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1. The P wave of a normal electrocardiogram indicates A)

Resolved Question:

1. The P wave of a normal electrocardiogram indicates:
A) atrial repolarization
B) ventricular repolarization
C) ventricular depolarization
D) all of the above
E) none of the above
2. Blood transports dissolved gases, bringing oxygen from the lungs to the tissues and carrying:
A) carbon dioxide from the lungs to the tissues
B) carbon dioxide from one peripheral cell to another
C) carbon dioxide from the interstitial fluid to the cell
D) carbon dioxide from the tissues to the lungs
E) none of the above
3. Atrial natriuretic peptide (ANP) reduces blood volume and pressure by:
A) blocking release of ADH
B) stimulating peripheral vasodilation
C) increased water loss by kidneys
D) all the above
E) none of the above
4. One of the major characteristics of the arteries supplying peripheral tissues is that they are:
A) elastic
B) muscular
C) rigid
D) all of the above
E) none of the above
5. The "specialized" arteries that are able to tolerate the pressure shock produced each time ventricular systole occurs and blood leaves the heart are:
A) muscular arteries
B) elastic arteries
C) arterioles
D) fenestrated arteries
E) none of the above
6. The only blood vessels whose walls permit exchange between the blood and the surrounding interstitial fluids are:
A) arterioles
B) venules
C) capillaries
D) all of the above
E) none of the above
7. Blood from systemic circulation is returned to the right atrium by the superior and:
A) inferior vena cava
B) pulmonary veins
C) pulmonary arteries
D) brachiocephalic veins
E) none of the above
8. The process that halts bleeding is called:
A) hemostasis
B) hematocrit
C) hemangioma
D) lymphopoiesis
E) none of the above
9. The large blood vessel that collects most of the venous blood from organs below the diaphragm is the:
A) superior vena cava
B) inferior vena cava
C) hepatic portal vein
D) superior mesenteric vein
E) none of the above
10. The sinoatrial node acts as the pacemaker of the heart because these cells are:
A) located in the wall of the left atrium
B) the only cells in the heart that can conduct an impulse
C) the only cells in the heart innervated by the autonomic nervous system
D) the ones that depolarize and reach threshold first
E) none of the above
11. Blood temperature is roughly ______, and the blood pH averages ______.
A) 0 degrees C; 6.8
B) 32 degrees C; 7.0
C) 38 degrees C; 7.4
D) 98 degrees C; 7.8
E) none of the above
12. Atrioventricular valves prevent backflow of blood into the _______; semilunar valves prevent backflow into the:
A) atria; ventricles
B) lungs; systemic circulation
C) ventricles; atria
D) capillaries; lungs
E) none of the above
13. A person with type O blood contains:
A) anti-A and anti-B agglutinins
B) anti-O agglutinins
C) anti-A and anti-B agglutinogens
D) Type O blood lacks agglutinins.
E) none of the above
14. The primary function of a mature red blood cell is:
A) transport of respiratory gases
B) delivery of enzymes to target tissues
C) defense against toxins and pathogens
D) all of the above
E) none of the above
15. The visceral pericardium, or epicardium, covers the:
A) inner surface of the heart
B) outer surface of the heart
C) vessels in the mediastinum
D) endothelial lining of the heart
E) none of the above
16. The QRS complex of the EKG appears as the:
A) atria depolarize
B) atria repolarize
C) ventricles repolarize
D) ventricles depolarize
E) none of the above
17. Erythropoietin appears in the plasma when peripheral tissues, especially the kidneys, are exposed to:
A) extremes of temperature
B) high urine volumes
C) excessive amounts of radiation
D) low oxygen concentrations
E) none of the above
18. Formation of lipid deposits in the tunica media associated with endothelial damage is called ____.
A) cardiac arrest
B) atherosclerosis
C) thrombosis
D) all of the above
E) none of the above
19. In addition to water and proteins, the plasma consists of:
A) erythrocytes, leukocytes, and platelets
B) electrolytes, nutrients, and organic wastes
C) albumins, globulins, and fibrinogen
D) all of the above
E) none of the above
20. Formed elements in the blood are produced through the process of:
A) hemolysis
B) hemopoiesis
C) diapedesis
D) erythrocytosis
E) none of the above
21. The most important determinant of peripheral resistance is:
A) a combination of neural and hormonal mechanisms
B) differences in the length of the blood vessels
C) friction between the blood and the vessel walls
D) the diameter of the arterioles
E) none of the above
22. Left and right bundle branches pass their signals to:
A) the bundle of his
B) Purkinje fibers
C) the AV node
D) the SA node
E) none of the above
23. The first stage of the cardiac cycle is
A) atrial systole
B) atrial diastole
C) ventricular systole
D) ventricular diastole
E) none of the above
24. Circulating mature RBCs lack:
A) mitochondria
B) ribosomes
C) nuclei
D) all
Submitted: 6 years ago.
Category: Homework
Expert:  SmartTutor replied 6 years ago.

SmartTutor :

1. A) atrial repolarization 2. D) carbon dioxide from the tissues to the lungs; 3. D) all the above; 4. B) muscular; 5. B) elastic arteries; 6. E) none of the above; 7. A) inferior vena cava; 8. A) hemostasis; 9.B) inferior vena cava; 10. D) the ones that depolarize and reach threshold first; 11. C) 38 degrees C; 7.4; 12. A) atria; ventricle; 13. A) anti-A and anti-B agglutinins; 14. A) transport of respiratory gases; 15. B) outer surface of the heart; 16. D) ventricles depolarize; 17. D) low oxygen concentrations; 18. B) atherosclerosis; 19. B) electrolytes, nutrients, and organic wastes; 20. B) hemopoiesis; 21. C) friction between the blood and the vessel walls; 22. B) Purkinje fibers; 23. A) atrial systole; 24. D) all

SmartTutor :

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