Human ANAPHY 10th ed

1. Seeley’s
ESSENTIALS OF
Anatomy &
Physiology
Tenth Edition
Cinnamon Vanputte
Jennifer Regan
Andrew Russo
See separate PowerPoint slides for all figures and tables
pre-inserted into PowerPoint without notes.
© 2019 McGraw-Hill Education. All rights reserved. Authorized only for instructor use in the classroom. No reproduction or further distribution permitted without the prior written consent of McGraw-Hill Education.

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Chapter 11
Blood
Lecture Outline

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Functions of Blood
1. Transport of gases, nutrients and waste
products
2. Transport of processed molecules
3. Transport of regulatory molecules
4. Regulation of pH and osmosis
5. Maintenance of body temperature
6. Protection against foreign substances
7. Clot formation

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Composition of Blood1
Plasma:
• 55% of total blood
• pale, yellow liquid that surrounds cells
• 91% water, 7% proteins, and 2% other
Formed Elements:
• 45% of total blood
• cells and cell fragments
• erythrocytes, leukocytes, thrombocytes

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Plasma Proteins
Albumin:
• 58% of plasma proteins
• helps maintain water balance
Globulins:
• 38% of plasma proteins
• helps immune system
Fibrinogen:
• 4% of plasma proteins
• aids in clot formation

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Composition of Blood2
Figure 11.1
©liquidlibrary/PictureQuest RF

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Hematopoiesis1
Hematopoiesis is the process that produces
formed elements.
In the fetus, hematopoiesis occurs in several
tissues, including the liver, thymus, spleen,
lymph nodes, and red bone marrow.
After birth, hematopoiesis is confined primarily
to red bone marrow, but some white blood cells
are produced in lymphatic tissues.

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Hematopoiesis2
All the formed elements of blood are derived
from a single population of cells called stem
cells, or hemocytoblasts.
These stem cells differentiate to give rise to
different cell lines, each of which ends with the
formation of a particular type of formed
element.

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Hematopoiesis3
Figure 11.2

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Erythrocytes
Red blood cells (RBC)
Disk-shaped with thick
edges
Nucleus is lost during
development
Live for 120 days
Function:
transport O2 to tissues
Figure 11.3
(a) ©National Cancer Institute/Science Source

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Hemoglobin1
Main component of erythrocytes
Transports O2
Each globin protein is attached to a heme
molecule
Each heme contains one iron atom
O2 binds to iron
Oxyhemoglobin:
• hemoglobin with an O2 attached

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Hemoglobin2
Figure 11.4

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Production of Erythrocytes
1. Decreased blood O2 levels cause kidneys to
increase production of erythropoietin.
2. Erythropoietin stimulates red bone marrow to
produce more erythrocytes.
3. Increased erythrocytes cause an increase in
blood O2 levels.

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Red Blood Cell Production
Figure 11.5

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Fate of Old Erythrocytes and
Hemoglobin
Old red blood cells are removed from blood by
macrophages in spleen and liver
Hemoglobin is broken down
Globin is broken down into amino acids
Hemoglobin’s iron is recycled
Heme is converted to bilirubin
Bilirubin is taken up by liver and released into
small intestine as part of bile

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Hemoglobin Breakdown
Figure 11.6

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Leukocytes
White blood cells (WBC)
Lack hemoglobin
Larger than erythrocytes
Contain a nucleus
Functions:
• fight infections
• remove dead cells and debris by phagocytosis

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Types of Leukocytes1
Granulocytes: contain specific granules and
include neutrophils, eosinophils, and basophils
1. Neutrophils:
• most common
• remain in blood for 10 to 12 hours then move to
tissues
• phagocytes

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Types of Leukocytes2
2. Eosinophils:
• reduce inflammation
• destroy parasites
3. Basophils:
• least common
• release histamine and heparin

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Types of Leukocytes3
Agranulocytes: no specific granules
1. Monocytes:
• largest sized white blood cells
• produce macrophages
2. Lymphocytes:
• immune response
• several different types (T cells and B cells)
• lead to production of antibodies

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Types of White Blood Cells
Figure 11.8
(a–e) ©Victor Eroschenko

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Platelets
Platelets are minute fragments of cells, each
consisting of a small amount of cytoplasm
surrounded by a cell membrane.
They are produced in the red bone marrow from
large cells called megakaryocytes.
Small fragments break off from the megakaryocytes
and enter the blood as platelets.
Platelets play an important role in preventing blood
loss.

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Blood Loss
When blood vessels are damaged, blood can
leak into other tissues and disrupt normal
function.
Blood that is lost must be replaced by
production of new blood or by a transfusion.

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Preventing Blood Loss
1. Vascular spasm:
• temporary constriction of blood vessel
2. Platelet plugs:
• can seal up small breaks in blood vessels
3. Blood clotting (coagulation)

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Vascular Spasm
Vascular spasm is an immediate but temporary
constriction of a blood vessel that results when
smooth muscle within the wall of the vessel
contracts.
This constriction can close small vessels completely
and stop the flow of blood through them.
Vascular spasm is stimulated by chemicals released
by cells of the damaged blood vessel wall and by
platelets.

