Question 1

Between the seventh and the ninth days after fertilization, __________ occurs.
A) the period of the embryo
B) the period of the fetus
C) implantation
D) cell duplication

Accepted Answer

Between the seventh and ninth days after fertilization, implantation occurs. This is when the fertilized egg burrows into the lining of the uterus and begins to establish a connection with the mother's bloodstream.

Question 2

During the period of the fetus, the
A) developing organism increases rapidly in size.
B) most rapid prenatal changes take place.
C) heart begins to pump blood.
D) brain is formed.

Accepted Answer

During the fetal period, which follows the embryonic period, the developing organism undergoes rapid growth in size and weight, preparing for birth.

Question 3

The placenta is connected to the developing organism by the
A) uterine wall.
B) amnion.
C) chorion.
D) umbilical cord.

Accepted Answer

The umbilical cord connects the fetus to the placenta, which serves as a means of exchanging nutrients, gases, and wastes between the fetus and the mother's blood supply.

Question 4

Lanugo appears over the entire body during the __________ of pregnancy.
A) second month
B) third month
C) second trimester
D) third trimester

Accepted Answer

Lanugo typically appears during the second trimester of pregnancy, around 14-16 weeks gestation. It serves as insulation for the developing fetus and is typically shed before birth.

Question 5

During the third month of pregnancy,
A) the fetus can suck its thumb.
B) tiny buds become arms, legs, fingers, and toes.
C) neuron production begins.
D) the eyes, ears, and nose form.

Accepted Answer

By the third month of pregnancy, the fetus has developed enough to perform actions such as sucking its thumb.

Question 6

The germinal period lasts
A) for about 13 weeks, or a trimester.
B) from fertilization to implantation.
C) for about 6 weeks.
D) from conception to fertilization.

Accepted Answer

The germinal period refers to the first two weeks after fertilization, before implantation occurs. Therefore, the correct answer is B: from fertilization to implantation. Choices A, C, and D are incorrect because they do not accurately reflect the time frame of the germinal period.

Question 7

During the second month of pregnancy, the embryo
A) can be irritated by sounds.
B) has rapid eye movements.
C) responds to touch.
D) shields its eyes in response to light.

Accepted Answer

During the second month of pregnancy, the embryo develops neural pathways that allow it to sense touch. This means it can respond to touch stimuli, indicating that it is sensitive during this stage of development. There is no evidence that the embryo can be irritated by sounds or has rapid eye movements at this stage, and it is unlikely to shield its eyes in response to light as the eyes are not fully developed yet.

Question 8

The thin outer ring of cells on a blastocyst, termed the trophoblast, will become the
A) new organism's skin and hair.
B) structures that provide protective covering and nourishment.
C) embryonic disk.
D) nervous system and skin.

Accepted Answer

The trophoblast layer of cells in a blastocyst will give rise to the structures that provide protective covering and nourishment to the developing embryo, such as the placenta and umbilical cord. It will not become the new organism's skin and hair, the embryonic disk, or the nervous system and skin.

Question 9

The __________ produces blood cells until the developing liver, spleen, and bone marrow are mature enough to take over this function.
A) amnion
B) chorion
C) placenta
D) yolk sac

Accepted Answer

The yolk sac is an embryonic membrane that produces blood cells before the liver, spleen, and bone marrow are fully developed. It also helps with early nourishment of the embryo.

Question 10

The __________ becomes the new organism.
A) embryonic disk
B) trophoblast
C) amnion
D) chorion

Accepted Answer

The embryonic disk, which is formed from the inner cell mass of the blastocyst, becomes the new organism. It gives rise to the three germ layers that eventually differentiate into all the tissues and organs of the developing embryo. The other structures listed (trophoblast, amnion, and chorion) are involved in supporting the development of the embryo/fetus, but they do not become the new organism itself.

Question 11

During Zola's third month of pregnancy, she should
A) be able to feel the baby move.
B) avoid regular exercise.
C) be able to hear the baby's heartbeat through a stethoscope.
D) be able to tell when the baby is alert.

Accepted Answer

During the third month of pregnancy, it is possible to hear the baby's heartbeat through a stethoscope. Feeling the baby move typically occurs later in pregnancy, regular exercise is generally encouraged unless advised otherwise by a healthcare provider, and being able to tell when the baby is alert is not something that can be determined at this stage.

