A&P Chapter 11.2 Regulation of the Heart

An irregular heartbeat or rhythm

• Irregularia
• Dysrhythmia
• Anomalia
• Arrhythmia

A condition in which the atria contract in an uncoordinated, rapid manner (rate above 350 rpm), causing the ventricles to contract irregularly

• Ventricular fibrillation
• Atrial flutter
• Atrial tachycardia
• Atrial fibrillation

a small mass of tissue that transmits impulses received from the sinoatrial node to the ventricles via the bundle of His

• Sinoatrial node
• Atrioventricular node (AV node)
• Atrioventricular bundle
• Purkinje fibers

Pressure-sensitive nerve endings in the atrium, aortic arch and carotid arteries

• Thermoreceptors
• Mechanoreceptors
• Chemoreceptors
• Baroreceptors

A normal heart rhythm but with a rate below 60 bpm; a condition common among athletes

• Tachycardia
• Hypertension
• Arrhythmia
• Bradycardia

A slender bundle of modified cardiac muscle that conducts electrical impulses from the AV node to the left and right bundle branches to Purkinje fibers in the ventricle

• Bundle of Hers
• Bundle of Its
• Bundle of Threes
• Bundle of His

To contract; the atria and ventricles do this as the heart beats

• Depolarize

• Expand
• Constrict
• Diastole

Tags

NGSS.MS-LS1-3

A condition in which the impulses traveling from the SA node to the ventricles are delayed, intermittently blocked, or completely by the AV node

• SA node dysfunction
• Ventricular block
• Heart delay
• Heart block

The left limbs or branches through which electrical impulses are transmitted from the bundle of His through the left ventricle.

• Left bundle branches

• Cardiac myocytes
• Bundle of His fibers
• Purkinje fibers

The condition in which an irritable piece of atrial heart tissue fires before the SA node, causing the atria to contract too soon.

• Premature atrial contraction (PAC)
• Sinus bradycardia
• Ventricular tachycardia
• Atrial fibrillation