Q. No.The middle piece of a sperm contains __________.
1. food necessary to nourish the head of the sperm
2. enzymes necessary to penetrate the egg's outer layers
3. mitochondria to provide energy for movement
4. all of the above
1. food necessary to nourish the head of the sperm
2. enzymes necessary to penetrate the egg's outer layers
3. mitochondria to provide energy for movement
4. all of the above
The anterior pituitary secretes gonadotropins:
1. only in females
2. only in males
3. in both males and females
4. only in males, and females after menopause
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The location of ovaries in the human body would most accurately be described as:
| 1. | upper abdominal cavity | 2. | lower thoracic cavity |
| 3. | upper pelvic cavity | 4. | retroperitoneal |
Epithelial linings of the digestive tract is derived from the embryonic:
1. ectoderm
2. mesoderm
3. endoderm
4. allantois
Oxygen rich blood and nutrients are transported to the fetus by:
| 1. | inferior vena cava | 2. | umbilical vein |
| 3. | umbilical artery | 4. | hepatic portal vein |
Within the fetus, much of the circulating blood bypasses the lungs and flows through the ______________.
1. ductus venosus
2. umbilical vein
3. umbilical artery
4. ductus arteriosus
The developing embryo gets implanted on the wall of uterine endometrium at the stage of:
1. gastrula
2. blastocyst
3. morula
4. zygote
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Erythropoiesis in the earliest days of gestation is the function of:
| 1. | yolk sac | 2. | chorion |
| 3. | fetal bone marrow | 4. | amnion |
A second pregnancy during an ongoing pregnancy is prevented by:
| 1. | Estrogen | 2. | HPL |
| 3. | progesterone | 4. | HCG |
The most critical period of gestation where the fetus is most vulnerable to genetic birth defects from drugs taken by the mother is:
| 1. | last trimester | 2. | third to sixth month |
| 3. | first trimester | 4. | a week prior to parturition |
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