CH 11 Physiology M/C

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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


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