Question

The heart is located in the __. It has four __: two ___ and two___. A partition which is called___ separates the chambers. The wall of the heart consists of three ____: ___ which is the inner layer, __ which is the muscular layer and __ , the outer layer. The heart is surrounded by the ___. The two phases of the heartbeat are termed __ and ___. __ is the phase of relaxation, ___ is the phase of contraction.

Answer 1

Ответ:

The heart is located in the **chest**. It has four **chambers**: two **atria** and two **ventricles**. A partition which is called the **septum** separates the chambers. The wall of the heart consists of three **layers**: **endocardium** which is the inner layer, **myocardium** which is the muscular layer, and **epicardium**, the outer layer. The heart is surrounded by the **pericardium**. The two phases of the heartbeat are termed **diastole** and **systole**. **Diastole** is the phase of relaxation, **systole** is the phase of contraction.