BIOL 204: Blood (chapter 17)

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111 Terms

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what is blood?
fluid that acts as a transport system for the body
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functions of blood
transport, regulation, protection
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transport of blood function
Delivering o2 and nutrients to body cells, transporting metabolic. transporting hormones from endocrine organs to target organs
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what organs are part of transport of blood?
wastes to lungs and kidneys for elimination
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which organs do hormones get transported to?
endocrine organs to target organs
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regulation of blood function
maintaining body temperature by absorbing and distributing heat, maintaining normal pH using buffers; alkaline reserve of bicarbonate ions, maintaining adequate fluid volume in circulatory system
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what instrument is used to normalize pH?
buffers
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protection of blood
preventing blood loss, preventing infection
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preventing blood loss
plasma proteins and platelets in blood initiate clot formation
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preventing infection
agents of immunity are carried in blood (antibodies, complement proteins, white blood cells= leukocytes)
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what agents are carried in blood
antibodies, complement proteins, and WBC’s
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blood is the only tissue ______
that is fluid
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blood is a mix of
matrix and cellular components
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matrix is also?
plasma
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cellular components is also?
formed elements
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the color of blood varies with
\n o2 content
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T/F: de-oxygenated blood is blue
false
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what is the pH range of blood
\n 7.35-7.45
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volume of blood in males
5-6L
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volume of blood in females
4-5L
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Red blood cells (RBC)
erythrocytes- 45% of whole blood
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what is hematocrit?
percent of blood volume that is erythrocytes
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what is buffy coat?
White blood cells and platelets (1%)
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white blood cells (WBC)
leukocytes
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how much blood is in plasma?
55% in blood
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spun tube of blood yields three layers
plasma on top, buffy coat, erythrocytes on bottom
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composition of plasma
\n straw-colored sticky fluid, about 90% water
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most abundant solutes
plasma proteins
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plasma proteins produced mostly by
liver
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albumin
makes up 60% of plasma proteins, functions as carrier of other molecules as blood buffer and contributes to plasma osmotic pressure
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formed elements
erythrocytes, leukocytes, platelets
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leukocytes
complete cells
complete cells
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erythrocytes
no nuclei or organelles
no nuclei or organelles
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platelets
cell fragments
cell fragments
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most formed elements survive in bloodstream for
only a few days
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most blood cells originate in
bone marrow and do not divide
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what is an erythrocytes
small cells that contribute to gas transport
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erythrocytes are filled with
hemoglobin (Hb) for gas transport
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hemoglobin
red heme pigment bound to protein globin
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globin
is composed of four polypeptide chains
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heme pigment
is bonded to each globin chain

\-gives blood red color
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each heme's central iron atom
binds one o2
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each Hb carries
four o2
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cycle of Hb
Hb gets o2 in lungs, unloads o2 in tissues, picks up some co2 to release in lungs
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hematopoiesis
formation of all blood cells, occurs in red bone marrow
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hematopoiesis in adults
found in axial skeleton, girdles, and proximal epiphyses of humerus and femur
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hematopoietic stem cells (hemocytoblasts)
stem cells that gives rise to all formed elements
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producing erythrocytes takes
15 days
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why do some athletes abuse artificial erythropoietin (EPO)
increases hematocrit which increase stamina and performance
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dangers of abusing EPO
increasing hematocrit thickens blood which causes clotting, stroke, or heart failure
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life span of erythrocytes
100-120 days
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erythrocyte do not
grow, divide, make new proteins
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when erythrocytes are aged
become fragile, Hb degenerates
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macrophages in spleen
break down these RBCs
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two erythrocyte disorders
anemia and polycythemia
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anemia
blood does not carry enough o2
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cause of anemia
blood loos, not enough RBCs produced, too many RBCs being destroyed
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hemorrhagic anemia
rapid blood loss- trauma
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chronic hemorrhagic anemia
slight but persistent blood loss
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not enough RBCs produced
iron-deficiency anemia, low iron intake, poor absorption, kidney disfunction
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too many RBCs destroyed
premature lysis of RBCs, incompatible transfusions or infections

