Ejercicios posibles en ingles

HUMAN REPRODUCTION QUESTIONS
Complete each of the following questions on your own paper. Use complete sentences when forming your responses.
1.    What is the male gamete?
2.    Where does sperm cell formation occur?
3.    What is the function of the sac the testes are suspended in, the scrotum?
4.    What is the process of gametogenesis? 
5.    What is spermatogenesis?
6.    What iscontained in the epididymis and what happens to them there?
7.    What does the vas deferens do?
8.    What is semen made up of (be specific as to its complete composition)?
9.    What structure had specifically evolved in humans to deposit sperm inside the
        female body internally?
10.   What is ejaculation? 
11.   Where are egg cells produced in the human female? 
12.   What is anovarian follicle? 
13.   Where does fertilization of the egg usually occur in the human female?
14.    Describe the appearance of the uterus.  What develops there? 
15.   What happens to the egg cell if fertilization and implantation of the developing
        embryo on the uterus does not occur? 
16.   What is puberty?
17.  What is in vitro fertilization?  Why might a couple attempt this? 
Usethe diagram below and your knowledge of biology to answer questions 18 through 20 which follow.
[pic]
18.   Identify each of the structures in the male and female reproductive systems pictured above..
19.   What would be the effect of cutting and tying off structure D?   Structure H?
20.   What other contraceptive methods do you know?

ANSWERS
1. The male gamete is the sperm cell.
2. Thesperm cell is formed in the seminiferous tubules inside the testis.
3. Testes are suspended outside the abdominal cavity by the scrotum, a pouch of skin that keeps the testes close or far from the body at an optimal temperature for sperm development; a  temperature slightly lower than that of the rest of the body. For human beings, the temperature should be one or two degrees Celsius below bodytemperature (37ºC). Higher temperatures may be damaging to sperm count.
The temperature is controlled by the scrotum moving the testicles closer to the abdomen when the ambient temperature is cold, and further away when it is hot.
4. Gametogenesis is the development and production of the male and female germ cells required to form a new individual.
The gametes in human males are produced bythe testes. Male gametes are called sperm cells. Gametes in human females are produced by the ovaries, and they are called egg cells, ovules or ova.
5. Spermatogenesis is the process of producing sperm with half the number of chromosomes as somatic cells (the rest of the cells of the body). In humans the body cells have 46 chromosomes, while the gametes have 23.

Spermatogenesis occurs in theseminiferous tubules inside the testes, (male gonads).

Before becoming sperm cells (mature gametes) they follow some stages: First they are called spermatocytes that inside the tubules divide by meiosis (reduction the number of chromosomes to a half) to produce spermatids that in turn develop into mature sperm. It takes about 72 days for one sperm to grow.
6. The Epididymis is a structurewithin the scrotum attached to the backside of the testis. The epididymis is a coiled segment of the spermatic ducts that serves to store, mature and transport spermatozoa between the testis and the vas deferens.
7. The vas deferens is a coiled (enrollado) duct that carries sperm from the epididymis to the ejaculatory duct and the urethra.
8. Semen is the cloudy white body fluid that is emittedfrom the urethra of the penis during ejaculation.
Most of the fluid in semen is made up of secretions from male reproductive organs.
• 65 per cent of the fluid is produced by the seminal vesicles
• 30 to 35 per cent by the prostate
• 5 per cent from the testicles and epididymes
• 2 to 5 % from the bulbourethral and urethral glands

Semen contains citric acid, free amino acids,...