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Midterm 3 Practice

Physiology 2420

The primary site of exchange between blood and interstitial fluid occurs across what type of blood vessel? capillaries
Blood supply to the heart comes from __________. coronary arteries
Chordae tendinae are strands of connective tissue extending from _____________ to ______________. AV valves : papillary muscle
What blood vessel carries deoxygenated blood to the lungs? pulmonary artery
Conduction through which of the following is slow to allow atria to contract before the ventricles? AV Node
The rapid depolarization phase of a pacemaker cell action potential is caused by which of the following types of ion movement? movement of calcium through L-type channels
What causes the rapid depolarization phase of a contractile cell action potential? sodium movement into the cell
The elastic recoil of its walls during diastole causes a continuation of blood flow throughout the cardiac cycle. Which blood vessel? Artery
What component of an ECG represents ventricular depolarization? QRS xomplex
These blood vessels are slightly larger than capillaries and allow some exchange between blood and the tissue Venule
Its high compliance allows it to hold a large volume of blood with little change in pressure. Which blood vessel? Vein
An increase in the volume of blood ejected from the heart, with no change in total peripheral resistance, would ______________. elevate mean arterial pressure
What blood cell contains B cells and T cells? lymphocytes
This blood cell is the most abundant phagocyte in blood. neutrophil
This blood cell differentiate into macrophages in the tissue. monocyte
What triggers erythropoietin release? decreased blood oxygen levels
During hemoglobin metabolism, what is the yellow pigmented substance produced by the removal of the iron group called? bilirubin
What is hematocrit measuring? Amount of erythrocytes (RBC's)
What is the function of spectrin? Shape and flexibility of RBC
Where are erythrocytes synthesized? bone marrow
What are three steps of homostasis? 1. vascular spasm 2. formation of platelet plug 3. plug coagulation
What does carbonic anhydrase transport? CO2
Name one function of the spleen? store RBC, remove old RBC, release bilirubin
What is produced as a result of hemoglobin catabolism and can under certain conditions of elevated plasma concentration cause a condition called jaundice? bilirubin
Each hemoglobin molecule can bind up to how many oxygen molecules? 4
Name on way to increase mean arterial pressure. increase cardiac output, increase total peripheral resistance
Blood vessels that bypass capillary beds are called _____________. meta-arterioles
What is myogenic response? inherent ability of smooth muscle to contact when stretched / or vasoconstriction to increase blood flow
During active and reactive hyperemia, what elements cause vasodilation? decreased oxygen and increased carbon dioxide
Which blood vessels have the greatest cross sectional areas but the lowest viscosity? capillaries
Name one factor influencing venous pressure and venous return (4 of them) -Skeletal muscle pump -blood pressure -respiratory pump -vena motor pump
Which ions channels are responsible for the plateau phase in the contractile cell action potential? (either ions or the name of both channels for extra credit) Ions: Calcium and Potassium Calcium L-type channel ???
Which two ions move through the funny channel? Sodium and Potassium
If the SA node fails, what other two locations in the heart can act as the pacemaker? Av Node and Purkinje fibers
Which side of the heart is the tricuspod valve located on? Is this an AV valve or a semilunar valve? Right, AV Valve
Created by: GracieLou