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 Blood is a
that contains both dissolved substances and
specialized cells.
 The four functions of blood include:
oxygen from the lungs, nutrients from the digestive tract, and waste
products (urea & CO2) from tissues.
the body’s internal environment (via transporting hormones & heat).
3. helping to
(via transporting antibodies & Phagocytes).
to repair damaged blood vessels.
Identify five things are transported by the blood
Blood Plasma
 The body has
o About
o The other
—a straw-colored fluid.
 Plasma is
 and 10% dissolved gases, salts, nutrients, enzymes, hormones, waste products, and plasma
Blood Cells
 The cellular portion of blood consists of:
Red Blood Cells
 The
in the blood are the
 Red blood cells are called
 Red blood cells
 Red blood cells get their
 Hemoglobin is an
tissues of the body.
 Red blood cells look like disks that are thinner in the center.
 They are produced in
 They have
 They live for about
 Then they are destroyed by the
from the lungs to
White Blood Cells – Leukocytes & Lymphocytes
 White blood cells do not contain hemoglobin.
 They are
than red cells.
 White blood cells are produced in
 They
 White blood cells may live for days, months, or years.
 White blood cells are the “army” of the circulatory system—they
o guard against infection,
o fight parasites,
o attack bacteria.
 There are many types of white blood cells.
engulf (eat) and digest bacteria and other disease-causing
 Antibodies are essential to fighting infection and help to produce immunity to many diseases.
Outline the composition of blood
Review Questions
1. Most of the oxygen in human blood is transported by:
a) Plasma
b) Serum
c) Platelets
d) Hemoglobin
e) Leukocytes
2. Which of the following is not a function of blood?
a) Carries oxygen and nutrients to cells
b) Returns fluid leaked from blood vessels and reclaimed proteins to the circulatory system
c) Carries hormones and metabolic wastes
d) Equalizes body temperature through heat transfer
e) Contains phagocytic cells that scavenge and fight infection
3. Hemoglobin contains:
a) Copper
b) Magnesium
c) Sodium
d) Calcium
e) Iron
4. The cells responsible for defense against infections are
a) Red blood cells
b) White blood cells
c) Epithelial cells
d) Platelets
e) Pacemaker cells
5. The primary sealants that plug leaks in blood vessels are
a) Platelets and fibrin
b) Red blood cells and albumin
c) Fibrin and white blood cells
d) White blood cells and platelets
e) Hemoglobin and platelets