CH 11 Physiology M/C
The length of the cardiac cycle is normally ________ second(s) in length.
0.8
A person with a heart rate of 75 beats per minute and a stroke volume of 60 mL per beat has a cardiac output of ________.
4500 mL/minute
The average heart beats about ________ times per minute.
75
Which of the following is a risk factor for developing essential hypertension?
All of the listed responses are risk factors for developing essential hypertension.
The electrocardiogram (ECG) wave that results from the firing of the sinoatrial (SA) node is the ________ wave.
P
What information can a clinician obtain from an electrocardiogram (ECG)?
abnormality in electrical activity of heart
Which of the following hormones promotes sodium ion reabsorption by the kidney in order to increase blood pressure and blood volume?
aldosterone
The first heart sound, "lub," is caused by the closure of the ________ valves.
atrioventricular (AV)
What part of the heart's intrinsic conduction system carries impulses into the interventricular septum?
atrioventricular (AV) bundle
Where does the sinoatrial node send an impulse after it initiates the electrical signal?
atrioventricular (AV) node
Fluid tends to be forced out of a capillary bed by ________ while ________ tends to draw fluid into the capillary bed.
blood pressure; osmotic pressure
The heart sounds "lub" and "dup" result from ________.
closure of heart valves
What blood vessel do you palpate when checking the pulse in your neck?
common carotid artery
When ventricles ________, the AV valves are closed.
contract
Which of the following will reduce blood pressure?
decreasing peripheral resistance
Which of the following is NOT a method or pathway of movement for substances traveling across a capillary wall?
desmosomes
By what pathway does oxygen leave capillaries to supply body tissues?
diffusion through capillary cell membranes
Which of the following increases heart rate?
epinephrine
What is a possible complication to arteriosclerosis?
heart attack
Which of these events is NOT associated with ventricular systole?
heart is relaxed
Sustained elevated arterial blood pressure above 140/90 mm Hg is a condition known as ________.
hypertension (high blood pressure)
The partition where the bundle branches are located is called the ________.
interventricular septum
Where is the radial artery located?
lateral forearm
The sinoatrial node, located in the right atrium of the heart, is often called the ________.
pacemaker
The alternating expansion and recoil of an artery that occurs with each beat of the left ventricle creates a pressure wave known as a(n) ________.
pulse
Which one of the following areas is NOT a pressure point?
renal artery
The sinoatrial node is located in the ________.
right atrium
You notice a missing P wave on a patient's electrocardiogram (ECG) and believe there is a problem with the ________.
sinoatrial (SA) node
Which one of the following represents the correct path for the transmission of an impulse in the intrinsic conduction system of the heart?
sinoatrial (SA) node, atrioventricular (AV) node, atrioventricular (AV) bundle (bundle of His), right and left bundle branches, Purkinje fibers
Which of these describes a fenestrated capillary?
special capillary type with small pores found in tissue where absorption is important
Which of these will decrease heart rate?
stimulation by vagus nerve
The volume of blood pumped out by each ventricle with each beat of the heart is called the ________.
stoke volume
The volume of blood pumped out of a ventricle with each heartbeat is known as ________.
stroke volume (SV)
What term refers to the contraction of the heart?
systole
Coronary artery disease results from ________.
the accumulation of fatty substances within blood vessels
Which of the following will slow the heart rate?
vagus nerve stimulation
The narrowing of blood vessels is known as ________.
vasoconstriction
Which of these will increase arterial blood pressure (BP)?
vasoconstriction of arteries
Which of the following vessels has the lowest blood pressure?
venae cavae
During mid-to-late diastole, blood flows from the atria to the ________.
ventricles