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Physiology
Whar are the five components of hemostasis?
Haemostasis
1) Vessels
2) Platelets (Injured vessel exposes collagen that initiates platelet aggregation)
3) Coagulation factors (clot forming) 4) Coagulation inhibitors (clot controlling)
5) Fibrinolysis (clot dissolving)
Physiology
Lifespan of platelets
Life span - 10 days
Physiology
What is the normal number of platelets and where are they stored?
Normal number : 150 – 300 x 109/l
Stored in spleen (30%)
Physiology
Circulation : components
• Heart (the pump)
• Blood vessels (the conduits)
– Arteries;
– Arterioles;
– Capillaries;
– Veins;
– Venules;
• Blood (the transport medium)
– Blood cells, plasma
Physiology
which subdivisions exist of the circulatory system?
2 subdivisions of the circulatory system : the cardiovascular
system (heart and blood vessels) and the lymphatic system (lymphatic vessels
and lymphoid tissues).
Physiology
functions of the circulatory system
Transport of nutrients, metabolites,
gases, hormones;etc.
Assists in :
• temperature regulation;
• pH regulation;
• urine formation;
• response to infections.
=> Serves to maintain an appropriate
environment in all the tissue fluids
Physiology
blood / heart :
The arterial PO2 is predicted to be reduced to some extent from
ventilation- perfusion
Physiology
Blood?
Which of the following statemnts is true?
a. Control of thirst is one of the function of the kidneys
b. The afferent arteriole delivers blood to the glomerular capillaries
c. The glomerulus in a juxtamedullary nephron is located in the medulla of the kidney.
b. The afferent arteriole delivers blood to the glomerular capillaries
Physiology
Blood-
Is this statement wrong or false ?
A large reticulocyte count in the blood could indicate that there is a low production of erythrocytes.
wrong
Physiology
blood ?
In peripheral capillaries, more O2 can be unloaded from blood at given PO2 when:
POC2 is increased
Physiology
Increasing the tidal volume, while keeping evertything else constant will increase the :
alveolar ventilation
Physiology
which ions are most important for establishing the resting membrane potential (RMP)
K+ ions
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