Circulatory System

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Slide 1

The Human Circulatory System

Slide 2

Heart

Slide 3

Major Veins and Arteries

Slide 4

Blood Vessels

HEART

Arteries

Arterioles

Capillaries

Venules

Veins

Slide 5

Blood Vessels

Arteries

Elastic, muscular walls

Keep blood under pressure

Nerve signals can make arteries constrict or dilate

Veins

Thinner, less elastic, less muscle than arteries

Lower pressure than arteries

Valves and gravity aid flow back to the heart

Capillaries

One cell thick

Where transfer of gases and nutrients takes place

Slide 6

Blood

Plasma (55% of whole blood)

Water with dissolved substances

Proteins, sugars, amino acids, salts, hormones

Variations in concentration

Metabolic imbalances

Kidney problems

Cells (45% of whole blood)

Erythrocytes (red blood cells)

Hemoglobin carries oxygen

Leukocytes (white blood cells)

fight infection

Platelets

Responsible of clot formation (coagulation)