Bios 255 exam 1 - –Answer to transport blood throughout the bod...

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Bios 255 exam 1

• General Function of cardiovascular system

–Answer to transport blood throughout the body to allow the exchange of substances (e.g., respiratory gases, nutrients, and waste products) between the blood of capillaries and the body's cells. The "goal" of it is to provide adequate perfusion of all body tissues.

• Composition of blood

–Answer 55% plasma, 45% formed elements (red blood cells, white blood cells and platelets)

• centrifuged blood

–Answer 55% plasma, 45% formed elements, 1% buffy coat,

• Plasma

–Answer Liquid part of blood, plasma 55%( water, dissolved gasses, nutrients, waste products, proteins)

• buffy coat contains

–Answer leukocytes and platelets (less than 1% of blood)

• Hematocrit (Hct)

–Answer -percentage of erythrocytes in a volume of blood Female –Answer

36-46%

Male –Answer

42-52%

Increased = dehydrated Decrease = over hydrated, anemia, blood loss ***Should be 3 times the Hgb 1 / 2

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• Three formed elements of blood

–Answer leukocytes, platelets

• Erythrocytes (RBC)

–Answer 4.2 - 6.2 million/ ul. biconcave disc

• Leukocytes

–Answer 5000 - 10000/ ul

• Platelets (thrombocytes)

–Answer 130,000-360,000/ul

• Role of erythrocytes

–Answer carry oxygen and carbon dioxide

• Erythrocytes homeostasis

–Answer Here's how erythrocytes maintain homeostasis –Answer Interstitial fibroblasts within the kidney secrete EPO, which increases erythrocyte production and restores oxygen levels.As oxygen saturation rises, EPO secretion falls, and vice versa.The body achieves a balance (homeostasis) where you have the right amount of red blood cells.

• Erythrocytes Disorders

–Answer anemia-too little rbc's and polycythemia- too many rbc's and sickle cell disease

• erythrocytes clinical significance

–Answer A higher red blood cell count is generally considered to be anything above 6.1 million red blood cells for males, 5.4 million for females.

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