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BME Exam 3
Terms in this set (36)
Identify the correct statement regarding leukocytes.
Leukocytes spend only a few hours in the bloodstream, then migrate through the walls of the capillaries.
Match each leukocyte disorder to its cause or definition.
Leukopenia:total WBC count below 5,000
Myeloid: incontrolled granulocyte production.
Lymphoid: uncontrolled lymphocyte/monocyte
Leukocytosis: WBC above 10,000
Acute Leukemia: suddenly,progressess rapidly
Chronic: develops more slowly
Which of the following correctly describe hemophilia? Check all that apply.
In the breakdown of hemoglobin, the globin chains __________.
are broken down by macrophages into amino acids
What are the two principal functions of erythrocytes?
To pick up oxygen from the lungs and deliver it to tissues and to pick up carbon dioxide from the tissues and unload it in the lungs
After tissue repair is completed, factor XII catalyzes the formation of a plasma enzyme called kallikrein, that in turn converts an inactive plasminogen into _________, a fibrin-dissolving enzyme that breaks up the clot.
The sa node __________ fires at regular intervals
this is because the cells of the sa node do not have a stable________
Their membrane potential starts at about
this gradual, upward drift towards a ____
this result from a slow inflow of sodium ions without a compensating outflow of ________
In the ventricles, the action potential travels along the interventricular septum to the apex of the heart, where it then spreads superiorly along the ventricle walls.
the semilunar valves remain open throughout the ____ phase of the cardiac cycle.
late ventricular systole
the atria remain in diastole throughout both the _______ phases of the cardiac cycle.
Ventricular systole and ventricular diastole
Positive inotropes allow the heart to pump____ blood with fewer heart beats. They do this by _______ the ebdsystolic volume (ESV)
An individual with high blood pressure (hypertension) is expected to benefit from the administration of ________ inotropic drugs that ________ the hearts workload.
The expected effect of the drug Digoxin is to ________ venbtricular contaction and ______ stroke volume.
During which phase of the cardiac cycle does aortic pressure reach its maximum?
During which complete phase of the cardiac cycle do both the atria and ventricles relax?
Isovolumetric - ventricles relax
Which of the following statements is not true regarding ventricular systole?
The ventricles relax.
Which of the following is caused by excitation of cardiac muscle?
The opening of voltage sensitive membrane calcium channels on the T tubules
An action potential in a cardiac muscle fiber is identical to an action potential in a skeletal muscle fiber.
The sum of the blood velocity of arterioles is equal to the blood velocity of the artery that feeds them.
How do materials get from the blood to the surrounding tissues?
Diffusion, filtration and absorption, and transcytosis
The blood flow to the body organs __________.
Is inversely proportional to the resistance of the arterioles leading to them
Blood pressure is directly proportional to vessel resistance.
What is the best way to estimate the MAP?
Take the diastolic pressure and add one-third of the pulse pressure.
Eventually, after the arteriole outflow has remained at an increased level, arterial pressure __________.
reaches a steady state
Which of the following contains chemoreceptors?
Inspiration begins as __________.
the diaphragm contracts
Which of the following statements about partial pressures of gases in the tissues is true?
Po2 in blood > Po2 in tissues; Pco2 in blood < Pco2 in tissues
Oxygen-rich blood is carried through pulmonary arteries from the lungs to the heart.
Oxygen-poor blood is carried through systemic veins from the body tissues back to the heart.
The partial pressure of oxygen usually has little effect on respiration.
Air consists of about 78.6% nitrogen, 20.9% oxygen, and 0.04% carbon dioxide. If we assume sea-level pressure of 760 mm Hg, what is the Po2?
159 mm Hg
As the lungs expand while breathing, the pressure in the lungs decreases.
THIS SET IS OFTEN IN FOLDERS WITH...
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