Exam 2 - Quizes
Q5:Which of the following is a positive inotrope? A) Na+ B) K+ C) Ca2+ D) both Na+ and K+
C
4. The pleura that surrounds the lungs consists of two layers, the ________. a. visceral and parietal pleurae. b. mediastinum and parietal pleurae. c. visceral and mediastinum pleurae. d. none of the above
A
Q4:What happens to preload when there is venous constriction in the veins? A) It increases. B) It decreases. C) It remains constant. D) There is no way to predict.
A
Q8:Purkinje fibers ____. A) complete conduction pathway into apex and ventricular walls. B) are contractile cells. C) innervates SA and AV nodes, and heart muscle. D) cause dicrotic notch as brief rise in aortic pressure.
A
Q3:The force the heart must overcome to pump blood is known as ________. A) Preload B) afterload C) cardiac output D) stroke volume E) Heart rate
B
Q5:Most blood enters the ventricle during ________. A) atrial systole B) atrial diastole C) ventricular systole D) isovolumic contraction
B
The partial pressure of carbon dioxide is 45 mm Hg in the blood and 40 mm Hg in the alveoli. What happens to the carbon dioxide? a. It diffuses into the blood. b. It diffuses into the alveoli. c. The gradient is too small for carbon dioxide to diffuse. d. It decomposes into carbon and oxygen. e. none of the above
B
Which of the following occurs during the chloride shift? a. Chloride is removed from the erythrocyte. b. Chloride is exchanged for bicarbonate. c. Bicarbonate is removed from the erythrocyte. d. Bicarbonate is removed from the blood.
B
1. Which of the following anatomical structures is not part of the conducting zone? a. pharynx b. nasal cavity c. alveoli d. bronchi e. all are conductive.
C
3. What is the role of alveolar macrophages? a. to secrete pulmonary surfactant b. to secrete antimicrobial proteins c. to remove pathogens and debris d. to facilitate gas exchange e. forms a pore to other alveoli equalizing pressure.
C
Oxyhemoglobin forms by a chemical reaction between which of the following? a. hemoglobin and carbon dioxide b. carbonic anhydrase and carbon dioxide c. hemoglobin and oxygen d. carbonic anhydrase and oxygen
C
Q1:The first heart sound represents which portion of the cardiac cycle? A) atrial systole B) ventricular systole C) closing of the atrioventricular valves D) closing of the semilunar valves E) None of above
C
Q1:Which of the following is unique to cardiac muscle cells? A) Only cardiac muscle contains a sarco-plasmicreticulum. B) Only cardiac muscle has gap junctions. C) Only cardiac muscle is capable of autorhythmicity D) Only cardiac muscle has a high concentration of mitochondria.
C
Q7:Normal SA node pacemaker generates impulses that are _____________. A) about 50 times/minute B) about 30 times/minute C) about 75 times/minute D) slower than AV node.
C
2. Which of the following are structural features of the trachea? a. C-shaped cartilage b. smooth muscle fibers c. cilia d. all of the above e. none of the above.
D
5. Contraction of the external intercostal muscles causes which of the following to occur? a. The diaphragm moves downward. b. The rib cage is compressed. c. The thoracic cavity volume decreases. d. The ribs and sternum move upward. e. Alveoli get compressed.
D
Q2: The influx of which ion accounts for the plateau phase? A) Sodium B) potassium C) chloride D) calcium E) All of above
D
Q2:Which portion of the ECG corresponds to repolarization of the atria? A) P wave B) QRS complex C) T wave D) none of the above: masked by ventricular depolarization
D
Q3:Which component of the heart conduction system would have the slowest rate of firing? A) atrio-ventricular node B) atrioventricular bundle C) bundle branches D) Purkinje fibers
D
Q4:Term typically used to refer to ventricular contraction while no blood is being ejected? A) Systole B) diastole C) quiescent D) isovolumic contraction
D
Q6:Cardiac conductive cells have unstable resting potentials due to _________. A) Ca2+ channels B) their small numbers (1%) of cardiac cells. C) heart block . D) the continuously opened slow Na+ channels
D
Which of the following factors play a role in the oxygen-hemoglobin saturation/dissociation curve? a. temperature b. pH c. BPG d. all of the above
D
Which of the following stimulates the production of erythrocytes? a. AMS b. high blood levels of carbon dioxide c. low atmospheric pressure d. erythropoietin e. none of the above.
D
