BIOS 254 Chapter 15 Lecture HW

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BIOS 254 Chapter 15 Lecture HW

• In an ECG pattern, the T wave is caused by

–Answer repolarization of ventricular muscle fibers.

• The pulmonary circuit

–Answer sends deoxygenated blood to the lungs.

• Sudden cardiac arrest can result from

–Answer all of the above.

• An abnormally slow heart rate is termed

–Answer bradycardia.

• Which of the following is not a factor that increases risk of developing atherosclerosis?

–Answer Low blood pressure

• The correct sequence of parts that carry cardiac impulses is

–Answer SA node, AV node, AV bundle, Purkinje fibers

• Water and dissolved substances leave the arteriole end of a capillary due to , and enter

the venule end of a capillary due to .–Answer hydrostatic pressure being higher than osmotic pressure; osmotic pressure being higher than hydrostatic pressure

• The skeleton of the heart consists of

–Answer fibrous connective tissue encircling the atrioventricular orifices.

• Marjorie suffers from phlebitis. She has

–Answer 1 / 2

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inflammation of her veins.

• In an ECG pattern, the P wave is caused by

–Answer depolarization of atrial muscle fibers.

• The longest vein in the body is the

–Answer great saphenous vein.

• A left ventricular assist device

–Answer can maintain cardiac function until a donor heart becomes available.

• Impulses that the vagus nerve carries to the heart

–Answer are parasympathetic and decrease heart rate.

• Which artery is incorrectly matched to its location?

–Answer Thyrocervical arteries; thymus.

• The normal pacemaker of the heart is the

–Answer sinoatrial node.

• Which of the following gases does endothelium release?

–Answer Nitric oxide

• Which of the following is the correct sequence of parts through which blood moves from

the vena cava to the lungs?–Answer Right atrium, tricuspid valve, right ventricle, pulmonary valve

• Which of the following is due to an aging cardiovascular system?

–Answer The tunica interna thickens

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