רקמת הדם הדם... זורם לכל מקום בגוף האדם. לא נוכל לחיות בלעדיו. הלב מזרים דם לכל תאי הגוף. הדם מספק לתאים חמצן, חומרי מזון וחומרים חיוניים אחרים, ומסלק.

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Presentation transcript:

רקמת הדם

הדם... זורם לכל מקום בגוף האדם. לא נוכל לחיות בלעדיו. הלב מזרים דם לכל תאי הגוף. הדם מספק לתאים חמצן, חומרי מזון וחומרים חיוניים אחרים, ומסלק מהם חומרי פסולת.

Figure Withdraw blood Place in tube פלסמה55% CONSTITUENTMAJOR FUNCTIONS Water Solvent for carrying other substances Salts Osmotic balance, pH buffering, and regulation of membrane permeability Sodium Potassium Calcium Magnesium Chloride Bicarbonate Plasma proteins Osmotic balance, pH buffering Clotting Immunity Albumin Fibrinogen Immunoglobins (antibodies) Substances transported by blood Nutrients (e.g., glucose, fatty acids, vitamins) Waste products of metabolism Respiratory gases (O 2 and CO 2 ) Hormones Centrifuge תאים 45% CELL TYPENUMBER (per mm 3 of blood) FUNCTIONS Erythrocytes (red blood cells) 5–6 millionTransport of oxygen (and carbon dioxide) Leukocytes (white blood cells) 5,000–10,000 Defense and immunity Basophil Eosinophil Neutrophil Lymphocyte Monocyte Platelets 250,000– 400,000 Blood clotting מרכיבי הדם:

תאי דם אדומים תעודת זהות

תפקיד עיקרי: נשיאת חמצן לכל תאי הגוף.

צורה: דיסקוס דו -שקערורי

מימדים:

כמויות: אשהאשה : 4-5 מיליון תאים בסמ"ק דם. מהווים 35% - 47% מנפח הדם. גברגבר: 5-6 מיליון תאים בסמ"ק דם. מהווים 40% - 52% מנפח הדם.

תכונות נוספות: מכילים המוגלובין המקנה להם את צבעם האדום. חסרי גרעין גמישים