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Midterm 3 Fill In
Physiology 2420
| Question | Answer |
|---|---|
| In order to determine hematocrit levels, whole blood is centrifuged and separates into three layers. These layers are? | 1. Buffy coat 2. plasma 3. erythrocytes |
| Define the term hemostasis | stoppage of bleeding |
| What in anemia? | Lack of RBC's Decrease in oxygen carrying capacity |
| What are the three classes of plasma proteins? | albumin, globulin, fibrinogen |
| What causes the first sounds in a heartbeat? | blood rushing though the AV valves as they are closing |
| During the repolarization phase of an autorhythmic cell action potential, which ion is moving out of the cell? | K+ |
| During the repolarization phase of the contractile cell action potential, which ion channels inactivate? | calcium L-type channels |
| In excitation-contraction coupling in cardiac cells, name one way calcium is removed from the cytosol | Na+/Ca2+ calcium exchanger, Ca2+ ATPase in SR, Ca2+ ATPase in plasma membrane |
| What type of blood vessel has the highest compliance? | vein |
| What type of blood vessel is known as the pressure reservoir? | arterie |
| What is the difference between active and reactive hyperemia? | active is due to increased metabolic activity and reactive is due to blockage or vasodilation |
| In terms of blood vessels, what is compliance? | ability to store pressure with increased volume |
| Resistance to blood flow is regulated primarily by what blood vessels? | arterioles |
| Name two ways you could alter the mean arterial pressure | increase cardiac output increase total peripheral resistance |
| In blood pressure measurement, two pressures are listed as a fraction. What are they? | systolic (ventricular contraction) diastolic (ventricular relaxation) |
| Change in vascular resistance (vasoconstriction) in response to stretch of blood vessels (i.e. increased blood flow) in absence of any external factors is the definition of what? | viscosity |
| Name two blood vessels that are part of microcirculation? | venules, capillaries |
| Blood flow through which blood vessel type has the slowest velocity? | capillaries |
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GracieLou
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