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Platelet Plug Formation1
A platelet plug is very important in maintaining the
integrity of the damaged blood vessels.
The formation of a platelet plug can be described as
a series of steps, but in actuality many of these
steps occur at the same time.
Platelet adhesion occurs first, when platelets stick
to the exposed collagen in the damaged blood
vessel wall.
After platelets adhere to collagen, they become
activated, change shape, and release chemicals.

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Platelet Plug Formation2
In platelet aggregation, fibrinogen forms bridges
between the fibrinogen receptors of numerous
platelets, resulting in a platelet plug.

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Platelet Plug Formation3
Figure 11.9

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Blood Clotting
Blood can be transformed from a liquid to a gel
Clot:
• network of thread-like proteins called fibrin that trap
blood cells and fluid
• depends on clotting factors
Clotting factors:
• proteins in plasma
• only activated following injury
• made in liver
• require vitamin K

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Steps in Clot Formation
1. Injury to a blood vessel causes inactive clotting
factors to become activated due to exposed conn.
tissue or release of thromboplastin
2. Prothrombinase (clotting factor) is formed and acts
upon prothrombin
3. Prothrombin is switched to its active form thrombin
4. Thrombin activates fibrinogen into its active form
fibrin
5. Fibrin forms a network that traps blood (clots)

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Clot Formation
Figure 11.10

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Clot Formation Control
Clots need to be controlled so they don’t spread
throughout the body
Anticoagulants:
• prevent clots from forming
• Example - heparin and antithrombin
Injury causes enough clotting factors to be
activated that anticoagulants can’t work in that
particular area of the body

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Clot Retraction and Fibrinolysis
Clot retraction:
• condensing of clot
• serum in plasma is squeezed out of clot
• helps enhance healing
Fibrinolysis:
• process of dissolving clot
• plasminogen (plasma protein) breaks down clot
(fibrin)

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Fibrinolysis
Figure 11.11

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Blood Grouping
Injury or surgery can lead to a blood transfusion
Transfusion reactions/Aggulination:
• clumping of blood cells (bad)
Antigens:
• molecules on surface of erythrocytes
Antibodies:
• proteins in plasma
Blood groups:
• named according to antigen (ABO)

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ABO Blood Groups1
In the ABO blood group system, there are two types
of antigens that may appear on the surface of the
red blood cells, type A antigen and type B antigen.
Type A blood has type A antigens, type B blood has
type B antigens, and type AB blood has both types
of antigens.
Type O blood has neither A nor B antigens.
The types of antigens found on the surface of the
red blood cells are genetically determined.

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ABO Blood Groups2
Antibodies against the antigens are usually
present in the plasma of blood.
Plasma from type A blood contains anti-B
antibodies, which act against type B antigens;
plasma from type B blood contains anti-A
antibodies, which act against type A antigens.
Type AB blood plasma has neither type of
antibody, and type O blood plasma has both
anti-A and anti-B antibodies.

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ABO Blood Groups3
In Caucasians in the United States, the
distribution is type O, 47%; type A, 41%; type B,
9%; and type AB, 3%.
Among African-Americans, the distribution is
type O, 46%; type A, 27%; type B, 20%; and type
AB, 7%.

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ABO Blood Groups
Figure 11.12

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Agglutination Reaction
Figure 11.13

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Blood Donor and Recipient
According to ABO Blood Types
O are universal donors because they have no
antigens
Type A can receive A and O blood
Type B can receive B and O blood
Type AB can receive A, B, AB blood
Type O can only receive O blood

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Rh Blood Group
Rh positive means you have Rh antigens
95 to 85% of the population is Rh+
Antibodies only develop if an Rh- person is
exposed to Rh+ blood by transfusion or from
mother to fetus

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Rh Incompatibility in Pregnancy
If mother is Rh- and fetus is Rh+ the mother can
be exposed to Rh+ blood if fetal blood leaks
through placenta and mixes with mother’s blood.
First time this occurs mother’s blood produces
antibodies against antigens.
Any repeated mixing of blood causes a reaction.

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Hemolytic Disease of Newborn1
This condition
• occurs when mother produces anti-Rh antibodies
that cross placenta and agglutination and hemolysis
of fetal erythrocytes occurs
• can be fatal to fetus
• prevented if mother is treated with RhoGAM which
contains antibodies against Rh antigens

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Hemolytic Disease of Newborn2
Figure 11.14

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Diagnostic Blood Tests
Complete blood count:
• provides information such as RBC count,
hemoglobin, hematocrit, and WBC count
Hematocrit:
• % of total blood volume composed of RBC
Hemoglobin:
• determines amount of hemoglobin
• indicate anemia

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Hematocrit
Figure 11.15

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Diagnostic Blood Tests2
Prothrombin time:
• time it takes for blood to begin clotting (9 to 12 sec.)
White blood cell count:
• total number of white blood cells

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Diagnostic Blood Tests3
White blood cell differential count:
• Determines the % of each 5 kinds of leukocytes
• neutrophils: 60 to 70%
• lymphocytes: 20 to 25%
• monocytes: 3 to 8%
• eosinophils: 2 to 4%
• basophils: 0.5 to 1%

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White Blood Cell Disorders
Leukopenia:
• low white blood cell count
• caused by radiation, chemotherapy drugs, tumors,
viral infections
Leukocytosis:
• high white blood cell count
• caused by infections and leukemia