the only material the only material circulated through circulated through your body. The your body. The lymphatic system lymphatic system circulates a clear, circulates a clear, yellowy liquid called yellowy liquid called lymphlymph through the through the body.body.

LymphLymph

Lymph helps transport Lymph helps transport fats but more fats but more importantly, transports importantly, transports bacteria to the lymph bacteria to the lymph nodes and spleen so nodes and spleen so that they can be that they can be destroyed.destroyed.

You may have noticed how lymph nodes in your neck become swollen when you have an infection.