Which of the following is true?
Fertilization usually takes place in the uterus.
Women can get pregnant only on the day of ovulation.
Males produce an average of 300 million sperm a day.
Sperm survive for only one day after intercourse
#1 is not true.
#4 is not true.
Check these sites and see what you find.
http://www.homehealth-uk.com/medical/fertilization.htm
http://www.ovulation-calendar.com/hlp-d02-ovulation-and-pregnancy.html
http://wiki.answers.com/Q/What_is_the_average_sperm_count_for_a_man
http://www.babyhopes.com/articles/sperm-survive.html.html
To determine which of the statements is true, we will evaluate each statement one by one:
1. Fertilization usually takes place in the uterus:
To verify this statement, we need to understand the process of fertilization. Fertilization occurs when a sperm cell combines with an egg cell. In humans, fertilization usually occurs in the fallopian tubes rather than the uterus. After fertilization, the fertilized egg travels down to the uterus for implantation. Therefore, this statement is not entirely accurate.
2. Women can get pregnant only on the day of ovulation:
To assess the accuracy of this statement, we need to know about the fertile period in a woman's menstrual cycle. A woman's fertile period includes the days leading up to and including the day of ovulation. Sperm can survive inside the female reproductive system for up to 5 days, so pregnancy can potentially occur from sexual intercourse that takes place a few days before ovulation. However, the egg is only viable for around 12-24 hours after ovulation. Therefore, while the chances of pregnancy are highest on the day of ovulation, it is still possible to conceive a few days before ovulation as well.
3. Males produce an average of 300 million sperm a day:
To verify this statement, we need to explore the process of spermatogenesis. Spermatogenesis is the process by which sperm cells are produced in the testicles. On average, a healthy adult male produces millions of sperm cells each day. The specific number may vary from individual to individual, but 300 million sperm per day is within the typical range. Therefore, this statement is true.
4. Sperm survive for only one day after intercourse:
To assess the accuracy of this statement, we need to understand the lifespan of sperm cells inside the female reproductive system. After ejaculation, sperm can survive inside the fallopian tubes for up to 5 days. This means that if intercourse occurs a few days before ovulation, the sperm can potentially fertilize an egg when it is released. However, once the egg is fertilized or if ovulation does not occur, the lifespan of the sperm is limited to a few days. Therefore, this statement is not entirely accurate.
In summary, the statement that is true is: "Males produce an average of 300 million sperm a day."