The "pump" or "pressure-head" for the pulmonary circulation is the: A. right atrium B. right ventricle C. left atrium D. left ventricle

From the right ventricle, blood flows directly into the_________. Select one: a. pulmonary arteries b. pulmonary veins c. aorta d. right atrium e. pulmonary trunk

The peripheral chemoreceptors that respond to oxygen levels of the blood and regulate heart activity are located in Select one: a. structures near the carotids and aortic arch. b. the infundibulum of the hypothalamus. c. the left ventricle. d. the right ventricle. e. the medulla oblongata.

An arrhythmia originating in pacemakers that shift back and forth between the SA node and an ectopic pacemaker in the atria or AV junction is called a(n):        
A. 
Multifocal atrial tachycardia        
B. 
Wandering atrial pacemaker        
C. 
Paroxysmal supraventricular tachycardia (PSVT)        
D. 
All of the above

Which cell types are associated with spontaneous action potential generation in the absence of an external stimulus from other tissues.   A. Sino-Atrial node cells (SA node).   B. Atrial cells   C. Ventricular cells.   D. Endothelial cells.   E. A and D.

Which of the following is the best description of what happens in capillaries? A. Capillaries are surrounded by thicker smooth muscle moving blood cells to exchange nutrients and oxygen. B. Capillaries connect minor veins to major veins returning blood to the heart. C. Capillaries are the location where oxygen, carbon dioxide, and nutrients are exchanged with tissues at the cellular level. D. Capillaries are the site where blood mixes with interstitial fluid to allow for gas and nutrient exchange.

The systemic circulation ends at the: A.right atrium B. right ventricle C. left atrium D. left ventricle The period of ejection: A. begins with the first heart sound and ends with the opening of the AV-valve. B. begins with the second heart sound and ends with the closing of the AV-valve. C. begins with the second heart sound and ends with the opening of the Aortic-valve. D. begins with the opening of the Aortic-valve and ends with the second heart sound. The arterial p02 is relatively low in an individual suffering from congestive heart failur because: A. hemoglobin is mis-shapen and can't bind adequate 02 B. pulmonary ventilation is compromised by the decrease in arterial pCO2 bronchoconstriction increases the total amount of air in the alveoli 02 has difficulty diffusing through the fluid trapped in the lung tissue he volume of blood ejected by the heart per minute is termed: stroke volume cardiac output end diastolic volume end systolic volume ght and Left Ventricular Pressures are…

Which of the following blood vessels supplies blood to the diaphragm? Select one: a. Intercostal artery b. Inferior mesenteric artery c. Superior phrenic artery d. Gastric artery e. Axillary artery