CH 17-19 TopHat
Blood is supplied to the myocardium by A the coronary arteries. B the coronary sinus. C arteries that branch from the pulmonary arteries. D contact with blood in the pumping chambers.
A
Considering the left ventricle, why does isovolumetric ventricular contraction occur during ventricular systole? A Aortic pressure is higher than ventricular pressure and the ventricle must pressurize the blood to open the aortic valve. B Ventricular pressure is greater than atrial pressure so the ventricle cannot eject blood. C Ventricular pressure is greater than atrial pressure so the ventricle cannot eject blood. D The ventricle is still filling with blood and therefore cannot eject blood during this time.
A
The following are structural components of the conducting system of the heart. 1. Purkinje fibers 2. AV bundle 3. AV node 4. SA node 5. bundle branches The sequence in which excitation would move through this system is A 4, 3, 2, 5, 1. B 1, 4, 3, 2, 5. C 4, 2, 3, 5, 1. D 3, 5, 4, 2, 1.
A
The layer of the arteriole wall that can produce vasoconstriction is the tunica A media B intima C externa D adventitia
A
White blood cells that release histamine at the site of an injury are A. basophils. B. neutrophils. C. eosinophils. D. lymphocytes.
A
A sample of tissue displays many large flattened spaces lined by fenestrated endothelium. Blood moves slowly through these spaces. This tissue sample most likely came from the A brain B small intestine C skin D spleen
B
The ________ lines the chambers of the heart, covers the heart valves, and is continuous with the endothelium. A. epicardium B. endocardium C. pericardium D. myocardium
B
Study action potential plots and ions
do it lol (pls)
The phase of hemostasis that involved clotting of blood is called A. diapedesis. B. hemolysis. C. coagulation. D. vascular spasm.
C
Which of the following statements is true regarding cardiac muscle? A Cardiac muscle preferentially metabolizes anaerobically. B There are specialized gap junctions in cardiac muscle not found in skeletal or smooth muscles. C Cardiac muscle goes into sustained contractions faster than skeletal muscle. D The actin and myosin myofilaments are not arranged in sarcomeres.
B
Blood returning to the heart from the pulmonary circuit first enters the A. right atrium. B. left ventricle. C. left atrium. D. right ventricle.
C
The force that moves fluid out of capillaries is ________ pressure whereas the opposing force that moves fluid into capillaries is ________ pressure. A colloid osmotic; hydrostatic B systolic; diastolic C hydrostatic; colloid osmotic D blood; interstitial
C
Type AB blood has which of the following characteristics? A. RBCs have the A antigen and the plasma has the anti-B antibody. B. RBCs have the A and the B surface antigens and the plasma has anti-A and anti-B antibodies. C. RBCs have both the A & B surface antigens and no ABO plasma antibodies. D. RBCs have no surface antigens and both anti-A and anti-B antibodies in the plasma.
C
During the T wave of the electrocardiogram, the ventricles are A contracting. B relaxing. C depolarizing. D both repolarizing and relaxing.
D
The phase in the cardiac cycle when the mitral valve is closed and the aortic valve is open is the A atrial systole. B dicrotic phase. C early diastolic filling phase. D ventricular ejection phase.
D
When a person who lives at sea level vacations in the Rocky Mountains, you would expect A)the release of erythropoietin. B) a rise in hematocrit. C can increase in red blood cell production. D All of the answers are correct.
D
