1. Put the verbs into the Simple Past Tense.1. I am tired but I can’t sleep. 2. It is a nice hotel room; you can see the mountains from the window. 3. The Smiths have a nice house but it has no garden. 4. Can you go to the concert with Kelly? 5. We are so hungry but we have no time to eat. 6. Tom is not busy, he can help you. 7. I have some news for Martin but I can’t find him. 8. The manager cannot decide what to do; he has so many problems. 9. It is late and the children are in bed. 10. George isn’t at work today as he is ill. 11. They usually have walks in the evenings. 12. Can you give me a glass of water, please?​

1. The three layers of the heart are the epicardium, the myocardium and the endocardium.
2. The four chambers of the heart are: the right atrium, the right ventricle, the left atrium, and the left ventricle.
3.There are four valves in the heart: the atrioventricular valves (lie between the atria and the ventricles); the bicuspid or mitral valve (located on the left side of the heart); the tricuspid valve (located on the right side of the heart); the pulmonic semilunar valve (lies between the right ventricle and the pulmonary artery) and the aortic semilunar valve (lies between the left ventricle and the aorta). 
4.Pulmonic circulation deals with deoxygenatrd blood, but the systemic with oxygenates blood.
5.It consists of sympathetic and parasympathetic nervous system. 
6.The normal heart rate is 60 to 80 beats per minute.
7.The normal blood pressure is 120mm Hg for the systolic blood pressure and 80mm Hg for the diastolic blood pressure.
8. These are the types types of vessels: arteries, arterioles, capillaries, venules, veins.

1.True.
2.False, it receives oxygenated blood.
3.True
4.True
5.True

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