Functions ofthe blood(1) Transport through the body ofoxygen (O2) and carbon dioxide (CO2)?* nutrientsmetaboliteshormones, etc(2) Defense of the body against infections and otherforeign materials.(3) Participates in regulation of the body temperature(4)Maintenanceofacid-basebalanceandosmoticbalance (cellular homeostasis)6
6 Functions of the blood (1) Transport through the body of v oxygen (O2) and carbon dioxide (CO2) v nutrients v metabolites v hormones, etc (2) Defense of the body against infections and other foreign materials. (3) Participates in regulation of the body temperature (4) Maintenance of acid-base balance and osmotic balance (cellular homeostasis)
I.Erythrocytes,redbloodcellsThe normal concentrationinthe blood-Males:4.0-5.5×1012/L-Females: 3.5-5.0×1012/L·RBCs↑-maybephysiologicadaptationse.g. People live at high altitudes where O2 tension is low.RBCsI-isusuallyassociatedwithanemiaSEM
7 Ⅰ. Erythrocytes , red blood cells v The normal concentration in the blood -Males: 4.0-5.5×1012/L -Females: 3.5-5.0×1012/L v RBCs↑ -may be physiologic adaptations e.g. People live at high altitudes where o2 tension is low. v RBCs↓ -is usually associated with anemia. SEM
I. Erythrocytes , red blood cellsStructureXA.Biconcavedisks inshape--7.5μm in diameter2.0μm--2.6μm thick at the rimSideview--0.8μm thick in the centerB.Without nuclei and organelles7.5μmTopviewBloodsmear
8 Ⅰ. Erythrocytes , red blood cells v Structure A. Biconcave disks in shape -7.5µm in diameter -2.6µm thick at the rim -0.8µm thick in the center B. Without nuclei and organelles Blood smear
MGEScanningelectronmicrographof normal blood cellsNotetheirbiconcaveof erythrocytes.(E)
9 图2 血细胞扫描电镜图(E红细胞 G粒细胞 L淋巴细胞 M单核细胞 P血小板) v Scanning electron micrograph of normal blood cells. v Note their biconcave of erythrocytes.(E)
Erythrocyteswithdiametersgreaterthan9μmarecalledmacrocytesthose with diameters less than 6um are calledmicrocytes.The presence of a high percentage of erythrocyteswith great variation in size is called anisocytosis10
10 v Erythrocytes with diameters greater than 9µm are called macrocytes v those with diameters less than 6µm are called microcytes. v The presence of a high percentage of erythrocytes with great variation in size is called anisocytosis