THE CIRCULATORY SYSTEM Circulatory System Functions Transportation of

THE CIRCULATORY SYSTEM

Circulatory System Functions • Transportation of materials: – Oxygen and Carbon Dioxide – Nutrients – Hormones – Wastes – Antibodies

Circulatory System Functions • Fights infections and defends against foreign bodies

Circulatory System Functions • Maintains homeostasis by – Controlling proper concentration of fluids in the body – Helping to maintain the body temperature

Circulatory System Functions • Controls blood loss in the event of an injury

LEVELS OF ORGANIZATION Organ System- Circulatory ORGANS • Heart • Blood Vessels ORGAN FUNCTION a muscle that pumps blood throughout the body veins, arteries, capillaries that deliver blood to all parts of body

LEVELS OF ORGANIZATION • TISSUES – Blood (liquid tissue) – Smooth Muscle Tissue- in blood vessels – Cardiac Muscle Tissue- in heart • CELLS – Smooth Muscle Cells – Cardiac Muscle Cells – Red Blood Cells (RBC) – White Blood Cells (WBC) • OTHER SPECIAL COMPONENTS -Plasma -Platelets

3 TYPES OF CIRCULATION • PULMONARY • Between the heart and lungs • SYSTEMIC • Between the heart and the rest of the body • CORONARY • Blood flow to and from the heart

3 MAIN COMPONENTS OF THE CIRCULATORY SYSTEM • BLOOD VESSELS • HEART

BLOOD • A mixture – can be separated by density • A liquid tissue • Function = Transports materials Plasma 55% of whole blood White Blood Cells (WBC) & Platelets <1% Red Blood Cells 45% of whole blood

COMPONENTS OF BLOOD (pale yellow)55% -is made of 98% water -carries nutrients, hormones and other materials to cells PLASMA White Blood Cells <1%(large clear) -fight infection Red Blood Cells 45%(small disc shaped) -transport O 2 and CO -contain hemoglobin Platelets <1% (cell fragments) -form clots to stop bleeding

CIRCULATORY SYSTEM INTERACTIONS • Blood interacts with many other systems • Brings nutrients to cells • Brings oxygen and removes CO 2 *removes nitrogen wastes • Carries hormones that help regulate the body • Carries WBCs and antibodies that fight infection

FAQ: How does a scab form?

3 MAIN COMPONENTS OF THE CIRCULATORY SYSTEM • BLOOD VESSELS • HEART

Arteries © carry blood AWAY from the heart © have thick, strong elastic walls

Arteries carry oxygen-rich blood throughout the body.

Veins © carry oxygen- poor blood TO the heart © have thin, elastic walls with valves © valves help veins return blood to the heart

Veins carry oxygen-poor blood back to the heart.

VALVES KEEP BLOOD MOVING IN ONE DIRECTION

Capillaries © connect arteries and veins © walls of capillaries are one cell layer thick © surround every cell in the body © site of gas exchange

BLOOD VESSELS

Blood vessels, heart, lungs all work together to bring oxygen to and remove carbon dioxide from the cells.

Blood Vessels ______ carry oxygencarry blood rich blood away from organs and from heart to tissues to heart body ______ microscopic blood vessels located between arteries and veins