heart questions Word Scramble

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

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