9.2 Heart

Question 1

identify all parts of heart

Question 2

what are coronary arteries

Answer 2

coronary arteries supply blood to the heart muscle

Question 3

explain the difference in thickness of muscular wall of atriums and ventricles

Answer 3

ventricles have thicker muscular walls then the atrium because they pump blood out of the body and need to do it at a higher pressure

Question 4

explain the difference in thickness of muscular wall of atriums and ventricles

Answer 4

left ventricle’s muscular wall is thicker than the right ventricle’s muscular wall because it has to pump blood at a higher pressure to the whole body whereas the right ventricle has to pump blood just to the lungs

Question 5

how to monitor activity of the heart

Answer 5

• ecg
• pulse rate
• listening to sounds of valves closing with stethoscopes

Question 6

describe procedure of investigation of physical activity on the heart rate

Answer 6

1. record the pulse rate and breathing rate for 1 minute
2. exercise for a while
3. record the pulse rate and breathing rate every minute until it returns to the resting pulse and breathing rate
4. this experiment will show that during exercise, the heart rate increases and may take several minutes to return to normal

Question 7

explain the effect of physical activity on the heart rate

Answer 7

-during exercise, the muscle cells of the body need more energy
-therefore they need more oxygen and glucose for respiration
-the waste products of respiration also need to be removed faster from cells
-moreover some of the muscle cells may have respired anaerobically without oxygen so the oxygen debt needs to be repaid
-the heart rate therefore increases to meet these demands

Question 8

what is coronary heart disease

Answer 8

when the coronary artery becomes blocked, leading to the blood and oxygen starvation in the heart muscles. this leads to a heart attack

Question 9

what causes coronary heart disease

Answer 9

the buildup of cholesterol and other fatty substances within the coronary arteries

Question 10

what are the possible risk factors for coronary heart disease

Answer 10

-diet
-lack of exercise
-stress
-smoking
-genetic predisposition
-age
-gender

Question 11

how to reduce risk of coronary heart disease

Answer 11

-quit smoking
-maintain a healthy diet with reduced animals fats
-exercise regularly

Question 12

what is coronary heart disease

Answer 12

when the coronary artery becomes blocked leading to blood and oxygen starvation in the heart muscles. this leads to a heart attack

Question 13

cause of chd

Answer 13

the buildup of cholesterol and other fatty substances within the coronary arteries

Question 14

possible risk factors of chd

Answer 14

-diet
-lack of exercise
-stress
-smoking
-genetic predisposition
-age
-gender

Question 15

how to reduce risk of chd

Answer 15

-quit smoking
-maintain a healthy diet with reduced animal fats
-exercise regularly