bios 255 aampp 3 final filled out final exam review
chamberlain college of nursing
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BIOS 255 A&P 3 FINAL filled out-Final exam review
BIOS 255-Anatomy and Physiology III with Lab
Anatomy and Physiology III
Chamberlain College of Nursing
,Bios 255 Final exam review
Be familiar with left and right sided heart failure and what the consequences are (remember the case
study that we did in lecture and lab?)
(698) Left side: One cause of mitral insufficiency, in which there is backflow of blood from the left
ventricle into the left atrium, is mitral valve prolapse (MVP). In MVP one or both cusps of the mitral valve
protrude into the left atrium during ventricular contraction. Mitral valve prolapse is one of the most
common valvular disorders, affecting as much as 30% of the population. It is more prevalent in women
than in men, and does not always pose a serious threat. The left side of the heart receives blood rich in
oxygen from the lungs and pumps it to the remainder of the body. As the ability to pump blood forward
from the left side of the heart is decreased, the remainder of the body does not receive enough oxygen
especially when exercising. This results in fatigue. In addition, the pressure in the veins of the lung
increases, which may cause fluid accumulation in the lung. This results in shortness of
breath and pulmonary edema.
Right side: In aortic stenosis the aortic valve is narrowed, and in aortic insufficiency there is backflow of
blood from the aorta into the left ventricle.
In right-sided heart failure, the right ventricle loses its pumping function, and blood may back up into
other areas of the body, producing congestion. Congestion affects the liver, the gastrointestinal tract, and
the limbs. In addition, the right ventricle may be unable to pump blood efficiently to the lungs and to the
left ventricle.
Causes of right-sided heart failure include left-sided heart failure and lung diseases such as chronic
bronchitis and emphysema. Other causes include congenital heart disease, clots in pulmonary
arteries, pulmonary hypertension, and heart valve disease.
Know the different types of immunity – active vs passive, natural vs artificial.
First, let us define the following terms and then we can put them together. The term active generally
means that your body is producing antibodies by exposure. Passive is a term where the antibodies are
being transferred to you, i.e. breast milk IgA to infant. Natural terms the introduction of the antigen via
exposure. Artificial is the introduction of antigens/antibodies via an altered state of the microbe/
antibody.
Naturally Acquired Active Immunity- Following exposure to a microbe, antigen recognition by B cells
and T cells and costimulation lead to formation of antibody-secreting plasma cells, cytotoxic T cells, and
B and T memory cells.
Naturally Acquired Passive Immunity- IgG antibodies are transferred from mother to fetus across
placenta, or IgA antibodies are transferred from mother to baby in milk during breastfeeding.
Artificially Acquired Active Immunity- Antigens introduced during vaccination stimulate cell-mediated
and antibody-mediated immune responses, leading to production of memory cells. Antigens are
pretreated to be immunogenic but not pathogenic (they will trigger an immune response but not cause
significant illness.)
,Artificially Acquired Passive Immunity- Intravenous injection of immunoglobulins.
*****Know the neural mechanisms of respiratory control including the DRG and PRG.
(872) Respiratory center- Neurons in the pons and medulla oblongata of the brain stem that regulate
breathing. It is divided into the medullary respiratory center and the pontine respiratory center.
Within the medullary respiratory center, you find two respiratory groups, the ventral respiratory group
(AKA expiratory area) and the dorsal respiratory group (AKA inspiratory area). The DRG generates
impulses to the diaphragm via the phrenic nerves and the external intercostals via the intercostal nerves.
These impulses trigger contraction of these muscles which in turn execute inhalation. When the nerves
are not firing, this passive relaxation allows recoil of the lungs and thoracic wall, passive exhalation. The
VRG is only activated during forceful inhalation and trigger the accessory muscles to work. An important
part of the VRG is the Pre-Botzinger Complex which is believed to be important in the generation of the
rhythm of breathing (Pacemaker cells)
.
PRG (Pontine Respiratory Group)- A collection of neurons in the pons that transmits nerve impulses
to the dorsal respiratory group, and may modify the basic rhythm of breathing. (AKA pneumotaxic
area) The PRG may play a role in both inhalation and exhalation by modifying the basic rhythm of
breathing generated by the VRG, as when exercising, speaking, or sleeping.
Know the process of inhalation and exhalation (the steps involved)
(FIG. 24.13) During Inhalation, the diaphragm contracts and the external intercostals contract. The chest
cavity expands, and the alveolar pressure drops below atmospheric pressure. Air flows into the lungs in
response to the pressure gradient and the lung volume expands. During deep inhalation, the scalene and
sternocleidomastoid muscles expand the chest further, thereby creating a greater drop in alveolar
pressure.
During exhalation, the diaphragm relaxes and the external intercostals relax. The chest and lungs recoil,
the chest cavity retracts, and the alveolar pressure increases above atmospheric pressure. Air flows out
of the lungs in response to the pressure gradient, and the lung volume decreases. During forced
exhalations, the internal intercostals and the abdominal muscles contract, thereby reducing the size of
the chest cavity further and creating a greater increase in alveolar pressure.
, Inhalation:
• Diaphragm: contracts & moves down
• Intercostal muscles: contract, move ribs out
• Chest volume: increases
• Pressure in lungs: decreases
• Air Flow: higher percentage of
oxygen Exhalation:
• Diaphragm: relaxes & moves up
• Intercostals muscles: relax, move ribs in.
• Chest volume: lessens
• Pressure in lungs: increases
• Air flow: carbon dioxide out
*******Know the functions of the lymphatic and immune systems.
*****The primary functions of the lymphatic is system is to 1. Drain excess interstitial fluid, 2. Transport
dietary lipids and lipid-soluble vitamins, and 3. Carry out immune response.
Know the precursor cells for platelets, lymphocytes, etc.
The precursor cells for platelets are megakaryocytes.
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