Download HEART arteries veins arterioles venules capillaries

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Blood Vessels
A. Arteries
1. Elastic, muscular walls
a. Keep blood under pressure
2. Nerve signals can make arteries constrict or dilate
B. Veins
1. Thinner, less elastic, less muscle than arteries
2. Lower pressure than arteries
3. Valves and gravity aid flow back to the heart
C. Capillaries
1. One cell thick
2. Where transfer of gases and nutrients takes place
Composition of Blood
A. Plasma
1. Water with dissolved substances
a. Proteins
b. Sugars
c. Amino acids
d. Salts
e. Hormones
2. Variations in concentration
a. Metabolic imbalances
b. Kidney problems
B. Cells
1. Erythrocytes (red blood cells)
a. Hemoglobin carries oxygen
2. Leukocytes (white blood cells)
a. fight infection
3. Platelets
a. Responsible of clot formation (coagulation)
C. Lymphatic System
1. Drainage for intercellular fluids