Download Straighterline A&P II Quiz 2 46 Questions and Answers 2023.pdf and more Exams Nursing in PDF only on Docsity!
Straighterline A&P II Quiz 2 46
Questions and Answers 2023
What event(s) occur during the QRS complex of an ECG?
a. depolarization of the atria b. repolarization of the ventricles c. depolarization of the atria and repolarization of the ventricles d. depolarization of the ventricles and repolarization of the atria - ✔️ d. depolarization of the ventricles and repolarization of the atria
Blood in the pulmonary veins returns to the
a. right atrium. b. left atrium. c. right ventricle. d. left ventricle. e. coronary sinus. - ✔️ b. left atrium.
The "pacemaker" of the heart is the
a. right bundle branch. b. left bundle branch. c. AV node. d. SA node. e. PM node. - ✔️ d. SA node.
The great cardiac vein and middle cardiac vein empty into a venous cavity called the
a. pulmonary vein. b. inferior vena cava. c. superior vena cava. d. coronary sinus. e. coronary artery. - ✔️ d. coronary sinus.
Lowered extracellular potassium levels will lower the heart rate because
a. the resting membrane potential is hyperpolarized. b. ectopic action potentials occur. c. action potential amplitude declines. d. more sodium channels open. e. it blocks calcium channels. -
✔️ a. the resting membrane potential is hyperpolarized.
Which vessels empty blood into the left atrium?
a. aorta b. right atrium c. pulmonary trunk d. pulmonary arteries e. pulmonary veins - ✔️ e. pulmonary veins
The plateau phase seen during the action potential of a cardiac muscle cell is due to the
a. sodium-potassium pump. b. opening of sodium channels. c. continuing to have open calcium channels. d. closure of chloride channels. e. closing of calcium channels. - ✔️ c. continuing to have open calcium channels.
When a pacemaker potential in the SA node reaches threshold,
a. the permeability to K+ ions increases. b. many voltage-gated Ca2+ channels open. c. voltage-gated Ca2+ channels close. d. RMP has been restored. e. permeability of the cell does not change. - ✔️ b. many voltage-gated Ca2+ channels open.
The AV valve that is located on the same side of the heart as the origin of the aorta is the
a. bicuspid or mitral valve. b. tricuspid valve. c. aortic semilunar valve. d. pulmonary semilunar valve. e. coronary sinus valve. - ✔️ a. bicuspid or mitral valve.
Which of the following is NOT a major opening into the right atrium?
a. pulmonary vein b. inferior vena cava c. superior vena cava d. coronary sinus - ✔️ a. pulmonary vein
Which of the following might increase the risk for cardiovascular disease?
b. the two atria relax while the two ventricles contract. c. the left atrium contracts before the right atrium. d. all four chambers of the heart contract at the same time. e. all four chambers of the heart are in systole at the same time. - ✔️ b. the two atria relax while the two ventricles contract.
The procedure whereby a small balloon is placed into a partially occluded coronary artery and then inflated to increase blood flow through the artery is called a(n)
a. angioplasty. b. coronary bypass. c. urokinase injection. d. tissue plasminogen activation. e. angiogram. - ✔️ a. angioplasty.
An incompetent pulmonary semilunar valve could result in less blood reaching the
a. lungs. b. heart muscle. c. right ventricle. d. aorta. e. right atrium. - ✔️ a. lungs.
The chordae tendineae
a. connect the atria to the ventricles. b. are found in the interventricular septum. c. are part of the conducting system of the heart. d. connect the flaps of the AV valves to the papillary muscles. e. are a part of the myocardium. - ✔️ d. connect the flaps of the AV valves to the papillary muscles.
The pericardial sac is lined with
a. fibrous pericardium. b. parietal pericardium. c. visceral pericardium. d. myocardium. e. epicardium. - ✔️ b. parietal pericardium.
Which of the following is NOT true about the heart?
a. The heart is about the size of a closed fist. b. The heart is located in the mediastinum. c. The apex of the heart is directed superiorly and to the left. d. Knowing the heart's position is important for effective CPR. -
✔️ c. The apex of the heart is directed superiorly and to the left.
Which of the following is a function of the heart skeleton?
a. Provides electrical insulation between the atria and ventricles. b. Supplies support and reinforcement for the valves. c. Provides a rigid site for cardiac muscle attachment. d. All of the choices are functions of the heart skeleton. - ✔️ d. All of the choices are functions of the heart skeleton.
