Prenatal Development

The time that cells of the zygote first begin differentiating into bone, muscle, nerve, muscle, blood cells.

• day 30

• day 14

• day 21

• day 3

Tags

NGSS.HS-LS1-4

By the end of the ___________, the embryo consists of millions of cells. Eyes, ears, brain, and face form and the heart and nervous system are developing.

• 3rd week

• 1st week

• 8th week

• 4th week

Tags

NGSS.HS-LS1-4

The development of the ___________ establishes reference points for the orientation of the developing embryo.

• Primitive streak
• Epiblast
• Zygote
• Mesoderm

The ectoderm forms the

• Nervous system and skin
• Gastrointestinal system
• Heart and lungs
• Muscles

The mesoderm forms the

• Bones, cartilage and muscles
• Urinary bladder
• Skin
• Glands

The endoderm forms the

• Urinary bladder
• Cardiovascular system
• Kidneys and gonads
• Nervous system

Tags

NGSS.HS-LS1-4

An ectopic pregnancy is

• an embryo implanting in the endometrium

• an embryo implanting in the uterine tube

• one in which the placenta pulls away from the endometrium

• a normal pregnancy

When the blastocyst attaches to the lining of the uterus, this is known as

• fertilization

• ovulation

• implantation

• mensus

What structure protects and cushions the fetus throughout its prenatal development?

• amniotic sac and fluid

• placenta

• umbilical cord

• chorion

In the embryo, heartbeat can first be heard at around 

• 8 days
• 3 weeks
• 6 weeks
• 12 weeks