1. Development of embryo and fetus

The development ___ the mass of cells that will become the infant is called embryogenesis  ___ the first approximately 10 weeks of gestation. During this time, cells begin to differentiate ____ the various body systems. The basic outlines of the organ, body, and nervous systems are established. ____ the end of the embryonic stage, the beginnings ___ features such ___ fingers, eyes, mouth, and ears become visible. Also ____ this time, there is development ____ structures important to the support of the embryo, including the placenta and umbilical cord. The placenta connects the developing embryo ____ the uterine wall to allow nutrient uptake, waste elimination, and gas exchange ___ the mother's blood supply. The umbilical cord is the connecting cord ____ the embryo or fetus to the placenta.

After ____ 10 weeks of gestational age, the embryo becomes known ___ a fetus instead. At the beginning of the fetal stage, the risk ___ miscarriage decreases sharply. When the fetal stage commences, a fetus is typically ____ 30 mm in length, and the heart can be seen beating ____ ultrasound; the fetus can be seen making various involuntary motions ____ this stage.

The fetus continues to grow ____ both weight and length, although the majority of the physical growth occurs ____ the last weeks of pregnancy.

Electrical brain activity is first detected between the 5th and 6th week of gestation. Synapses begin forming ____ 17 weeks, and at about week 28 begin to multiply at a rapid pace which continues _____ 3 to 4 months after birth.

Grammar in Use Conditional Sentences

Conditional clause	Main clause
If, when, unless, as soon as + Present Simple	Future Simple
If I have time,	I will read about treatment of hypertension.
When the lesson is over,	he will call you at once.
Unless the students understand,	they will raise their hands to ask.
As soon as the patient is admitted to the hospital,	the doctor will examine him.

Exercise 11. Open the brackets. Put the verb in the correct tense form.

1. If the nurse (to have) time, she (to make) an X-ray.

2. If you (to take) regular exercises, you (to feel) healthy.

3. When the doctor (to free), he (to examine) your child.

4. When the person (not to want) to the doctor with mild symptoms, he (to have) severe problems later.

5. The infant (to be fed) artificially, unless the mother’s health (to be restored).

6. If red blood cell count (to decrease), the patient (to require) additional treatment.

7. The blood supply of the lung (to be restored), as soon as the consolidation in it (to disappear).

8. The patient (to be allowed) to sit, if the heartbeat (to become) normal.

Exercise 12. Correct the mistakes if necessary.

1. You will receive a sick-leave, if you will have high temperature.

2. We know the disease, as soon as the doctor makes diagnosis.

3.  The nurse will give you the injection of antibiotics, when the doctor administrates them.

4. If the inflammation process will begin, we will call in a doctor.

5. The nurse fills in the patient card when she takes the temperature.

6. If she do not go to the dentist, she will have terrible toothache.

Exercise 13. Put questions to the underlined words.

1. The reproductive system is a collection of organs that work together for the purpose of producing a new life. 

2. Substances such as fluids, hormones, and pheromones are also important to the effective functioning of the reproductive system.

3. The genes that parents pass along to their children are what make children similar to others in their family.

4. There are many parts of the male and female reproductive systems that can be affected by cancer.

5. Pregnancy is the time a mother carries the baby from conception until birth.

6. When the baby is ready to be born, its head presses against the cervix which then relaxes.

7. The entire male reproductive system is dependent on hormones.

8. Human reproduction is a delicate bio-chemical process, guided at every step by powerful hormones.