Such an interesting question! Arguably, blood can be considered an
organ, or a body fluid. I found blood described as both, but overall,
blood is not popularly considered to be an organ.
Organ: ?Biology. A differentiated part of an organism, such as an eye,
wing, or leaf, that performs a specific function.?
?Part of a living thing, distinct from the other parts, that is
adapted for a specific function. Organs are made up of tissues and are
grouped into systems, such as the digestive system.?
?a fully differentiated structural and functional unit in an animal
that is specialized for some particular function?
· circulatory system
· digestive system
· endocrine system
· immune system
· integumentary system
· lymphatic system
· muscular system
· nervous system
· reproductive system
· respiratory system
· skeletal system
· urinary system
The bodily system consisting of the heart, blood vessels, and blood
that circulates blood throughout the body, delivers nutrients and
other essential materials to cells, and removes waste products. Also
called cardiovascular system.? ?circulatory system, group of organs
that transport blood and the substances it carries to and from all
parts of the body. The circulatory system can be considered as
composed of two parts: the systemic circulation, which serves the body
as a whole except for the lungs, and the pulmonary circulation, which
carries the blood to and from the lungs. The organs of circulatory
system consist of vessels that carry the blood and a muscular pump,
the heart, that drives the blood.?
a. ?· The fluid consisting of plasma, blood cells, and platelets that
is circulated by the heart through the vertebrate vascular system,
carrying oxygen and nutrients to and waste materials away from all
b. A functionally similar fluid in animals other than vertebrates.
c. The juice or sap of certain plants.
· A vital or animating force; lifeblood.
· One of the four humors of ancient and medieval physiology,
identified with the blood found in blood vessels, and thought to cause
?Because it contains living cells, blood is alive. Red blood cells and
white blood cells are responsible for nourishing and cleansing the
body. Since the cells are alive, they too need nourishment. Vitamins
and Minerals keep the blood healthy. The blood cells have a definite
life cycle, just as all living organisms do.?
?Blood: The familiar red fluid in the body that contains white and red
blood cells, platelets, proteins, and other elements. The blood is
transported throughout the body by the circulatory system. Blood
functions in two directions: arterial and venous. Arterial blood is
the means by which oxygen and nutrients are transported to tissues
while venous blood is the means by which carbon dioxide and metabolic
by-products are transported to the lungs and kidneys, respectively,
for removal from the body.?
?(1) the various structures may be separately considered?systematic
anatomy; or (2) the organs and tissues may be studied in relation to
one another?topographical or regional anatomy.?
? SYSTEMATIC ANATOMY.?The various systems of which the human body is
composed are grouped under the following headings:
1. Osteology?the bony system or skeleton.
2. Syndesmology?the articulations or joints.
3. Myology?the muscles. With the description of the muscles it is
convenient to include that of the fascić which are so intimately
connected with them.
4. Angiology?the vascular system, comprising the heart, blood vessels,
lymphatic vessels, and lymph glands.
5. Neurology?the nervous system. The organs of sense may be included
in this system.
6. Splanchnology?the visceral system. Topographically the viscera form
two groups, viz., the thoracic viscera and the abdomino-pelvic
viscera. The heart, a thoracic viscus, is best considered with the
vascular system. The rest of the viscera may be grouped according to
their functions: (a) the respiratory apparatus; (b) the digestive
apparatus; and (c) the urogenital apparatus. Strictly speaking, the
third subgroup should include only such components of the urogenital
apparatus as are included within the abdomino-pelvic cavity, but it is
convenient to study under this heading certain parts which lie in
relation to the surface of the body, e. g., the testes and the
external organs of generation.?
Gray?s Anatomy, lists the heart, the blood vessels, th elympatic
vessels, and lymph glands as making up the vascular system. Blood is
These sites say ?NO?
Organs of the body
?Appendix, Bladder, Brain, Gallbladder, Female genitals, Heart,
Kidneys, Large intestine, Liver, Lungs, Male genitals, Pancreas, Skin,
Spleen, Small intestine, Stomach, Voice box?
<haematology> Considered a circulating tissue composed of a fluid
portion (plasma) with suspended formed elements (red blood cells,
white blood cells, platelets).
Arterial blood is the means by which oxygen and nutrients are
transported to tissues, venous blood is the means by which carbon
dioxide and metabolic by-products are transported for excretion.?
?1 : the fluid that circulates in the heart, arteries, capillaries,
and veins of a vertebrate animal carrying nourishment and oxygen to
and bringing away waste products from all parts of the body
2 : a fluid of an invertebrate comparable to blood?
See the organs in their places:
Organ: : a differentiated structure (as a heart or kidney) consisting
of cells and tissues and performing some specific function in an
These sites say ?YES?
Blood, the sticky red fluid three times thicker than water, is the
body's transport system, circulating continuously throughout its
intricate network of veins, arteries and capillaries. One small drop
contains 250 million cells.
Cells group together in the body to form tissues - a collection of
similar cells that group together to perform a specialized function.
There are 4 primary tissue types in the human body: epithelial tissue,
connective tissue, muscle tissue and nerve tissue.?
Organs are the next level of organization in the body. An organ is a
structure that contains at least two different types of tissue
functioning together for a common purpose. There are many different
organs in the body: the liver, kidneys, heart, even your skin is an
No other organ travels the body. Blood passes through the heart
(organ), to the lung (organ), to the kidneys (organ), to the liver
(organ), to the brain (organ), to the genitals (organ), the
intestines(organ), skin (organ), etc.
The adult human body contains about 5 quarts of blood, while skin
accounts for 15 percent of body weight. Skin still wins as the largest
While blood may technically meet the criteria of being an organ, it is
generally not considered an organ. I do not consider blood to be an
organ. Organs are fairly stationary, while blood circulates, cleans,
oxygenates, carries wastes, hormones, vitamins, lipids, electrolytes,
and minerals. When we get another?s blood, it is called a transfusion,
not an organ transplant. In autopsy reports, organs are weighed and
noted on the report. Blood is not.
There you go! I hope this has adequately answered your question. If
not, please request an Answer Clarification, before rating this
answer. This will enable me to assist you further, if possible.
Organs + body
Blood + organ