Question 1

Which hormone is primarily responsible for stimulating spermatogenesis in the testes, and what is its mechanism of action?

Accepted Answer

Follicle-stimulating hormone (FSH); it binds to Sertoli cells, promoting sperm maturation.

Question 2

A vasectomy is a surgical procedure performed on males. What is the primary purpose and result of this procedure?

Accepted Answer

To cut the vas deferens, preventing sperm from entering the semen and causing infertility.

Question 3

During the ovarian cycle, which hormonal changes trigger ovulation, and what is the physiological effect?

Accepted Answer

A surge in LH causes the mature follicle to release the oocyte.

Question 4

Which anatomical structure is responsible for the union of the oocyte and sperm, and what is the significance of this location?

Accepted Answer

The uterine tube (fallopian tube); it is the typical site of fertilization.

Question 5

Which layer of the uterine wall undergoes cyclical changes during the menstrual cycle, and what is the main reason for these changes?

Accepted Answer

Endometrium; it prepares for potential embryo implantation.

Question 6

A patient presents with erectile dysfunction. Which of the following is a plausible physiological cause?

Accepted Answer

Decreased blood flow to the corpora cavernosa of the penis.

Question 7

Which two cell types are most important for sperm production in the testicles, and what are their functions?

Accepted Answer

Sertoli cells: support and nourish developing sperm; Leydig cells: produce testosterone.

Question 8

Which of the following best describes the difference between sperm and semen?

Accepted Answer

Sperm are the cells responsible for fertilization, while semen is the fluid containing sperm and secretions from accessory glands.

Question 9

During pregnancy, how are the ovarian and uterine cycles affected?

Accepted Answer

The ovarian cycle stops, and the uterine cycle is suppressed to maintain the endometrium.

Question 10

Which hormone is primarily responsible for the development of secondary sexual characteristics in males?

Accepted Answer

Testosterone

Question 11

A couple is concerned about sex-linked inheritance. If the mother is a carrier for an X-linked recessive disorder and the father is unaffected, what is the probability their son will inherit the disorder?

Accepted Answer

50%

Question 12

How many chromosomes are present in a human cell after meiosis II, and what is the term for this chromosome number?

Accepted Answer

23 chromosomes; haploid

Question 13

Which germ layer gives rise to the nervous system during embryonic development?

Accepted Answer

Ectoderm

Question 14

What is the primary function of the chorion during pregnancy?

Accepted Answer

To contribute to the formation of the placenta and facilitate gas exchange

Question 15

Which syndrome is characterized by the presence of an extra X chromosome (47,XXY), and what is a common symptom?

Accepted Answer

Kleinfelter syndrome; reduced fertility and gynecomastia

Question 16

A Punnett square is used to predict the probability of offspring inheriting certain traits. If both parents are heterozygous for a dominant trait (Aa), what is the probability their child will be homozygous recessive (aa)?

Accepted Answer

$$\frac{1}{4}$$

Question 17

During fetal development, which structure is responsible for the initial formation of the heart, and at what stage does this occur?

Accepted Answer

The mesoderm; during the embryonic stage

Question 18

Which of the following best describes the difference between genotype and phenotype?

Accepted Answer

Genotype is the genetic makeup, while phenotype is the observable trait.

Question 19

Which stage of delivery is characterized by the expulsion of the placenta, and what is the clinical significance of this stage?

Accepted Answer

Third stage; it ensures removal of fetal membranes to prevent postpartum complications.

Comprehensive Guidance for ANP Reproductive System & Human Development Exam Study

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