Quizlet CVS

SLCC Anatomy Ch 22- The Heart Study online at quizlet.com/_1a8368 1.

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Although the valve itself is located elsewhere, the best auscultation site for the left AV valve is near the ____ of the heart in the fifth intercostal space.

apex

As the ventricles start to contract, the first heart sound "lubb" signifies the closing of the

AV valves

Blood from the systemic circuit returns directly into which heart chamber?

right atrium

Blood from the systemic circuit returns to the right atrium through superior and inferior vena cava and the _______.

coronary sinus

The cardiac muscle fibers of the ____________ act as the pacemaker, the rhythmic center that initiates the heartbeat.

sinoartrial node

During late diastole, the atrioventricular valves open, and passive filling of the ventricle from the ____ begins and continues as most of the ventricular filling occurs.

atria

The epicardium is also called the _____ of the serous pericardium.

visceral layer

Externally, the atria and ventricles are separated by a relatively deep groove called the

coronary sulcus

From the right atrium, blood passes through the tricuspid valve into the

right ventricle

The inclusive period of time from the beginning of one heartbeat to the next is called

a cardiac cycle

Innervation of the heart consists of both sympathetic and parasympathetic innervation collectively called the ____ ___.

coronary plexus

Just before leaving the heart to go to the lungs, blood must pass through a smoothwalled region called the

conus arteriosus

The left and right bundles conduct the impulse from the AV bundle to conduction fibers called ____ cells.

Purkinje

The myocardium is composed of

cardiac muscle tissue

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Numerous _____ within the intercalated discs prevent cardiac muscles from pulling apart.

desmosomes

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Oxygenated blood flows through arteries and the _____ and ____ in the systemic circuit but through veins and the opposite heart chambers in the pulmonary circuit.

left atrium and ventricle

The pulmonary trunk carries blood from which heart chamber into the pulmonary circuit?

right ventricle

Regardless of the heart chamber, contraction is called ______ and relaxation, _______.

systole; diastole

The right coronary artery typically branches into which two vessels?

right marginal artery and posterior interventricular artery

The serous pericardium does not form a mucous membrane lining the

pericardial cavity

Specialized cardiac muscle fibers that transmit muscle impulses to the contractile muscle cells of the myocardium are an important part of the heart's

conduction system

Sympathetic and parasympathetic components of the autonomic nervous system that innervate the heart are collectively called the

coronary plexus

Sympathetic innervation of the heart begins at ____ segments of the spinal cord.

T1-T5

A type of heart murmur called mitral valve prolapse would most likely involve a defect in

the left chordae tendineae or papillary muscles

The ____ valve is forced open when the left ventricle begins to contract, preventing back flow into the left atrium.

bicuspid

What are the prominent ridges on the internal surfaces of the auricles and the anterior atrial walls?

pectinate muscles

What happens during ventricular diastole?

both ventricles fill with blood

What is the correct sequence of events in the beginning of the cardiac cycle?

atrial systole, atrial diastole, ventricular systole, ventricular diastole

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What would happen if the papillary muscles could not contract?

the atrioventricular valves would not seal tightly

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When a person's heart "skips a beat," what has most likely occurred?

premature ventricular contraction

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When closed, the bicuspid valve prevents backflow of blood into the

left atrium

Which structures prevent the AV valves from everting and flipping into the atria when the ventricles contract?

chordae tendineae and papillary muscles

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