Biology: Chapter 35 Assignment

Which statements about human sexually transmitted diseases are true? Select all that apply.

- STDs can lead to cancer - Antibiotics are used as a treatment for some STDs - STDs can be caused by both protists and fungi

Some female hormonal birth control methods such as birth control pills hold the concentrations of estrogen and progesterone at a moderate level throughout the cycle. Usually, the last seven pills in the pack contain no hormones. How might these contraceptive pills prevent pregnancy? Refer to figure 35.11 and click on all plausible consequences below.

- The endometrium will not fully develop - Ovulation will not occur - LH concentrations will never spike

Select all of the processes that directly involve meiosis.

- spermatogenesis - oogenesis

Two widely accepted criteria for a successful pregnancy are (1) a pregnancy of longer than 37 weeks and (2) a birth weight of more than

5.5 pounds

Review the section "Investigating Life: The Ultimate Sacrifice." What conclusion could be drawn from the data about Australian redback spider sexual cannibalism?

By offering itself up for cannibalism, the male spider increases its chance of success through increased mating time and increased egg fertilization.

Put the following stages in the order that describes the development of a human, beginning at the top with the formation of an egg cell first.

First - Oogenesis - Ovulation - Fertilization - Mitosis of the zygote - Implantation of the blastocyst - Formation of embryo - Formation of fetus - Labor - Birth of newborn Last

Put these human female reproductive structures in the order in which a secondary oocyte will travel through them, beginning at the top with the site of oocyte production and ending at the bottom with the site of expulsion from the body during menstruation. Not all labels will be used.

First - Ovary - Uterine tube - Uterus - Cervix - Vagina Last

Drag these statements describing oogenesis and human reproduction into sequential order.

First - Primary oocyte is produced and stored in the ovaries - FSH and LH stimulate a follicle to mature - Follicles release estrogen - Ovulation occurs - A sperm fertilizes the ovum - A zygote forms Last

Put these human male reproductive structures in the order in which sperm cells travel through them, beginning first at the top with the site of sperm production. Not all labels will be used.

First - Seminiferous tubules - Epididymis - Vas deferens - Ejaculatory duct - Urethra Last

Label female reproductive anatomy in the image below. Not all labels will be used.

From left to right - Uterus - Vagina - Ovary - Uterine tube - Endometrium - Cervix

Label the parts of the male reproductive system in the image below. Not all labels will be used.

From top to bottom. - Seminal Vesicle - Vas deferens - Ejaculatory duct - Urethra - Prostate gland - Epididymis - Testis

After ovulation, one influence of the hormone ______ is to transform the ruptured follicle into a(n) ______, which secretes large amounts of progesterone.

LH; corpus luteum

The images show the stages of the ovarian and menstrual cycles, in addition to line graphs indicating hormone concentrations. Label each hormone and type of cycle.

Top - Produced by anterior pituitary and triggers ovulation - Ovulation - Ovarian cycle - Corpus luteum - Follicle stages - Spike in this hormone triggers surge in LH - Thickening of endometrium - Menstrual cycle

What is at high risk from week 3 through week 16 of a pregnancy?

central nervous system

During which trimester is the fetus at greatest risk?

first trimester

In females, the process that occurs once a month in which one ovary releases a single egg cell is called

ovulation

What label in the diagram above represents the time when human chorionic gonadotropin (hCG) is secreted?

preembryonic

When it is ovulated, the female gamete is at a stage called the

secondary oocyte

What are the products of meiosis I in oogenesis?

secondary oocyte and polar body

During spermatogenesis, which of the following is the first haploid cell?

secondary spermatocyte

Spermatogenesis occurs in the

seminiferous tubules.

During which trimester does the fetus gain the most weight?

third trimester