CV - Cardiac Cycle

Question 1

If the heart is relaxed how is it described

Answer 1

diastole

Question 2

isovolumetric contraction

Answer 2

early systole during which the ventricles contract with no corresponding volume change (isovolumetrically). This short-lasting portion of the cardiac cycle takes place while all heart valves are closed.

Question 3

Systole

Answer 3

Contraction of heart

Question 4

Average resting HR

Answer 4

~70 b/m

Question 5

Cardiac cycle - time

Answer 5

0.8sec

Question 6

Ventricular Systole =

Answer 6

0.3 sec

Question 7

Ventricular Diastole =

Answer 7

0.5 sec

Question 8

Atrial Systole =

Answer 8

0.1 sec

Only adds ~30% to vol of blood

Question 9

Atrial Diastole =

Answer 9

0.7 sec

Question 10

Cardiac output =

Answer 10

Heart Rate x Stroke Volume

Question 11

Cardiac Output can be altered by

Answer 11

Control of HR

Control of Stroke Volume

Question 12

Average cardiac output

Answer 12

~5 litres per min

Question 13

Blood is redistributed by

Answer 13

Vasodilation

Vasoconstriction

Question 14

Intrinsic factors

Answer 14

Local

Question 15

Extrinsic factors

Answer 15

ANS & hormones

Question 16

Blood pressure refers to

Answer 16

arterial blood pressure

Question 17

Blood flows within CVS as a result of

Answer 17

a pressure gradient

Question 18

Arterial BP is not constant. It is

Answer 18

pulsatile

Question 19

Systolic BP is when

Answer 19

the ventricles contract

Question 20

Diastolic BP is when

Answer 20

heart relaxed

Lowest BP achieved