ch21 pathology of the heart (lesson 4)

Question 1

t/f each side of the heart pumps the same amount of blood at the same time

Answer 1

t!

Question 2

transmission of an electrical impulse

Answer 2

1. SA node fires
2. excitation spreads through atrial myocardium
3. AV node fires
4. excitation spreads down AV bundle
5. purkinje fibres distribute exciation through ventricular myocardium

Question 3

how many body locations/leads does an ECG record

Answer 3

12

Question 4

what do ECG patterns reflect?

Answer 4

depolarization and repolarization of cardiac tissue

Question 5

CHF

and treatment

Answer 5

chronic heart failure

decreased contractile ability

heart gets bigger due to more blood in chambers

diuretics, vasodilators, BB

Question 6

CAD

Answer 6

coronary artery disease

insufficient flow of blood through the coronary arteries

Question 7

MI

treatment

Answer 7

myocardial infarction

when areas of cardiac muscle are deprived of blood flow

can be caused by a blood clot

treatment - anticoagulants

Question 8

cardiac nerve supply

Answer 8

provided by both divisions of the ANS

symp - NE at adrenergic nerve endings + f/f

parasymp - AC at cholinergic nerve endings + restoration