In the absence of fertilization, corpus luteum:

1. Stops secreting progesterone but increases the secretion of estrogen

2. Stops secreting estrogen but increases the secretion of progesterone

3. Increases the secretion of both progesterone and estrogen

4. Degenerates

What ensures that only one sperm can fertilize the ovum?

1. Corona radiata

2. Ground substance around ovum

3. Zona pellucida

4. Acrosome

During pregnancy the levels of thyroxin:

1. Increase several folds in maternal blood

2. Increases several folds in fetal blood

3. Decreases several folds in maternal blood

4. Decreases several folds in fetal blood

The first movements of the fetus and the appearance of hair on the head are usually observed during:

1. 2^nd month

2. 3^rd month

3. 5^th month

4. 6^th month

The milk produced during the initial few days of lactation, called colostrum, is essential for the new born as colostrums contains:

1. Large amount of glucose

2. Anti-infective antibodies

3. Fats

4. Various hormones

All of the following structures are derived from mesoderm except the ____.

1. pancreas

2. dermis of skin

3. notochord

4. heart

Sperm has several components out of which the function of the acrosome is to:

At what point does the secondary oocyte complete meiosis?

1. when acrosomal enzymes begin to break down the egg's jelly coat

2. when the luteinizing hormone triggers ovulation

3 after it is penetrated by a sperm cell

4. when the secondary oocyte implants in the endometrium of the uterus

How do ovulated oocytes get into the uterus?

1. Because ovaries are within the uterus, the ovulated egg is already within the uterus.

2. Cilia within an oviduct create currents that sweep the egg toward the uterus.

3. The oocyte actively swims through the oviduct, using its flagellum.

4. Fimbriae sweep over the oviduct.

Which of the following hormones is not secreted by the human placenta?

1. HCG

2. HGH

3. HPL

4. Progesterone