Ingliz tili o’zbekiston Respublikasi Sog’liqni saqlash vazirligi tomondan tibbiyot oliy o’quv yurtlari talabalari uchun qo’lanma sifatida tavsiya etilgan. "O’zbekiston milliy ensiklopediyasi"

Qiziqarli faktalrni o’qing va eslab qoling:

Do you know that …

1. 
   …. each erythrocyte lives 120-130 days? 2. … each leucocyte lives 4-7 days? 3. … every day 200.000.000 erythrocytes are born and the same number dies?
   

HOME ASSIGNMENTS

7. 
   Translate the following indefinite personal sentences:
   

1. 
   It is known that blood becomes oxygenated in the lungs. 2. They say that patient Smimov’s health will be restored soon. 3. One knows that pulse rate becomes rapid on physical exertion. 4. It is estimated that his body weigh considerably decreased during the prolonged illness.
   

8. 
   Answer the following questions:
   

1. 
   How many days does each erythrocyte live? 2. How many days does each leucocyte live? 3. How many erythrocytes are born and die every day?
   

IX. Read Text D and say what data important for a future doctor are given in it. What will you try to remember?


Text D. The Heart Sounds

When we listen to the heart we can heart two sounds. The third sound is also heard in some young persons before the age of 30.

The first heart sound is the longest one. It is heard at the moment of contraction of the ventricles when the atrio-ventricular valves close.
The second sound lasts for a shorter period of time. It is heard at the moment when the pulmonary and aortic semilunar valves close.
The third heart sound is heard when the blood is passing from the atria into the ventricles.
The first and the second cardiac sound are heard over all the portions of the heart and often over the large vessels. The first heart sound is greater over the surface of the ventricles and it is the greatest over the surface of the mitral and tricuspid valves. The second heart sound is heard loudest over the aorta and the pulmonary artery.
Heart sounds are also heard over some portions of the chest. Normally the first heart sound is heard best over the apex of the heart in the fifth costal interspace. The second sound is heard best over the pulmonary artery and the aorta, that is in the second left and right costal interspaces. The aortic sound is normally louder than the pulmonic sound.
The heart sounds are very important in the clinical diagnosis an the doctors determine many cardiac diseases by heart sounds.