Question 12

Tiny fingerlike villi
A) emerge from the chorion.
B) become the skin.
C) become the nervous system.
D) develop the skeleton.

Accepted Answer

Tiny fingerlike villi emerge from the chorion, which is the outermost fetal membrane. These villi play a crucial role in the exchange of gases, nutrients, and waste products between the maternal and fetal bloodstreams, as they are in direct contact with the mother's blood supply in the uterus.

Question 13

The most rapid prenatal changes take place during the
A) germinal period.
B) period of the fetus.
C) period of the embryo.
D) final trimester.

Accepted Answer

The period of the embryo (which lasts from the 2nd week to the 8th week of gestation) is marked by the most rapid prenatal changes, including the development of major organs and systems, differentiation of the three germ layers, and the formation of the neural tube, which will eventually become the brain and spinal cord.

Question 14

Mel wonders when he will be able to find out the sex of his baby. You tell him that he should be able to detect the sex of the fetus with ultrasound by the __________ week of pregnancy.
A) ninth
B) twelfth
C) fifteenth
D) eighteenth

Accepted Answer

The answer of Mel wonders when he will be able...

Question 15

During her first prenatal visit, LaToya's doctor explains that the __________ prevent(s) the skin from chapping during the long months spent bathing in the amniotic fluid.
A) villi
B) vernix
C) glial cells
D) chorion

Accepted Answer

The vernix is a white, waxy substance that covers the skin of a fetus while in the womb. It helps to protect the skin from chapping and drying out due to constant exposure to the amniotic fluid.

Question 16

Valerie, two months pregnant, wonders how food and oxygen are delivered to the developing organism. You should tell Valerie that the __________ performs this function.
A) chorion
B) amnion
C) placenta
D) neural tube

Accepted Answer

The placenta is an organ that develops during pregnancy and acts as a barrier and exchange site between the mother and developing fetus. It allows for the delivery of nutrients, oxygen, and antibodies to the fetus, and removes waste products such as carbon dioxide. The chorion and amnion are membranes surrounding the fetus, while the neural tube is a structure that develops into the brain and spinal cord.

Question 17

The __________ becomes the nervous system.
A) ectoderm
B) mesoderm
C) endoderm
D) trophoblast

Accepted Answer

The ectoderm layer of cells in the embryo eventually forms the nervous system, including the brain and spinal cord.

Question 18

The amnion
A) develops into the nervous system and the skin.
B) surrounds the chorion.
C) contains one large vein that delivers blood to the developing organism.
D) encloses the developing organism in amniotic fluid.

Accepted Answer

The amnion encloses the developing organism in amniotic fluid, acting as a protective sac.

Question 19

At the beginning of the period of the embryo, the __________ system develops fastest.
A) nervous
B) circulatory
C) digestive
D) skeletal

Accepted Answer

The nervous system develops fastest at the beginning of the embryonic period, guiding the development of other body systems.

Question 20

During the second month of pregnancy, the
A) embryo reacts to light.
B) embryo kicks and bends its arms.
C) heart begins to pump blood.
D) heart develops separate chambers.

Accepted Answer

The answer of During the second month of pregnancy, the
A)...

Quiz 3: Prenatal Development

Between the seventh and the ninth days after fertilization, __________ occurs.

During the period of the fetus, the

The placenta is connected to the developing organism by the

Lanugo appears over the entire body during the __________ of pregnancy.

During the third month of pregnancy,

The germinal period lasts

During the second month of pregnancy, the embryo

The thin outer ring of cells on a blastocyst, termed the trophoblast, will become the

The __________ produces blood cells until the developing liver, spleen, and bone marrow are mature enough to take over this function.

The __________ becomes the new organism.

During Zola's third month of pregnancy, she should

Tiny fingerlike villi

The most rapid prenatal changes take place during the

Mel wonders when he will be able to find out the sex of his baby. You tell him that he should be able to detect the sex of the fetus with ultrasound by the __________ week of pregnancy.

During her first prenatal visit, LaToya's doctor explains that the __________ prevent(s) the skin from chapping during the long months spent bathing in the amniotic fluid.

Valerie, two months pregnant, wonders how food and oxygen are delivered to the developing organism. You should tell Valerie that the __________ performs this function.

The __________ becomes the nervous system.

The amnion

At the beginning of the period of the embryo, the __________ system develops fastest.

During the second month of pregnancy, the