Chapter 20- Heart

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The heart beats approximately ________ times each day.

100,000

Which chamber receives oxygenated blood from the pulmonary circuit

16- Left Atrium

There are ________ pulmonary veins.

4

The following is a list of vessels and structures that are associated with the heart. 1. right atrium. 2. left atrium 3. right ventricle 4. left ventricle 5. venae cavae 6. aorta 7. pulmonary trunk 8. pulmonary veins

5, 1, 3, 7, 8, 2, 4, 6

Found in the interventricular Septum

AV Bundle

Point in the conduction system of the heart where the impulse is temporarily Delayed

AV Node

Intercalated discs serve to transfer ________ from cell to cell.

All of the answers are correct.

Prevents backflow into the left ventricle

Aortic semilunar valve

P

Atrium

The _____ cells of the heart do not maintain stable resting membrane potentials, therefore, they continually depolarize

Autorythmic

What volume is labeled G on the Graph

End Systolic Volume

The lining of the heart

Endocardium

Serous layer covering the heart muscle

Epicardium

A heart rate of less than 60 BPM is called tachycardia

False

Cardiac muscle has more mitochondria and depends less on a continual supply of O2 than does skeletal muscle

False

The aortic semilunar valve opens when pressure in the aorta is higher than the ventricular pressure

False

The mitral valve has chordae but the tricuspid valve does not

False

Tetanic muscle contractions don't occur in a normal cardiac muscle because

the refractory period lasts until the muscle relaxes.

what occurs at the area labeled D on the graph

A & C- AV Valve Opens, Diastolic refilling begins

Identify the structure labeled 6

Cusp of tricuspid valve

CO=

HR x SV

Identify the structure labeled 21

Ligamentum arteriosum

Prevents backflow into the left atrium

Mitral Valve

Heart Muscle

Myocardium

In the fetal heart there is a foramen ____ that allows blood to flow from the right atrium directly to the left atrium

Ovalis

Atrial Deplarization

P

Identify the structure labeled 8

Papillary muscles

The outermost layer of the serous pericardium

Parietal pericardium

What occurs at the cicled label 5 on the graph

Peak Systolic pressure

Network found in the ventricular myocardium

Purkinje Fibers

Point after which pressure begins to rise in the aorta

S

Intrinsic heart anatomy in order

SA NODE, AV NODE, AV BUNDLE, BUNDLE BRANCHES, PURKINJE FIBERS

the pacemaker of the heart

SA Node

What occurs at A on the graph

Semilunar valve opens

what volume is labeled E on the graph

Stroke Volume

Point of the least ventricular volume

T

Point that represents the Dup sound made by the heart

T

AV Valve with three flaps

Tricuspid Valve

Prevents backflow into the right atrium

Tricuspid Valve

Chronic release of excess thyroxine can cause a sustained increase in heart rate and a weakened heart

True

Congestive heart failure means that the pumping efficiency of the heart is depressed so that there is inadequate delivery of blood to body tissues.

True

In an ECG the electrical activity associated with atrial repolarization is usually obscured by the QRS complex

True

The atria receives blood returning to the heart

True

The heart lies anterior to the vertebral column and posterior to the sternum

True

The left side of the heart pumps the same volume of blood as the right

True

The myocardium receives its blood supply from the coronary arteries

True

Tissue damage by myocardial infarction is replaced by connective tissue

True

Trabeculae cornea are found in the ventricles and never the atria

True

T

Ventricle

QRS

Ventricular

The adult heart is roughly the size of

a man's clenched fist.

Which of the following descriptions matches the term near the left fifth intercostal space?

apex of heart

The earlike extension of the atrium is the

auricle.

AV valve with two flaps

bicuspid valve

The long plateau phase of the cardiac muscle action potential is due to

calcium channels remaining open.

The ________ deliver(s) blood to the myocardium.

coronary arteries

The great and middle cardiac veins drain blood into the

coronary sinus.

When a blood clot forms on a ruptured plaque in a coronary artery, the condition is referred to as a(n)

coronary thrombosis.

When the left ventricle contracts, the distance from the apex to the base

decreases.

Artery is to ________ as vein is to ________.

efferent; afferent

The visceral pericardium is the same as the

epicardium.

The atrioventricular valves permit blood flow

in one direction only.

In cardiac muscle, the fast depolarization phase of the action potential is the result of

increased membrane permeability to sodium ions.

The coronary sulcus is a groove that

marks the border between the atria and ventricles.

Excess fluid in the ________ causes cardiac tamponade.

pericardial cavity

Contractions of the papillary muscles

prevent the atrioventricular valves from reversing into the atria.

Identify the structure labeled 19

pulmonary semilunar valve

Prevents backflow into the right ventricle

pulmonary semilunar valve

The right ventricle pumps blood to the

right and left lungs.


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