問題一覧
1
Which of the following is not part of the cardiovascular system?
Lung
2
What Is the Function of the Pulmonary Circuit?
Sends oxygen-poor blood to the lungs
3
The Outermost Membrane That Forms a Loose-Fitting Sac Around the Heart Is the __________.
fibrous pericardium
4
Which of the Following Represents the Correct Sequence of Structures Through Which Blood Moves From the Venae Cavae to the Lungs?
Right atrium, tricuspid valve, right ventricle, pulmonary valve
5
What Happens to the Valves When the Ventricular Walls Relax?
Bicuspid and tricuspid valves open.
6
Which of the Following Structures Does Not Require Stimulation From Nerve Fibers or Other Agents?
Sinoatrial node
7
What Is the Correct Sequence of Structures of the Cardiac Conduction System?
SA node, AV node, AV bundle, Purkinje fibers
8
In an ECG Pattern, What Event Is Represented by the P Wave?
Depolarization of atrial muscle fibers
9
In an ECG Pattern, What Event Is Represented by the T Wave?
Repolarization of ventricular muscle fibers
10
Impulses Carried to the Heart by Means of Fibers That Secrete Acetylcholine Are __________ Impulses and Cause the Heart Rate to __________.
parasympathetic; decrease
11
Which Type of Blood Vessel Serves as a Blood Reservoir?
Veins
12
The Density of Capillaries Within a Tissue Is Proportional to the Tissue's __________.
rate of metabolism
13
What Is the Function of Plasma Proteins in Capillary Exchange?
To maintain the osmotic pressure of the blood
14
During What Phase of the Cardiac Cycle Is Blood Pressure in the Systemic Arteries the Greatest?
During ventricular systole
15
What Does the Frank-Starling Law of the Heart State?
The greater the length of myocardial fibers, the greater the force with which they contract
16
In Normal Circulation, Blood Flow Usually Follows What Pattern of Vessels?
Artery, arteriole, capillary, venule, vein
17
The _______ Circuit Sends Oxygen-Rich Blood From the Heart to All Cells of the Body, Removes Carbon Dioxide and Other Wastes, and Returns Blood to the Heart.
systemic
18
What Is the Complete Set of Contraction and Relaxation Events That Constitutes One Heartbeat Called?
Cardiac cycle
19
What Part of the ECG Pattern Is Due to Depolarization of the Ventricles?
QRS complex
20
A Resting Heart Rate That Exceeds 100 Beats per Minute Is Called __________.
tachycardia
21
An Abnormally Slow Heart Rate (Fewer Than 60 Beats per Minute) Is Called _______________.
Bradycardia
22
In What Type of Blood Vessel Is the Tunica Media the Thickest?
Arteries
23
Which Blood Vessel Type Has the Lowest Blood Pressure?
Veins
24
The Volume of Blood Discharged From the Ventricle With Each Heartbeat Is Called _________.
stroke volume
25
How Does Heart Rate Affect Blood Pressure?
Elevated heart rate increases cardiac output, therefore raising blood pressure.
26
If the Aortic Baroreceptor Senses an Increased Stretch of the Aorta, How Will the Nervous System Respond?
Parasympathetic signals will be sent to decrease heart rate.
27
During Long Flights, It Is Recommended That You Move Your Foot up and Down Periodically, Forcing Contractions of the Muscles in the Calf. How Would This Help With Circulation?
Contraction of the leg muscles squeezes leg veins, which function as a pumping mechanism to return deoxygenated blood to the heart.
28
Drinking Too Much Water Would __________ Blood Viscosity and Subsequently __________ Peripheral Resistance.
decrease; decrease
29
Which of the Following Would Cause a Decrease in Cardiac Output?
An increase in parasympathetic stimulation
30
Which of the Events Below Would NOT Increase the Pressure of Blood Against the Blood-Vessel Walls?
A decrease in blood viscosity