BIOS 255n DeVry All Week Discussions

BIOS 255n DeVry All Week Discussions
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BIOS 255n DeVry All Week Discussions
BIOS255
BIOS 255n Week 1 Discussion 1
The Heart (graded)
The human heart is a four-chambered hydraulic pump. A hydraulic pump uses differences in pressure to move material
from areas of higher pressures to areas of lower pressures. The pressure differences created by the heart move blood
between the chambers and the circulatory systems. Let’s begin our discussion by identifying the chambers of the heart
and their functions, the associated valves, and the names and general route of their associated great vessels.
BIOS 255n Week 1 Discussion 2
The Contraction Cycle (graded)
The contraction cycle of the heart is the series of events that occurs during one heartbeat. Each beat of the heart
includes the contraction (systole) and relaxation (diastole) of the atria and then the ventricles. Let’s begin the
examination of this cycle by discussing electrical conduction through the heart.
BIOS 255n Week 2 Discussion 1
Blood Vessel Structure (graded)
Let’s start by discussing the structure of our blood vessels. Let’s each take a characteristic of (1) arteries, (2) veins, or
(3) capillaries. Build upon what your classmates say to enable us to have a more full understanding of these vessels
that are essential for our existence.
BIOS 255n Week 2 Discussion 2
Blood Flow Dynamics (graded)
Cardiac output is the amount of blood ejected from the left or right ventricle in any given minute. Cardiac output must
be maintained in order to keep sufficient blood flow through the capillaries. Identify the factors that directly affect blood
flow in the circulatory system.
BIOS 255n Week 3 Discussion 1
Whole Blood (graded)

Describe the composition, physical characteristics, and functions of whole blood. Explain why it is classified as a
connective tissue.
BIOS 255n Week 3 Discussion 2
Liquid Connective Tissue (graded)
Explain the similarities and differences among serum, lymph, and plasma. Each student should take one characteristic
of the fluid, extracellular component of this connective tissue and explain how it relates to the other liquids.
BIOS 255n Week 4 Discussion 1
The Lymphatic System (graded)
How do the various components of the lymphatic system operate? We have talked about many organ systems. In what
ways are components of the lymphatic system involved in many other organ systems? Try to focus on one element of
this system and provide an in-depth view of its contribution to our overall health.
BIOS 255n Week 4 Discussion 2
Nonspecific Immunity (graded)
How do the various elements of the nonspecific immune system function in providing daily protection against a variety
of pathogens? Each student should provide a unique aspect of the nonspecific immune system and educate the rest
of us concerning its function and how effective (or ineffective) it is against one class of pathogens.
BIOS 255n Week 5 Discussion 1
B and T Cells (graded)
Our knowledge and understanding of the various forms of lymphocytes continue to expand. Our initial discussion this
week will be on the various forms of B and T cells — each of us should take one class of lymphocytes and explain it’s
role in the adaptive immune process. As you comment on other students’ postings be sure to add additional insight into
the mechanisms of the subclass of cell and its interactions with both components of the innate and other aspects of the
adaptive immune system.
BIOS 255n Week 5 Discussion 2
Vaccinations – Friend or Foe (graded)
Recently a number of individuals have claimed that adjuvants, such as thymersol in vaccines, lead to the development
of a variety of disorders, such as autism. Although these initial claims have not been substantiated and have since
been withdrawn from the scientific literature, the concern continues today. How would you counsel parents concerning
vaccination? Discuss the issue of herd immunity and the risks in our modern society related to refusal to provide
vaccinations.
BIOS 255n Week 6 Discussion 1
Respiratory Anatomy (graded)
Describe the anatomy and histology of the respiratory system and how each of the functions are related.
BIOS 255n Week 6 Discussion 2

Breathing (graded)
Describe the events that cause inhalation and exhalation and how Boyle’s law relates to the events.
BIOS 255n Week 7 Discussion 1
Transport of Gases (graded)
Describe how oxygen and carbon dioxide are transported in the blood, and explain how their loading and unloading is
affected by temperature, pH, BPG, and PCO2.
BIOS 255n Week 7 Discussion 2
Respiratory Diseases (graded)
Compare the causes and consequences of chronic bronchitis, emphysema, asthma, and lung cancer. Once we have
made these comparisons then we should follow up on other disorders that affect either the upper or lower respiratory
systems. Be sure to comment on others postings in terms of new information that can contribute to a more complete
understanding of the diseases you pick.