KA6- The Structure And Function Of The Heart

Question 1

Structure and function of the heart

Answer 1

Blood flow through the heart and it’s associated blood vessels

Question 2

Cardiac output

Answer 2

The volume of blood pumped through each ventricle per minute
The left and right ventricles pump the same volume of blood through the aorta and pulmonary artery

Question 3

Atrial systole

Answer 3

Atria contract
Blood pushed to ventricles
AV open

Question 4

Ventricular systole

Answer 4

Ventricles contract
Blood pushed out of arteries
AV shut
SL open

Question 5

Diastole

Answer 5

Heart relaxes and fills with blood from the veins
SL closed
AV open

Question 6

Effect of pressure changes on valves

Answer 6

Opening and closing of the valves are responsible for the heart sounds heart with a stethoscope

Question 7

Electrocardiogram

Answer 7

Impulses in the heart generate currents that can be dected by this
Interpretations of electrocardiograms should involve calculation of heart rate and linking of the waves to atrial systole, ventricular systole and diastole

Question 8

Blood pressure changed in the aorta during cardiac cycle

Answer 8

Blood pressure increases during ventricular systole and decreases during diastole

Question 9

Measuring blood pressure using a sphygmomanometer

Answer 9

An inflatable cuff stops blood flow, on the artery, and deflates gradually. The blood starts to flow (detected by a pulse) at systolic pressure. The blood flows freely through the artery ( and a pulse is not detected) at diastolic pressure.

Question 10

Hypertension

Answer 10

High blood pressure
A major risk factor for many diseases including coronary heart disease