Concerning heart sounds, which of the following is correct?
a. The first heart sound occurs at the beginning of ventricular systole. b. The second heart sound is heard when the AV valves are closing. c. The first heart sound is the sound of the semilunar valves closing. d. The second heart sound occurs when blood flows into the superior vena cava. e. The first heart sound occurs at the beginning of ventricular diastole. - ✔️ a. The first heart sound occurs at the beginning of ventricular systole.
The right side of the heart receives blood from the body and pumps through _________ circulation to the lungs.
a. hepatic b. pulmonary c. peripheral d. systemic - ✔️ b. pulmonary
Excess potassium ions in cardiac tissue cause
a. an increased heart rate. b. a rapid repolarization of cardiac cells. c. a decrease in the frequency of action potentials in the conduction system. d. an increase in stroke volume. e. an increase in the frequency of action potentials. - ✔️ c. a decrease in the frequency of action potentials in the conduction system.
During the isovolumetric contraction period of the cardiac cycle,
a. AV and semilunar valves are closed. b. the atria are contracted. c. ventricular volume increases. d. blood is pumped into the large arteries. e. pressure in the ventricles decreases. - ✔️ a. AV and semilunar valves are closed.
If the heart receives more sympathetic stimulation than parasympathetic stimulation, the heart will
b. ventricular tachycardia. c. SA node block. d. paroxysmal atrial tachycardia - ✔️ a. sinus arrhythmia.
A patient has been diagnosed with mild heart disease. Tests show that some of the coronary arteries are partially occluded. Which of the following is the best course of action to treat the disease?
a. Angioplasty b. Coronary bypass surgery c. Electrocardiogram d. Tissue plasminogen activation e. Angiogram - ✔️ a. Angioplasty
Why is it important to use an antibiotic other than ampicillin in the treatment of bacterial pneumonia?
a. Because antibiotics, such as ampicillin destroy the cell walls of cardiac muscle cells. b. Because antibiotics, such as ampicillin cause the cells lining blood vessels to endocytose bacteria and deposit them in cardiac muscle tissue. c. Because antibiotics, such as ampicillin are not effective in the treatment of bacterial pneumonia. d. Because antibiotics, such as ampicillin destroy the cell walls of bacteria which cause a toxin to be released that will destroy cardiac muscle cells. - ✔️ d. Because antibiotics, such as ampicillin destroy the cell walls of bacteria which cause a toxin to be released that will destroy cardiac muscle cells.
Which of the following is administered to the people suffering from myocardial infarction following onset of symptoms?
a. Beta-adrenergic blocking agents b. Nitroglycerine c. Tissue plasminogen activator (t-PA) d. Digitalis - ✔️ c. Tissue plasminogen activator (t-PA)
If the SA node is nonfunctional, which of the following is most likely to occur?
a. The heart will go into asystole (stop). b. Tachycardia will develop. c. Another portion of the heart will become the pacemaker. d. The heart will go into defibrillation. e. The heart will be desensitized. - ✔️ c. Another portion of the heart will become the pacemaker.
Another name for the visceral pericardium is the
a. endocardium. b. epicardium. c. isocardium. d. myocardium. e. visocardium. - ✔️ b. epicardium.
The right atrium receives blood from
a. the lungs and the heart. b. the heart. c. the body and the heart. d. the lungs and the body. - ✔️ c. the body and the heart.
All of the following are functions of the heart, except _____________________.
a. generating blood pressure b. separating pulmonary and systemic circulations c. moving blood in one direction d. adjusting blood supply, depending on tissue needs e. adjusting blood gas levels, depending on tissue needs - ✔️ e. adjusting blood gas levels, depending on tissue needs
Which of the following events occurs first?
a. threshold b. depolarization c. early repolarization d. final repolarization e. pacemaker potential - ✔️ e. pacemaker potential
An increase in extracellular calcium generally increases
a. the heart rate. b. the force of contraction. c. autonomic stimulation of the heart. d. sodium channel opening. e. the frequency of the action potentials. - ✔️ b. the force of contraction.
The adult heart averages ___________ grams.
a. 100- 200 b. 50- 100 c. 250- 300 d. 400- 500 -
