Question

1. which of the following can cause sterility?*

sexually transmitted diseases
roo little thyroxine
vaginitis
high levels of glucose in the blood

1. the sperm cell and ovum unite to form a zygote in the *

semen
vagina
scrotum
fallopian tubes

1. irritability, weight gain, fatigue, and depression experienced one to two weeks before menstruation are symptoms of

premenstrual syndrome
menstrual cramps
prostate problems
blocked fallopian tubes.

1. sperm are protected from body heat by *

semen
athletic supporters
scrotum
circumcision

Explanation:

• Question 23: Sexually transmitted diseases (STDs) can damage reproductive organs, for example, chlamydia and gonorrhea can cause pelvic inflammatory disease in females which can lead to blocked fallopian tubes (a cause of infertility). Thyroxine deficiency mainly affects metabolism. Vaginitis is an inflammation of the vagina which is usually a short - term infection and not a major cause of sterility. High blood glucose (diabetes - related) can have long - term health effects but is not a direct and common cause of sterility compared to STDs.
• Question 24: Fertilization (sperm - ovum union) occurs in the fallopian tubes. Semen is the fluid that contains sperm. The vagina is the birth canal and the site of sperm deposition. The scrotum is a part of the male reproductive system that holds the testes.
• Question 25: Premenstrual syndrome (PMS) is characterized by symptoms like irritability, weight gain, fatigue, and depression in the 1 - 2 weeks before menstruation. Menstrual cramps are mainly pain during menstruation. Prostate problems affect males. Blocked fallopian tubes are related to fertility issues, not these specific pre - menstrual symptoms.
• Question 26: The scrotum is an external sac that holds the testes. It helps to keep the testes at a temperature lower than the body temperature (which is optimal for sperm production). Semen is the fluid that transports sperm. Athletic supporters are clothing items for support, not a biological structure for temperature regulation. Circumcision is a surgical procedure on the male foreskin and not related to heat protection for sperm.

Answer:

1. sexually transmitted diseases
2. fallopian tubes
3. premenstrual syndrome
4. scrotum