A&P2 Heart- Ch20

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A heartbeat lasts

370 msec.

The left ventricle pumps blood to the

aorta

Most of the middle layer in the heart wall is composed of

cardiac myocytes

Contractions of the papillary muscles

prevent the atrioventricular valves from reversing into the atria

The first blood vessels to branch from the aorta are the ________ arteries.

coronary

The marginal branch and posterior interventricular branch are branches of the

right coronary artery

The cusps (leaflets) of atrioventricular valves attach directly to

chordae tendineae.

Blood flowing into the heart from the venae cavae flows next through the ________ valve.

tricuspid

In the middle of the thoracic cavity is a region occupied by the heart, great vessels, thymus, esophagus, and trachea called the

mediastinum.

Blood returning to the heart from the pulmonary circuit first enters the

left atrium.

The right ventricle pumps blood to the

right and left lungs.

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

decreases.

The bicuspid or mitral valve is located

between the left atrium and left ventricle.

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

calcium channels remaining open.

The heart is innervated by ________ nerves.

both parasympathetic and sympathetic

The coronary sulcus is a groove that

marks the border between the atria and ventricles.

Contractions of the papillary muscles

prevent the atrioventricular valves from reversing into the atria

The visceral pericardium is the same as the

epicardium.

As blood leaves the right ventricle it passes through the ________ and then into the pulmonary trunk.

conus arteriosus

The first blood vessels to branch from the aorta are the ________ arteries.

coronary

The normal pacemaker of the heart is located in the

sinoatrial node.

The following are structural components of the conducting system of the heart.

1. Purkinje fibers
2. AV bundle
3. AV node
4. SA node
5. bundle branches

The sequence in which excitation would move through this system is

4, 3, 2, 5, 1.

The P wave of the electrocardiogram is a signal from

depolarization of the atria.

Depolarization of the ventricles is represented on an electrocardiogram by the

QRS complex

The volume of blood ejected from each ventricle during a contraction is called the

stroke volume

Drugs that block the beta-one adrenergic receptors will

decrease heart rate

The heart is roughly the size of

a man's clenched fist.

________ is to slow heart rate as ________ is to fast heart rate.

Bradycardia; tachycardia

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