Chapter 20- Heart
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.
