Help
Options
Question
The heart is actually (one, two, or three) pumps?
click to flip
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't know
Question
Which chamber receives blood from the superior and inferior vena cavae?
Remaining cards (77)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
heart questions
| Question | Answer |
|---|---|
| The heart is actually (one, two, or three) pumps? | two pumps |
| Which chamber receives blood from the superior and inferior vena cavae? | right atrium |
| Which heart chamber receives blood from the pulmonary veins? | left atrium |
| Which heart chamber pumps unoxygenated blood out the pulmonary trunk | right ventricle |
| Which chamber pumps oxygenated blood out the aorta to the systemic circuit? | left ventricle |
| Purkinje fibers | Convey(s) the impulse throughout the ventricular walls |
| AV node | Delay(s) occurs here while atria contract |
| Bundle branches: | Convey(s) the impulse down the interventricular septum |
| Internodal pathways: | Link(s) between the SA node and AV node |
| SA node | Set(s) the pace for the entire heart |
| AV bundle | Electrical link(s) between atria and ventricles |
| Which part of the intrinsic conduction system normally initiates the depolarizing impulse that causes a heartbeat? | SA node |
| Which of these structures conduct(s) action potentials the slowest? | AV node |
| Action potentials generated by the autorhythmic cells spread to the contractile cells through what structures in the membrane? | gap junctions |
| One of the changes that occurs in the pacemaker potential (unstable resting membrane potential) in the SA node (an autorhythmic cell) is a decreased efflux of what ion? | potassium |
| When threshold is reached at the SA node (an autorhythmic cell), what channels open causing further depolarization of the membrane? | fast calcium |
| Repolarization of an autorhythmic cell is due to the opening of which channels? | voltage-gated potassium channels |
| In order to cause cardiac muscle contraction, the contractile cells must also depolarize. What causes the depolarization of the contractile cells? | the flow of positive ions from adjacent cells |
| What does the ECG wave tracing represent? | electrical activity in the heart |
| What does the QRS complex represent in the ECG wave tracing? | ventricular depolarization |
| Contraction of the atria results from which wave of depolarization on the ECG tracing? | P wave |
| Which part of the intrinsic conduction system delays the impulse briefly before it moves on to the ventricles? | AV node |
| Isovolumetric relaxation and ventricular filling (two phases of the cardiac cycle) take place during __________. | ventricular diastole |
| the filling of the ventricles? | Most blood flows passively into the ventricles through open AV valves. |
| Describe the pressures in the atria and ventricles that would cause the opening of the AV valves. | Pressure in the atria would be greater than the pressure in the ventricles. |
| What causes the aortic semilunar valve to close? | greater pressure in the aorta than in the left ventricle |
| Put the phases of the cardiac cycle in the correct order, starting after ventricular filling. | isovolumetric contraction, ventricular ejection, isovolumetric relaxation |
| Increased pressure in the ventricles would close what valve(s)? | AV valves only |
| What is the relaxed state of the ventricle called? | diastole |
| the one-way nature of the left AV valve prevents blood flow from | the left ventricle to the left atrium |
| The closing of the left AV valve occurs near the beginning of | ventricular systole |
| The majority of ventricular filling occurs while the ventricles and atria are in what state(s)? | ventricular and atrial diastole |
| Which of the following most correctly describes end-diastolic volume? | the volume of the ventricle when it is most full |
| Left ventricular filling occurs ________ | while the AV valve is open |
| Heart valves are in what state during isovolumetric contraction? | The AV valves and semilunar valves are closed. |
| The decrease in left ventricular pressure at the end of ventricular systole causes __________. | the semilunar valve to close |
| Calculate the cardiac output if heart rate (HR) is 90 beats per minute, stroke volume (SV) is 110 ml/beat, end diastolic volume (EDV) is 140 ml, and end systolic volume (ESV) is 30 ml | 9.9 L/min |
| An increase in sympathetic stimulation of the heart would increase stroke volume by increasing __________. | contractility |
| End systolic volume (ESV) | the volume of blood in one ventricle after contraction |
| Heart rate (HR) | the number of heart beats per minute |
| Venous return (VR) | the volume of blood per minute flowing into one atrium |
| Cardiac output (CO) | the volume of blood per minute pumped out by one ventricle |
| End diastolic volume (EDV) | the volume of blood in one ventricle before contraction |
| Stroke volume (SV) | the volume of blood per heart beat pumped out by one ventricle |
| Which of the following would increase cardiac output to the greatest extent? | increased heart rate and increased stroke volume |
| Which of the following would increase heart rate? | epinephrine and norepinephrine |
| How would an increase in the sympathetic nervous system increase stroke volume? | increased contractility |
| By what mechanism would an increase in venous return increase stroke volume? | increased end diastolic volume |
| How would a decrease in blood volume affect both stroke volume and cardiac output? | decreased stroke volume and no change in cardiac output |
| Which part of the intrinsic conduction system normally initiates the depolarizing impulse that causes a heartbeat? | SA Node |
| Action potentials generated by the autorhythmic cells spread to the contractile cells through what structures in the membrane? | Gap junctions |
| In order to cause cardiac muscle contraction, the contractile cells must also depolarize. What causes the depolarization of the contractile cells? | the flow of positive ions from adjacent cells |
| When threshold is reached at the SA node (an autorhythmic cell), what channels open causing further depolarization of the membrane? | fast calcium |
| What do we call the amount of blood pumped out of each ventricle in one minute? | Cardiac output |
| The volume of blood pumped out from one ventricle with each beat is called __________. | Stroke volume |
| Increased parasympathetic stimulation has what effect on heart rate (HR)? | Decreased heart rate |
| During a 100-meter race, which of the following two mechanisms increase cardiac output? | increased sympathetic activity and increased preload |
| By what mechanism would an increase in venous return increase stroke volume? | Increased preload |
| Which network of blood vessels carries blood to and from the gas exchange surfaces in the lungs? | pulmonary circuit |
| Which vessels have very thin walls and are often called exchange vessels because they allow for the exchange of nutrients, gases, and wastes with surrounding tissues? | capillaries |
| Which layer of the heart wall is the visceral pericardium? | epicardium |
| Which chamber of the heart receives blood from the superior and inferior venae cavae? | right atrium |
| Which of the following contains the trabeculae carneae? | right ventricle |
| the left ventricle pumps blood into the | ascending aorta |
| Which valve is found between the right atrium and the right ventricle? | tricuspid |
| The right and left coronary arteries originate at the base of the __________. | ascending aorta |
| A large vein that opens into the right atrium and brings in venous blood from the heart tissue is the __________. | coronary sinus |
| Which of the following is called the cardiac pacemaker? | sinoatrial node |
| What structures in the conduction system conduct impulses very rapidly to the ventricular myocardium? | Purkinje fibers |
| The QRS complex on the ECG represents __________. | ventricular depolarization |
| The plateau in the action potential is caused by the entry of __________ ions. | calcium |
| What is the term for contraction of a heart chamber? | systole |
| Which of the following occurs during the first phase of ventricular systole? | The AV valves close, and ventricular pressure rises. |
| What produces the “lubb” of the first heart sound? | |
| Which of the following is measured in milliliters per beat? | stroke volume |
| What effect does epinephrine have on the SA node? | It increases heart rate. |
| Which of the following could increase the strength of the contraction of a ventricle? | increased stretch on the ventricle |
| Which of the following statements about autonomic tone is FALSE? | Sympathetic effects dominate in a resting healthy adult |
Created by:
Charon514