sickle cell anemia
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sickle cell anemia
RBCs become crescent shaped when o2 levels are low, misshape RBCs rupture easily and block small vessels
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polycythemia
excess of RBCs; increases blood viscosity, causing blood flow
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polycythemia vera
bone marrow cancer leading to excess RBCs, hematocrit may go as high as 80%
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treatment for polycythemia vera
therapeutic phlebotomy
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secondary polycythemia
caused by low o2 levels (example: high altitude) or increased EPO production
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leukocytes
function in defense against disease
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leukocytes increase in number
in response to infection
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two major categories O leukocytes
granulocytes and agranulocytes
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which contain visible cytoplasmic granules (granulocytes or agranulocytes)
granulocytes
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granulocytes
larger and shorter lived than RBCs, contain lobed nuclei, all are phagocytic to some degree
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life span of granulocytes
hours to days
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three types of granulocytes
neutrophils, eosinophils, basophils
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neutrophils
most numerous WBCs- 50-70%, kill microbes by process called respiratory burst
most numerous WBCs- 50-70%, kill microbes by process called respiratory burst
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eosinophils
2-4% of all leukocytes, Red-staining granules contain digestive

enzymes• Release enzymes on large parasitic worms,

digesting their surface• Also play role in allergies and immune response
2-4% of all leukocytes, Red-staining granules contain digestive

enzymes• Release enzymes on large parasitic worms,

digesting their surface• Also play role in allergies and immune response
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basophils
rarest WBCs, 0.5-1%, Nucleus deep purple with one to two

constrictions

Large, purplish black (basophilic) granules

contain histamine
rarest WBCs, 0.5-1%, Nucleus deep purple with one to two

constrictions

Large, purplish black (basophilic) granules

contain histamine
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histamine
inflammatory chemical that acts as vasodilator and attracts WBCs to inflamed sites
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Agranulocytes
lack visible cytoplasmic granules, both have spherical or kidney shaped nuclei
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life span of arganulocytes
hours to years
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two types of agranulocytes
lymphocytes and monocytes
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lymphocytes
found in lymph tissue
found in lymph tissue
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what are the two types of lymphocytes
T cells and B cells
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T lymphocytes (T cells)
act against virus- infected cells and tumor cells
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B lymphocytes (B cells)
give rise to plasma cells which produce antibodies
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monocytes
abundant pale blue cytoplasm, dark purple-staining, U- or kidney-shaped nuclei, leave circulation, enter tissues, and differentiate into macrophages, actively phagocytic, activate lymphocytes to mount an immune response
abundant pale blue cytoplasm, dark purple-staining, U- or kidney-shaped nuclei, leave circulation, enter tissues, and differentiate into macrophages, actively phagocytic, activate lymphocytes to mount an immune response
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leukocyte production
all originate from hemocytoblast stem cell that branches into two pathways
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lymphoid stem cells
produces lymphocytes
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myeloid stem cells
produce all other elements
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leukemia
immature, nonfunctional WBCs flood bloodstream, cancerous cells fill red bone marrow, crowding out other cell lines, leads to anemia and bleeding
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mononucleosis
highly contagious viral disease, usually seen in young adults, caused by Epstein-Barr virus, results in high numbers of typical aranuocytes,
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platelets
cytoplasmic fragments of megakaryocytic
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function of platelets
form temporary platelet plug that helps seal breaks in blood vessels
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Platelets life span
age quickly and degenerate in about 10 days
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hemostasis
processes that stop bleeding
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first step of clot formation
vascular spasm- smooth muscle contracts causing vasoconstriction
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second step of clot formation
platelet plug formation- injury to lining of vessel exposes collagen fibers; platelets adhere, platelets release chemicals that make nearby platelets sticky; plates plug forms
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third step of clot formation
coagulation- fibrin forms a mesh that traps red blood cells and platelets forming the clot
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thromboembolic disorders
undesirable clot formation
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thrombus
clot that develops and persists in unbroken blood vessel, may block circulation, leading to tissue death
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embolus
thrombus freely floating in bloodstream