Animals (2)- Human heart

Question 1

whats the sa node

Answer 1

pace maker, sends electrical signals to AV node

Question 2

whats the av node

Answer 2

receives signal from sa node
transmit signal to bundle of his ( specialized fibers)

Question 3

whats the purkinjea fibers

Answer 3

initiate contraction of left and right ventricle cells

Question 4

What creates the LUB in lub-dub

Answer 4

AV valve closes, blood travels from atria to ventricles

Question 5

what creates DUB in lub-dub

Answer 5

semi lunar valves closing, blood from ventricles to arteries

Question 6

what does the electrocardiogram do

Answer 6

record voltage changes produced by nerve signals

Question 7

whats the Pwave

Answer 7

begins when SA node fires and atria contracts

Question 8

whats the QRS complex

Answer 8

begins when AV node stimulates ventricles to contract AV valve (Lub)

Question 9

Whats the Twave

Answer 9

Ventricles relax and semi lunar valves close (dub)

Question 10

systole phase

Answer 10

ventricles contract- force blood out of pulmonary arteries and aorta. Systolic pressure can be calcuated

Question 11

Diastole phase

Answer 11

ventricles relax, pressure decrease in pulmonary arteries. Diastolic pressure can be calculated

Question 12

how is blood pressure measured

Answer 12

SPHYGMOMANOMETER

Question 13

whats the fromula for blood pressure

Answer 13

systolic pressure over diastolic pressure SP/DP. Average 120/80

Question 14

what is cardiac output

Answer 14

the volume of blood pumped out by the heart (ml/min). will tell us the 02 levels being del to body and total muscle performance

Question 15

whats HR

Answer 15

heart rate+ heart beats per minute

Question 16

whats SV

Answer 16

stroke volume+ amount of blood forced out by each heartbeat

Question 17

whats the cardiac output equation

Answer 17

CO= HR x SV